...is a weblog about the liberal arts 2.0 edited by Jason Kottke since March 1998 (archives). You can read about me and kottke.org here. If you've got questions, concerns, or interesting links, send them along.
The Scale of the Universe 2 is an interactive Powers of Ten that takes you from the Planck length all the way up to the size of the observable Universe. That's more than 60 orders of magnitude! Also interesting that the smallest things (Planck length, strings, branes) are millions of times smaller compared to human scale than the observable Universe is larger. Plenty of room at the bottom indeed.
In this transcript of a talk given to the attendees of the Joint Summits on Translational Science, Carl Zimmer highlights an important aspect of understanding the human body and how to treat its many maladies: the ecosystem of microbes.
The microbes in your body at this moment outnumber your cells by ten to one. And they come in a huge diversity of species -- somewhere in the thousands, although no one has a precise count yet. By some estimates there are twenty million microbial genes in your body: about a thousand times more than the 20,000 protein-coding genes in the human genome. So the Human Genome Project was, at best, a nice start. If we really want to understand all the genes in the human body, we have a long way to go.
Now you could say "Who cares? They're just wee animalcules." Those wee animacules are worth caring about for many reasons. One of the most practical of those reasons is that they have a huge impact on our "own" health. Our collection of microbes-the microbiome-is like an extra organ of the human body. And while an organ like the heart has only one function, the microbiome has many.
When food comes into the gut, for example, microbes break some of them down using enzymes we lack. Sometimes the microbes and our own cells have an intimate volley, in which bacteria break down a molecule part way, our cells break it down some more, the bacteria break it down even more, and then finally we get something to eat.
Another thing that the microbiome does is manage the immune system. Certain species of resident bacteria, like Bacteroides fragilis, produce proteins that tamp down inflammation. When scientists rear mice that don't have any germs at all, they have a very difficult time developing a normal immune system. The microbiome has to tutor the immune system in how to do its job properly. It also acts like an immune system of its own, fighting off invading microbes, and helping to heal wounds.
While the microbiome may be an important organ, it's a peculiar one. It's not one solid hunk of flesh. It's an ecosystem, made up of thousands of interacting species.
Scott Carpenter was one of the original seven Mercury astronauts and the second American to orbit the Earth. Just before he went into space, his father wrote this wonderful letter.
And I venture to predict that after all the huzzas have been uttered and the public acclaim is but a memory, you will derive the greatest satisfaction from the serene knowledge that you have discovered new truths. You can say to yourself: this I saw, this I experienced, this I know to be the truth. This experience is a precious thing; it is known to all researchers, in whatever field of endeavour, who have ventured into the unknown and have discovered new truths.
I don't know if the nudie playing cards are absolutely essential, but this trick is pretty neat.
(via @itscolossal)
The standard measure for the kilogram needs to change because, offically speaking, the universe is gaining mass. The trick is finding a technique that ties the kilogram to a fundamental constant (like the second is tied to energy transition times in cesium atoms).
Familiarly known as Le Grand K and held in a vault just outside of Paris under three bell jars, [the international prototype kilogram] dates back to the 1880s, when it was forged by the British metallurgist George Matthey from an alloy of nine-tenths platinum and one-tenth iridium. As a metric unit, the kilogram is "equal to the mass of the international prototype," according to the official definition. In other words, as metrologists like to point out, it has the remarkable property of never gaining or losing mass. By definition, any physical change to it alters the mass of everything in the cosmos.
Aside from a yearly ceremonial peek inside its vault, which can be unlocked only with three keys held by three different officials, the prototype goes unmolested for decades. Yet every 40 years or so, protocol requires that it be washed with alcohol, dried with a chamois cloth, given a steam bath, allowed to air dry, and then weighed against the freshly scrubbed national standards, all transported to France. It is also compared to six temoins (witnesses), nominally identical cylinders that are stored in the vault alongside the prototype. The instruments used to make these comparisons are phenomenally precise, capable of measuring differences of 0.0000001 percent, or one part in 1 billion. But comparisons since the 1940s have revealed a troublesome drift. Relative to the t'emoins and to the national standards, Le Grand K has been losing weight -- or, by the definition of mass under the metric system, the rest of the universe has been getting fatter. The most recent comparison, in 1988, found a discrepancy as large as five-hundredths of a milligram, a bit less than the weight of a dust speck, between Le Grand K and its official underlings.
The sound and picture are poor, but the entirety of Errol Morris' A Brief History of Time is available on YouTube.
Featuring music from Philip Glass, the film is a documentary about Stephen Hawking and his ideas about the universe. Morris recently stated on Twitter:
Yes. I plan to re-release [A Brief History of Time]. (It was never properly color corrected and is one of my best films.)
The film is difficult, if not impossible, to find on DVD and isn't available on Netflix, Amazon Instant Video, or iTunes. And as far as I can tell, the soundtrack was never released either.
During pregnancy, the mother and fetus exchange cells and some of those cells can live on forever in the two bodies after the child is born.
During pregnancy, cells sneak across the placenta in both directions. The fetus's cells enter his mother, and the mother's cells enter the fetus. A baby's cells are detectable in his mother's bloodstream as early as four weeks after conception, and a mother's cells are detectable in her fetus by week 13. In the first trimester, one out of every fifty thousand cells in her body are from her baby-to-be (this is how some noninvasive prenatal tests check for genetic disorders). In the second and third trimesters, the count is up to one out of every thousand maternal cells. At the end of the pregnancy, up to 6 percent of the DNA in a pregnant woman's blood plasma comes from the fetus. After birth, the mother's fetal cell count plummets, but some stick around for the long haul. Those lingerers create their own lineages. Imagine colonies in the motherland.
Moms usually tolerate the invasion. This is why skin, organ, and bone marrow transplants between mother and child have a much higher success rate than between father and child.
Whoa.
The quantum levitation videos I showed you a couple months ago are pretty cool, but scientists scienticiens at the Japan Institute of Science and Technology have upped the game by using QL CGI to build a real-world Wipeout track.
Say it with me: science!! Also, do Rainbow Road next! (via ★interesting)
Update: Say it with me: advertising! Or some other such nonsense. Several people have alerted me that this video is a fake...you can see vapor trails passing through walls, etc. Boo. Boo-urns. (thx, all)
From New Scientist, a list of eight different ways to lose weight that actually work. Because science!
If your idea of a holiday workout is lifting glasses of beer late into the night, then it's not just the extra calories you need to worry about. Randy Nelson and his team at Ohio State University in Columbus found that mice exposed to light at night weighed 10 per cent more at the end of the eight-week study than mice that had experienced a standard light/dark cycle, even though they ate the same total number of calories and did the same amount of exercise.
(via @daveg)
A thick black fungus growing near a whiskey distillery warehouse in Ontario prompted mycologist James Scott to track the fungus all the way back to its discovery in France in 1881.
When he arrived at the warehouse, the first thing he noticed (after "the beautiful, sweet, mellow smell of aging Canadian whiskey," he says) was the black stuff. It was everywhere -- on the walls of buildings, on chain-link fences, on metal street signs, as if a battalion of Dickensian chimney sweeps had careened through town. "In the back of the property, there was an old stainless steel fermenter tank," Scott says. "It was lying on its side, and it had this fungus growing all over it. Stainless steel!" The whole point of stainless steel is that things don't grow on it.
If you drop a bunch of neodymium magnets down through a thick-walled copper pipe, an effect called eddy current braking will slow the magnets' fall even though there's no direct magnetic attraction between the copper and the magnets.
Science! (via make)
From Penn Jillette's book, God, No!: Signs You May Already Be an Atheist and Other Magical Tales:
There is no god and that's the simple truth. If every trace of any single religion died out and nothing were passed on, it would never be created exactly that way again. There might be some other nonsense in its place, but not that exact nonsense. If all of science were wiped out, it would still be true and someone would find a way to figure it all out again.
(via mlkshk)
College-age women end sentences in the lowest vocal register, a creaky vibration called vocal fry, possibly to broadcast themselves as part of a social group.
Vocal fry...great term! Here's a demo of how the effect is used in singing.
Update: About a minute into this clip from Louie, there's a great example of vocal fry used by "college-age women [to] end sentences":
(via @dalton)
At the beginning of this video, Ramesh Raskar, associate professor at the MIT Media Lab, announces calmly:
We have built a virtual slow-motion camera where we can see photons, or light particles, moving through space.
Yeah, no biggie.
Russian scientists are seeing dramatically increased levels of methane coming from melting permafrost in the East Siberian Ice Shelf. If enough methane is released, that could really put a foot on the gas pedal with this whole global warming thing.
"Earlier we found torch-like structures like this but they were only tens of metres in diameter. This is the first time that we've found continuous, powerful and impressive seeping structures, more than 1,000 metres in diameter. It's amazing," Dr Semiletov said. "I was most impressed by the sheer scale and high density of the plumes. Over a relatively small area we found more than 100, but over a wider area there should be thousands of them."
Scientists estimate that there are hundreds of millions of tonnes of methane gas locked away beneath the Arctic permafrost, which extends from the mainland into the seabed of the relatively shallow sea of the East Siberian Arctic Shelf. One of the greatest fears is that with the disappearance of the Arctic sea-ice in summer, and rapidly rising temperatures across the entire region, which are already melting the Siberian permafrost, the trapped methane could be suddenly released into the atmosphere leading to rapid and severe climate change.
Elephants were the "perfect food package" for pre-human hominids (they were slow with a good fat-to-protein ratio) and their extinction in the Middle East (and Africa) caused those hominids to evolve to be more like modern humans.
When elephants began to die out, Homo erectus "needed to hunt many smaller, more evasive animals. Energy requirements increased, but with plant and protein intake limited, the source had to come from fat. He had to become calculated about hunting," Ben-Dor says, noting that this change is evident in the physical appearance of modern humans, lighter than Homo erectus and with larger brains.
(via @daveg)
Rumor has it that the LHC at CERN has found the Higgs boson. The news runs contrary to some earlier speculation.
The teams are sworn to secrecy, but various physics blogs, and the canteens at Cern, are alive with talk of a possible sighting of the Higgs, and with a mass inline with what many physicists would expect.
Since the Higgs' nickname is the God particle, does this count as the Second Coming? (@gavinpurcell)
From Sean Carroll at Cosmic Variance, a list of facts and very strong opinions about the nature of time.
4. You live in the past. About 80 milliseconds in the past, to be precise. Use one hand to touch your nose, and the other to touch one of your feet, at exactly the same time. You will experience them as simultaneous acts. But that's mysterious - clearly it takes more time for the signal to travel up your nerves from your feet to your brain than from your nose. The reconciliation is simple: our conscious experience takes time to assemble, and your brain waits for all the relevant input before it experiences the "now." Experiments have shown that the lag between things happening and us experiencing them is about 80 milliseconds.
5. Your memory isn't as good as you think. When you remember an event in the past, your brain uses a very similar technique to imagining the future. The process is less like "replaying a video" than "putting on a play from a script." If the script is wrong for whatever reason, you can have a false memory that is just as vivid as a true one. Eyewitness testimony, it turns out, is one of the least reliable forms of evidence allowed into courtrooms.
A recently discovered species of crab grows gardens of bacteria on its claws on which to feed.
The bristles that cover the crab's claws and body are coated in gardens of symbiotic bacteria, which derive energy from the inorganic gases of the seeps. The crab eats the bacteria, using comb-like mouthparts to harvest them from its bristles. [...] Thurber thinks that K. puravida waves its claws to actively farm its bacterial gardens: movements stir up the water around the bacteria, ensuring that fresh supplies of oxygen and sulphide wash over them and helping them to grow. "This 'dance' is extraordinary and comical," says Van Dover. "We've never seen this strategy before."
(via @noahwg)
80-minute video of a conversation between Neil deGrasse Tyson and of an out-of-character Stephen Colbert "about science, society, and the universe". Someone needs to get this on YouTube or something...the video streaming is slooooow.
Update: Ah, here's a mirror on YouTube. (thx, aaron)
When dense briny water (left behind by newly formed sea ice) sinks, it freezes the water around it, forming an icicle that stretches to the sea floor. Then it freezes water and wildlife on the sea floor. David Attenborough narrates:
Here's an interesting hypothesis: that all current life on Earth originated from a planet-wide super-organism named LUCA.
The latest results suggest LUCA was the result of early life's fight to survive, attempts at which turned the ocean into a global genetic swap shop for hundreds of millions of years. Cells struggling to survive on their own exchanged useful parts with each other without competition -- effectively creating a global mega-organism.
It was around 2.9 billion years ago that LUCA split into the three domains of life: the single-celled bacteria and archaea, and the more complex eukaryotes that gave rise to animals and plants (see timeline). It's hard to know what happened before the split. Hardly any fossil evidence remains from this time, and any genes that date that far back are likely to have mutated beyond recognition.
(via @daveg)
What the what? This video gives a little more explanation into the effect at work here (superconductivity + quantum trapping of the magnetic field in quantum flux tubes) and an awesome demonstration of a crude rail system. You can almost hear your tiny mind explode when the "train" goes upside-down.
Wingardium Leviosa! (via stellar)
In a 2008 paper called The Seductive Allure of Neuroscience Explanations, a group from Yale University demonstrated that including neuroscientific information in explanations of psychological phenomena makes the explanations more appealing, even if the neuroscientific info is irrelevant.
Explanations of psychological phenomena seem to generate more public interest when they contain neuroscientific information. Even irrelevant neuroscience information in an explanation of a psychological phenomenon may interfere with people's abilities to critically consider the underlying logic of this explanation.
I don't know if I buy this. Perhaps if the authors had explained their results relative to how the human brain functions...
Richard Feynman talking about the beauty of science and of the natural world over a bunch of video footage taken from NASA, Microcosmos, and BBC nature docs like Planet Earth? This is fantastically right up my alley.
Part two is Honours and part three is Curiosity. If I ever go on hallucinogenic walkabout in the desert, I'd want Richard Feynman to be my spirit animal. (via ★interesting)
Why do riderless bicycles not fall over? Science Friday looks at the science behind bike self-steering.
(via robottke!)
This is incredible...researchers at Berkeley have developed a system that reads people's minds while they watch a video and then roughly reconstructs what they were watching from thousands of hours of YouTube videos. This short demo shows how it works:
Nishimoto and two other research team members served as subjects for the experiment, because the procedure requires volunteers to remain still inside the MRI scanner for hours at a time.
They watched two separate sets of Hollywood movie trailers, while fMRI was used to measure blood flow through the visual cortex, the part of the brain that processes visual information. On the computer, the brain was divided into small, three-dimensional cubes known as volumetric pixels, or "voxels."
"We built a model for each voxel that describes how shape and motion information in the movie is mapped into brain activity," Nishimoto said.
The brain activity recorded while subjects viewed the first set of clips was fed into a computer program that learned, second by second, to associate visual patterns in the movie with the corresponding brain activity.
Brain activity evoked by the second set of clips was used to test the movie reconstruction algorithm. This was done by feeding 18 million seconds of random YouTube videos into the computer program so that it could predict the brain activity that each film clip would most likely evoke in each subject.
Finally, the 100 clips that the computer program decided were most similar to the clip that the subject had probably seen were merged to produce a blurry yet continuous reconstruction of the original movie.
The kicker: "the breakthrough paves the way for reproducing the movies inside our heads that no one else sees, such as dreams and memories". First time travelling neutrinos and now this...what a time to be alive. (via ★essl)
Physicists at CERN believe they have observed neutrinos moving at speeds faster than the speed of light, a feat previously assumed to be impossible.
Thousands of experiments have been undertaken to measure it ever more precisely, and no result has ever spotted a particle breaking the limit.
But Dr Ereditato and his colleagues have been carrying out an experiment for the last three years that seems to suggest neutrinos have done just that.
Neutrinos come in a number of types, and have recently been seen to switch spontaneously from one type to another.
The team prepares a beam of just one type, muon neutrinos, sending them from Cern to an underground laboratory at Gran Sasso in Italy to see how many show up as a different type, tau neutrinos.
In the course of doing the experiments, the researchers noticed that the particles showed up 60 billionths of a second sooner than light would over the same distance.
This is a tiny fractional change, but one that occurs consistently.
The team measured the travel times of neutrino bunches some 15,000 times, and have reached a level of statistical significance that in scientific circles would count as a formal discovery.
If true, saying this is a significant discovery is a doubly significant understatement.
Most of the possible masses for the Higgs boson (aka the God particle) have been eliminated with at a 95% confidence level by physicists at CERN. They're checking the other masses and will likely have an answer one way or the other in December.
"We are now entering a very exciting phase in the hunt for the Higgs boson," Sharma said. "If the Higgs boson exists between 114-145 GeV, we should start seeing statistically significant excesses over estimated backgrounds, and if it does not then we hope to rule it out over the entire mass range. One way or the other we are poised for a major discovery, likely by the end of this year."
(via @daveg)
Dinosaur feathers have been found preserved in amber, Jurassic Park-style.
Dinosaur and bird feathers preserved in amber from a Late Cretaceous site in Canada reveal new insights into the structure, function, and color of animals that date back to about 78 million years ago.
Researchers led by University of Alberta paleontologist Ryan McKellar say these specimens represent distinct stages of feather evolution, from early-stage, single filament protofeathers to much more complex structures associated with modern diving birds. After analyzing the preserved pigment cells, the authors add that these feathered creatures may have also had a range of transparent, mottled, and diffused colors, similar to birds today. They can't determine which feathers belonged to birds or dinosaurs yet, but they did observe filament structures that are similar to those seen in other non-avian dinosaur fossils. Their findings appear in the current issue of the journal Science.
Click through for a slideshow of photos.
This crazy-experimental therapy uses a modified HIV virus to attack cancer cells in humans. Only three people have tried this therapy for chronic lymphocytic leukemia; two are in complete remission and one showed improvement.
Doctors removed a billion of his T-cells -- a type of white blood cell that fights viruses and tumors -- and gave them new genes that would program the cells to attack his cancer. Then the altered cells were dripped back into Mr. Ludwig's veins.
At first, nothing happened. But after 10 days, hell broke loose in his hospital room. He began shaking with chills. His temperature shot up. His blood pressure shot down. He became so ill that doctors moved him into intensive care and warned that he might die. His family gathered at the hospital, fearing the worst.
A few weeks later, the fevers were gone. And so was the leukemia.
There was no trace of it anywhere -- no leukemic cells in his blood or bone marrow, no more bulging lymph nodes on his CT scan. His doctors calculated that the treatment had killed off two pounds of cancer cells.
A year later, Mr. Ludwig is still in complete remission. Before, there were days when he could barely get out of bed; now, he plays golf and does yard work.
(via @marcprecipice)
You know how your hands and feet get all wrinkly when they're immersed in water for a long time? There's speculation the wrinkles might be an adaptation that allows for better gripping in wet conditions.
Now a paper in the journal Brain, Behavior and Evolution offers more evidence that wet wrinkles serve a purpose. Much like the tread on a tire, they improve traction.
In the study, an evolutionary neurobiologist and his co-authors examined 28 fingers wrinkled by water. They found that they all had the same pattern of unconnected channels diverging away from one another as they got more distant from the fingertips.
The wrinkles allow water to drain away as fingertips are pressed to wet surfaces, creating more contact and a better grip.
(via stellar)
The Cassini spacecraft caught this remarkable photo of Saturn eclipsing the Sun in 2006.
Click through for the big image and the massive image. If you look close can see the Earth in the image, for reals!
The giants of physics (and Morgan Freeman, who can be a giant of anything he wants) explain quantum mechanics using relatively simple terms and autotune.
(via devour)
From late last week, news that NASA's Mars Reconnaissance Orbiter has found possible evidence that there's flowing water on Mars.
Dark, finger-like features appear and extend down some Martian slopes during late spring through summer, fade in winter, and return during the next spring. Repeated observations have tracked the seasonal changes in these recurring features on several steep slopes in the middle latitudes of Mars' southern hemisphere.
"The best explanation for these observations so far is the flow of briny water," said Alfred McEwen of the University of Arizona, Tucson. McEwen is the principal investigator for the orbiter's High Resolution Imaging Science Experiment (HiRISE) and lead author of a report about the recurring flows published in Thursday's edition of the journal Science.
This is a bit of a head-scratcher...the guy behind the Family Guy (Seth MacFarlane) is teaming up with Carl Sagan's widow and Neil DeGrasse Tyson to do a sequel to the landmark science series, Cosmos. The series will air in primetime on Fox.
The producers of the show say the new series will tell "the story of how human beings began to comprehend the laws of nature and find our place in space and time." They go on to boast: "It will take viewers to other worlds and travel across the universe for a vision of the cosmos on the grandest scale. The most profound scientific concepts will be presented with stunning clarity, uniting skepticism and wonder, and weaving rigorous science with the emotional and spiritual into a transcendent experience."
I'll be tuning in but will be pleasantly surprised if it does well in the ratings or is any good.
Evolutionary biologists are increasingly studying organisms (like mice, fish, and bacteria) in urban areas like New York City to find out how they evolve to urban conditions.
Dr. Munshi-South and his colleagues have been analyzing the DNA of the mice. He's been surprised to find that the populations of mice in each park are genetically distinct from the mice in others. "The amount of differences you see among populations of mice in the same borough is similar to what you'd see across the whole southeastern United States," he said.
Using a modified iPhone and a fluorescing nanoparticle tattoo, researchers at Northeastern University have found a way to monitor chemicals in the blood without drawing blood.
The team begins by injecting a solution containing carefully chosen nanoparticles into the skin. This leaves no visible mark, but the nanoparticles will fluoresce when exposed to a target molecule, such as sodium or glucose. A modified iPhone then tracks changes in the level of fluorescence, which indicates the amount of sodium or glucose present. Clark presented this work at the BioMethods Boston conference at Harvard Medical School last week.
The tattoos were originally designed as a way around the finger-prick bloodletting that is the standard technique for measuring glucose levels in those with diabetes. But Clark says they could be used to track many things besides glucose and sodium, offering a simpler, less painful, and more accurate way for many people to track many important biomarkers.
Recent analysis of some Viking bones suggests that women were a significant part of the Viking settlement of England around 900 A.D.
So, the study looked at 14 Viking burials from the era, definable by the Norse grave goods found with them and isotopes found in their bones that reveal their birthplace. The bones were sorted for telltale osteological signs of which gender they belonged to, rather than assuming that burial with a sword or knife denoted a male burial.
Overall, McLeod reports that six of the 14 burials were of women, seven were men, and one was indeterminable. Warlike grave goods may have misled earlier researchers about the gender of Viking invaders, the study suggests. At a mass burial site called Repton Woods, "(d)espite the remains of three swords being recovered from the site, all three burials that could be sexed osteologically were thought to be female, including one with a sword and shield," says the study.
I'm slowly working my way through Charles Mann's 1493 and there are interesting tidbits on almost every page. One of my favorite bits of the book so far is a possible explanation of the Little Ice Age that I hadn't heard before put forth by William Ruddiman.
As human communities grow, Ruddiman pointed out, they open more land for farms and cut down more trees for fuel and shelter. In Europe and Asia, forests were cut down with the ax. In the Americas before [Columbus], the primary tool was fire. For weeks on end, smoke from Indian bonfires shrouded Florida, California, and the Great Plains.
Burning like this happened all over the pre-Columbian Americas, from present-day New England to Mexico to the Amazon basin to Argentina. Then the Europeans came:
Enter now the Columbian Exchange. Eurasian bacteria, viruses, and parasites sweep through the Americas, killing huge numbers of people -- and unraveling the millenia-old network of human intervention. Flames subside to embers across the Western Hemisphere as Indian torches are stilled. In the forests, fire-hating trees like oak and hickory muscle aside fire-loving species like loblolly, longleaf, and slash pine, which are so dependent on regular burning that their cones will only open and release seed when exposed to flame. Animals that Indians had hunted, keeping their numbers down, suddenly flourish in great numbers. And so on.
The regular fires and forest regrowth resulted in less carbon dioxide in the atmosphere and the atmosphere traps less heat. It's like global warming in reverse.
There is evidence that modern humans mating with Neanderthals helped humans spread out of Africa to distant parts of the globe.
While only 6 per cent of the non-African modern human genome comes from other hominins, the share of HLAs acquired during interbreeding is much higher. Half of European HLA-A alleles come from other hominins, says Parham, and that figure rises to 72 per cent for people in China, and over 90 per cent for those in Papua New Guinea.
This suggests they were increasingly selected for as H. sapiens moved east. That could be because humans migrating north would have faced fewer diseases than those heading towards the tropics of south-east Asia, says Chris Stringer of the Natural History Museum in London.
LeafSnap is a new iPhone app that uses facial recognition techniques to identify trees based on photos of their leaves.
Leafsnap contains beautiful high-resolution images of leaves, flowers, fruit, petiole, seeds, and bark. Leafsnap currently includes the trees of New York City and Washington, D.C., and will soon grow to include the trees of the entire continental United States.
Wow. Garden Design has more info. (thx, claire)
Mesmerizing video of a series of pendulums moving in an out of sync with each other until at the end...well, I won't spoil it.
(thx, john)
Whoa, watch the video at the top of this article to see how the human face develops in the womb from an age of one-month to ten weeks. It all just comes together right at the end!
If you watch it closely, you will see that the human face is actually formed of three main sections which rotate and come together in an unborn foetus.
The way this happens only really makes sense when you realise that, strange though it may sound, we are actually descended from fish.
The early human embryo looks very similar to the embryo of any other mammal, bird or amphibian -- all of which have evolved from fish.
Your eyes start out on the sides of your head, but then move to the middle.
The top lip along with the jaw and palate started life as gill-like structures on your neck. Your nostrils and the middle part of your lip come down from the top of your head.
There is no trace of a scar; the plates of tissue and muscle fuse seamlessly. But there is, however, a little remnant of all this activity in the middle of your top lip -- your philtrum.
(via hypertext)
NASA's just finished an impressive experiment designed to test Einstein's general theory of relativity -- specifically the "mass distorts spacetime" part:
Put a spinning gyroscope into orbit around the Earth, with the spin axis pointed toward some distant star as a fixed reference point. Free from external forces, the gyroscope's axis should continue pointing at the star--forever. But if space is twisted, the direction of the gyroscope's axis should drift over time. By noting this change in direction relative to the star, the twists of space-time could be measured.
Gravity Probe B's experiment was 47 years in the making, helped spawn 100 PhD theses, and required the invention of 13 brand-new technologies, including a "drag-free satellite." The four gyroscopes in GP-B are "the most perfect spheres ever made by humans... If the gyroscopes weren't so spherical, their spin axes would wobble even without the effects of relativity."
NASA finished collecting the data in 2005; now they've crunched the numbers. And yes, Einstein was right. The gyroscopes wobble in just the way general relativity predicts.
The first and most famous empirical experiment testing Einstein's theory was performed in 1919 by Arthur Eddington during a full solar eclipse. Photographs showed that the sun's mass caused starlight to bend around it.
(Image by James Overduin, Pancho Eekels, and Bob Kahn via NASA.)
Paul May keeps track of the dozens of molecules that have unusual names. Like moronic acid, betweenanene, and draculin:
Draculin is the anticoagulant factor in vampire bat saliva. It is a large glycoprotein made from a sequence of 411 amino acids.
(via prosthetic knowledge)
Seed Magazine asked a number of thinkers to provide statements about their respective fields containing "the most information in the fewest words" a la Richard Feynman:
If, in some cataclysm, all of scientific knowledge were to be destroyed, and only one sentence passed on to the next generations of creatures, what statement would contain the most information in the fewest words? I believe it is the atomic hypothesis (or the atomic fact, or whatever you wish to call it) that all things are made of atoms-little particles that move around in perpetual motion, attracting each other when they are a little distance apart, but repelling upon being squeezed into one another. In that one sentence, you will see, there is an enormous amount of information about the world, if just a little imagination and thinking are applied.
Due to a lack of funding, SETI Institute shut down the radio telescope array they were using to look for evidence of extraterrestrial life outside our solar system.
The timing couldn't be worse, say SETI scientists. After millenniums of musings, this spring astronomers announced that 1,235 new possible planets had been observed by Kepler, a telescope on a space satellite. They predict that dozens of these planets will be Earth-sized -- and some will be in the "habitable zone," where the temperatures are just right for liquid water, a prerequisite of life as we know it.
(via ★genmon)
Not just a Cold War-era relic...
...the use of radiation to introduce genetic changes in food (aka "atomic gardening") is alive and well today.
What's more, the Times adds, nearly 2,000 gamma radiation-induced mutant crop varieties have been registered around the world, including Calrose 76, a dwarf varietal that accounts for about half the rice grown in California, and the popular Star Ruby and Rio Red grapefruits, whose deep colour is a mutation produced through radiation breeding in the 1970s. Similarly, Johnson tells Pruned that "most of the global production of mint oil," with an annual market value estimated at $930 million, is extracted from the "wilt-resistant 'Todd's Mitcham' cultivar, a product of thermal neutron irradiation." She adds that "the exact nature of the genetic changes that cause it to be wilt-resistant remain unknown."
The atomic gardening photos from Life magazine in 1961 are kind of great.
The article about Dan McLaughlin's quest to go from zero-to-PGA Tour through 10,000 hours of deliberate practice got linked around a bunch yesterday. Several people who pointed to it made a typical mistake. Malcolm Gladwell wrote about the 10,000 hours theory in his book, he did not come up with it. It is not "Gladwell's theory" and McLaughlin is not "testing Gladwell". The 10,000 hours theory was developed and popularized by Dr. Anders Ericsson (here for instance) -- who you may have heard of from this Freakonomics piece in the NY Times Magazine -- before it became a pop culture tidbit by Gladwell's inclusion of Ericsson's work in Outliers.
Scientists at Fermilab have found a "suspicious bump" in their data from the Tevatron that may indicate the discovery of a new particle (not the Higgs boson) or a new force of nature or a mistake.
"Nobody knows what this is," said Christopher Hill, a theorist at Fermilab who was not part of the team. "If it is real, it would be the most significant discovery in physics in half a century."
We won't have to wait too long to see if the bump is real...the LHC will reveal all soon.
And that's saying something. But look at this gem of a thread: I like big butts and I cannot lie, but is there some evolutionary reason as to why? Some of the answers:
My homeboys tried to warn me, but that butt you got makes me so confident of your current well-being and future child-rearing potential
So, ladies! (Yeah!) Ladies (Yeah!)
If you wanna roll in my Mercedes (Yeah!)
Then turn around! Stick it out! Even white boys have to make sure that their partner is of high genetic caliber so they can pass on their genes successfully.
My anaconda don't want none unless you have a high likelihood of producing healthy offspring with a minimal chance of genetic disabilities, hun.
(via @stevenbjohnson)
I haven't been keeping up with the Japan nuclear power plant situation as much as I want, but I wanted to pass along a few interesting articles. Over at Boing Boing, Maggie Koerth-Baker wrote a widely linked piece about how nuclear power plants work:
For the vast majority of people, nuclear power is a black box technology. Radioactive stuff goes in. Electricity (and nuclear waste) comes out. Somewhere in there, we're aware that explosions and meltdowns can happen. Ninety-nine percent of the time, that set of information is enough to get by on. But, then, an emergency like this happens and, suddenly, keeping up-to-date on the news feels like you've walked in on the middle of a movie. Nobody pauses to catch you up on all the stuff you missed.
As I write this, it's still not clear how bad, or how big, the problems at the Fukushima Daiichi power plant will be. I don't know enough to speculate on that. I'm not sure anyone does. But I can give you a clearer picture of what's inside the black box. That way, whatever happens at Fukushima, you'll understand why it's happening, and what it means.
MrReid, a physics teacher, writes about the situation at Fukushima:
Even with the release of steam, the pressure and temperature inside Unit 1 continued to increase. The high temperatures inside the reactor caused the protective zirconium cladding on the uranium fuel rods to react with steam inside the reactor to form zirconium oxide and hydrogen. This hydrogen leaked into the building that surrounded the reactor and ignited, damaging the surrounding building but without damaging the reactor vessel itself. Because the reactor vessel has not been compromised, the release of radiation should be minimal. It appears that a very similar situation has occurred at Unit 3 and that hydrogen is again responsible for the explosion seen there.
And this piece is a more meta take on the situation, What the Media Doesn't Get About Meltdowns.
Of immediate concern is the prospect of a so-called "meltdown" at one or more of the Japanese reactors. But part of the problem in understanding the potential dangers is continued indiscriminate use, by experts and the media, of this inherently frightening term without explanation or perspective. There are varying degrees of melting or meltdown of the nuclear fuel rods in a given reactor; but there are also multiple safety systems, or containment barriers, in a given plant's design that are intended to keep radioactive materials from escaping into the general environment in the event of a partial or complete meltdown of the reactor core. Finally, there are the steps taken by a plant's operators to try to bring the nuclear emergency under control before these containment barriers are breached.
Indian lunar orbiter Chandrayaan-1 has discovered a large cave on the Moon. Aside from the hey, cool, there's a cave on the Moon factor, the other big feature of the cave is its constant and temperate temperature.
Temperatures on the moon swing wildly, from a maximum of 262 degrees Fahrenheit to a minimum of -292. The cave holds steady at a (relatively) comfortable -4, since the moon's weather can't penetrate its 40-foot-thick wall. It could also protect astronauts from "hazardous radiations, micro-meteoritic impacts," and dust storms, according to paper published by the journal Current Science.
(via @juliandibbell)
In 1981, Ray Towler was convicted of rape, kidnapping, and felonious assault of two young children and sentenced to life in prison. Twenty-nine years later, in 2010, DNA evidence proves he didn't commit the crime and Towler is released from prison.
So many choices. Which car insurance. Which cereal. Which deodorant, toothpaste, toothbrush, soap, shampoo. Rows and rows of products. Varieties, sizes, colors. Which is cheaper? Which is better? What's the best buy? Which gum to chew? When he went into prison there were, like, two kinds of chewing gum. Now there are a zillion. One of the small gifts he gives himself is trying all the gums. "I can spoil myself a little so long as I stay within my means," he says. Papaya juice! Kiwi and strawberry nectar! Green tea! Arnold Palmer -- he was a golfer when Towler went down. Now he is a drink, sweet and so incredibly thirst quenching.
He loves work. He got out May 5 and started working June 21. Hell, I've been vacationing for thirty years. He wears a smock and pushes a mail cart. He stops at all the cubicles, greets everyone with his friendly smile. Ray even loves commuting to work, especially now, in his new car, a black Ford Focus. He's like a sixteen-year-old who can finally drive himself to school. It costs almost the same to park as it does to take the train.
File this one under "crying at work".
From physicist John Baez, a history of the major disasters that happened to the Earth: the Big Splat, the Late Heavy Bombardment, the Oxygen Catastrophe, and the Snowball Earth. The Big Splat is believed to have formed the Moon:
In 2004, the astrophysicist Robin Canup, at the Southwest Research Institute in Texas, published some remarkable computer simulations of the Big Splat. To get a moon like ours to form -- instead of one too rich in iron, or too small, or wrong in other respects -- she had to choose the right initial conditions. She found it best to assume Theia is slightly more massive than Mars: between 10% and 15% of the Earth's mass. It should also start out moving slowly towards the Earth, and strike the Earth at a glancing angle.
The result is a very bad day. Theia hits the Earth and shears off a large chunk, forming a trail of shattered, molten or vaporized rock that arcs off into space. Within an hour, half the Earth's surface is red-hot, and the trail of debris stretches almost 4 Earth radii into space. After 3 to 5 hours, the iron core of Theia and most of the the debris comes crashing back down. The Earth's entire crust and outer mantle melts. At this point, a quarter of Theia has actually vaporized!
After a day, the material that has not fallen back down has formed a ring of debris orbiting the Earth. But such a ring would not be stable: within a century, it would collect to form the Moon we know and love. Meanwhile, Theia's iron core would sink down to the center of the Earth.
Over at Boing Boing, Lee Billings has an interview with Greg Laughlin, an astrophysicist who recently came up with an equation for estimating the value of planets, a sort of Drake equation for cosmic economics.
This equation's initial purpose, he wrote, was to put meaningful prices on the terrestrial exoplanets that Kepler was bound to discover. But he soon found it could be used equally well to place any planet-even our own-in a context that was simultaneously cosmic and commercial. In essence, you feed Laughlin's equation some key parameters -- a planet's mass, its estimated temperature, and the age, type, and apparent brightness of its star -- and out pops a number that should, Laughlin says, equate to cold, hard cash.
At the time, the exoplanet Gliese 581 c was thought to be the most Earth-like world known beyond our solar system. The equation said it was worth a measly $160. Mars fared better, priced at $14,000. And Earth? Our planet's value emerged as nearly 5 quadrillion dollars. That's about 100 times Earth's yearly GDP, and perhaps, Laughlin thought, not a bad ballpark estimate for the total economic value of our world and the technological civilization it supports.
This video shows what various planets (Jupiter, Mars, etc.) would look like in the night sky if they orbited the Earth at the same distance as the Moon.
See also Imagining Earth with Saturn's rings and Helvetica! In! Space!
According to climate scientist Paul Mayewski, he and his team sometimes melt down unneeded ice cores that they've collected in places like Antarctica and drink the resulting water. The ice, as well as the air trapped within, can be more than a hundred thousand years old.
Probably the most exciting thing about it is when you have real ice -- that's where the snow has been gradually compacted and eventually formed into ice, and the density has increased. When that happens, if the ice is old, it will often trap air bubbles in it. Those air bubbles can contain carbon dioxide from ten thousand years ago or even a hundred thousand years ago. And when you put an ice cube of that ice in a glass of water, it pops. It has natural effervescence as those gas bubbles escape. You get a little a puff of air into your nostrils if you have your nose over the glass. It's not as though it necessarily smells like anything -- but when you think about the fact that the last time that anything smelled that air was a hundred thousand years ago, that's pretty interesting.
For his wedding reception, Mayewski had water from "Greenland ice and Antarctic ice" for his guests to drink. (thx, finn)
No one has been able to figure out why humans can't walk, swim, or even drive in straight lines without reference points. Instead, we go in circles:
(via df)
Luis Bettencourt of the Santa Fe Institute and his team have proposed a different way of looking at how exceptional cities are. The widely used per-capita is a linear measurement while cities' attributes tend to scale nonlinearly (or superlinearly).
The researchers have shown, in fact, that with each doubling of city population, each inhabitant is, on average, 15 percent wealthier, 15 percent more productive, 15 percent more innovative, and 15 percent more likely to be victimized by violent crime regardless of the city's geography or the decade in which you pull the data.
Remarkably, this 15 percent rule holds for a number of other statistics as well - so much so that if you tell Bettencourt and West the population of an anonymous city, they can tell you the average speed at which its inhabitants walk.
Scientists call this phenomenon "superlinear scaling." Rather than metrics increasing proportionally with population - in a "linear," or one-for-one fashion - measures that scale superlinearly increase consistently at a nonlinear rate greater than one for one.
"Almost anything that you can measure about a city scales nonlinearly, either showing economies in infrastructure or per capita gains in socioeconomic quantities," Bettencourt says. "This is the reason we have cities in the first place. But if you don't correct for these effects, you are not capturing the essence of particular places."
Using this method, cities like LA, New York, and Houston are average while San Francisco and Boulder are above average.
Jenny McCarthy just won't call it quits on the whole vaccines cause autism thing. Cause she's a mom! And moms love their children! And are strong! QED. And of course this was published by Huffington Post, the blog equivalent of Jenny McCarthy.
As if there was actually more evidence needed that vaccines don't cause autism, the 1998 British study that linked autism to childhood vaccines was recently discovered to be an elaborate fraud. Not just incorrect, a fraud.
An investigation published by the British medical journal BMJ concludes the study's author, Dr. Andrew Wakefield, misrepresented or altered the medical histories of all 12 of the patients whose cases formed the basis of the 1998 study -- and that there was "no doubt" Wakefield was responsible.
"It's one thing to have a bad study, a study full of error, and for the authors then to admit that they made errors," Fiona Godlee, BMJ's editor-in-chief, told CNN. "But in this case, we have a very different picture of what seems to be a deliberate attempt to create an impression that there was a link by falsifying the data."
Science magazine has named their top scientific breakthroughs of 2010 and the insights of the decade. The quantum paddle deservedly took the top spot:
"This year's Breakthrough of the Year represents the first time that scientists have demonstrated quantum effects in the motion of a human-made object," said Adrian Cho, a news writer for Science. "On a conceptual level that's cool because it extends quantum mechanics into a whole new realm. On a practical level, it opens up a variety of possibilities ranging from new experiments that meld quantum control over light, electrical currents and motion to, perhaps someday, tests of the bounds of quantum mechanics and our sense of reality."
From a paper published in the Journal of Cosmology entitled Sex On Mars: Pregnancy, Fetal Development, and Sex In Outer Space:
Humans are sexual beings and it can be predicted that male and female astronauts will engage in sexual relations during a mission to Mars, leading to conflicts and pregnancies and the first baby born on the Red Planet. Non-human primate and astronaut sexual behavior is reviewed including romantic conflicts involving astronauts who flew aboard the Space Shuttle and in simulated missions to Mars, and men and women team members in the Antarctic. The possibilities of pregnancy and the effects of gravity and radiation on the testes, ovaries, menstruation, and developing fetus, including a child born on Mars, are discussed. What may lead to and how to prevent sexual conflicts, sexual violence, sexual competition, and pregnancy are detailed. Recommendations include the possibility that male and female astronauts on a mission to Mars, should fly in separate space craft.
Every episode of the classic science/history series Connections (as well as Connections 2 and 3) is available online at YouTube.
Connections is a ten-episode documentary television series created, written and presented by science historian James Burke. The series was produced and directed by Mick Jackson of the BBC Science & Features Department and first aired in 1978 (UK) and 1979 (USA). It took an interdisciplinary approach to the history of science and invention and demonstrated how various discoveries, scientific achievements, and historical world events were built from one another successively in an interconnected way to bring about particular aspects of modern technology.
Connections explores an "Alternative View of Change" (the subtitle of the series) that rejects the conventional linear and teleological view of historical progress. Burke contends that one cannot consider the development of any particular piece of the modern world in isolation. Rather, the entire gestalt of the modern world is the result of a web of interconnected events, each one consisting of a person or group acting for reasons of their own motivations (e.g. profit, curiosity, religious) with no concept of the final, modern result of what either their or their contemporaries' actions finally led to. The interplay of the results of these isolated events is what drives history and innovation, and is also the main focus of the series and its sequels.
Here's the first episode to get you started.
Warning: you may not be able to stop. If you'd like to watch the series in a less irritating format, you can always purchase it on DVD.
But only if it's friendly chat...competitive conversations don't result in the same improvement. (I don't think Words With Friends counts either...)
They found that engaging in brief (10 minute) conversations in which participants were simply instructed to get to know another person resulted in boosts to their subsequent performance on an array of common cognitive tasks. But when participants engaged in conversations that had a competitive edge, their performance on cognitive tasks showed no improvement.
"We believe that performance boosts come about because some social interactions induce people to try to read others' minds and take their perspectives on things," Ybarra said. "And we also find that when we structure even competitive interactions to have an element of taking the other person's perspective, or trying to put yourself in the other person's shoes, there is a boost in executive functioning as a result."
I've noticed this effect with myself but I always thought it was the result of my introversion, i.e. competitive conversations are more stressful and sap energy and mental function more quickly than normal conversations. I know a couple of people who enjoy competitive conversation and I've largely steered clear of those interactions since realizing I always felt so blah afterwards.
According to his doctors, a Berlin man has been cured of HIV because of a stem cell transplant.
Doctors who carried out a stem cell transplant on an HIV-infected man with leukaemia in 2007 say they now believe the man to have been cured of HIV infection as a result of the treatment, which introduced stem cells which happened to be resistant to HIV infection.
The man received bone marrow from a donor who had natural resistance to HIV infection; this was due to a genetic profile which led to the CCR5 co-receptor being absent from his cells. The most common variety of HIV uses CCR5 as its 'docking station', attaching to it in order to enter and infect CD4 cells, and people with this mutation are almost completely protected against infection.
Cosmologists have discovered evidence that our universe has been "bruised" by collisions with other universes.
Today, another group says they've found something else in the echo of the Big Bang. These guys start with a different model of the universe called eternal inflation. In this way of thinking, the universe we see is merely a bubble in a much larger cosmos. This cosmos is filled with other bubbles, all of which are other universes where the laws of physics may be dramatically different to ours.
The findings are currently difficult to reproduce, but with better data on the way, scientists are hoping to get to the bottom of the matter in the next few years.
Redfield blogged a scathing attack on Saturday. Over the weekend, a few other scientists took to the Internet as well. Was this merely a case of a few isolated cranks? To find out, I reached out to a dozen experts on Monday. Almost unanimously, they think the NASA scientists have failed to make their case. "It would be really cool if such a bug existed," said San Diego State University's Forest Rohwer, a microbiologist who looks for new species of bacteria and viruses in coral reefs. But, he added, "none of the arguments are very convincing on their own." That was about as positive as the critics could get. "This paper should not have been published," said Shelley Copley of the University of Colorado.
(thx, anil)
There may only be a few dozen albino redwoods in the world; they're difficult to find so no one knows the real number. The albinos lack chlorophyll, making them unable to produce their own food, so they freeload off of a parent tree.
KQED has a short video segment about the albino redwoods as well.
NASA's astrobiology announcement is that they've found a new kind of life that incorporates the normally toxic arsenic into its DNA.
Life like us uses a handful of basic elements in the majority of its biochemistry: carbon, hydrogen, oxygen, and nitrogen for the most part. But phosphorus is also a critical element in two major ways: it's used as the backbone of the long, spiral-shaped DNA and RNA molecules (think of it as the winding support structure for a spiral staircase and you'll get the picture), and it's part of the energy transport mechanism for cells in the form of ATP (adenosine triphosphate). Without it, our cells would literally not be able to reproduce, and we'd be dead anyway if it were gone. There are many other ways phosphorus is used as well, including in cell membranes, bones, and so on. It's a key element for all forms of life.
[...]
Amazingly, using radioisotope-tagged molecules containing arsenic, they were able to find that the microbes incorporated the arsenic into their very DNA! It's hard to stress how shocking this is; as I understand it, saying something like that to a microbiologist without evidence would've had them slowly backing away from you and looking for weapons or an escape route.
I guessed wrong about what NASA was set to announce today, but the actual announcement is much more interesting than the mere discovery of extraterrestrial life. Aliens are inevitable -- we're going to find them sooner or later -- but a new kind of DNA, that's not something that happens every day. Exciting! (thx, jon)
Here's a curious press release from NASA:
NASA will hold a news conference at 2 p.m. EST on Thursday, Dec. 2, to discuss an astrobiology finding that will impact the search for evidence of extraterrestrial life. Astrobiology is the study of the origin, evolution, distribution and future of life in the universe.
I did a little research on the news conference participants and found:
1. Pamela Conrad (a geobiologist) was the primary author of a 2009 paper on geology and life on Mars
2. Felisa Wolfe-Simon (an oceanographer) has written extensively on photosynthesis using arsenic recently (she worked on the team mentioned in this article)
3. Steven Benner (a biologist) is on the "Titan Team" at the Jet Propulsion Laboratory; they're looking at Titan (Saturn's largest moon) as an early-Earth-like chemical environment. This is likely related to the Cassini mission.
4. James Elser (an ecologist) is involved with a NASA-funded astrobiology program called Follow the Elements, which emphasizes looking at the chemistry of environments where life evolves (and not just looking at water or carbon or oxygen).
So, if I had to guess at what NASA is going to reveal on Thursday, I'd say that they've discovered arsenic on Titan and maybe even detected chemical evidence of bacteria utilizing it for photosynthesis (by following the elements). Or something like that. (thx, sippey)
Update: According to Alexis Madrigal, the answer to the hyperbolic question in the headline is "no".
I'm sad to quell some of the @kottke-induced excitement about possible extraterrestrial life. I've seen the Science paper. It's not that.
Clinical trials are about to begin where embryonic stem cells will be injected into the eyes of people with Stargardt's macular degeneration.
Robert Lanza, the company's chief scientific officer, said that the first patient could receive the stem cell transplants early in the new year and although the trial is designed primarily to assess safety, the first signs of visual improvement may be apparent within weeks. "Talking to the clinicians, we could see something in six weeks, that's when we think we may see some improvements. It really depends on individual patients but that's a reasonable time frame when something may start to happen," Dr Lanza said.
Evolutionary speaking, premature ejaculation may not be such a bad thing after all.
So given these basic biological facts, and assuming that ejaculation is not so premature that it occurs prior to intromission and sperm cells find themselves awkwardly outside of a woman's reproductive tract flopping about like fish out of water, what, exactly, is so "premature" about premature ejaculation? In fact, all else being equal, in the ancestral past, wouldn't there likely have been some reproductive advantages to ejaculating as quickly as possible during intravaginal intercourse-such as, oh, I don't know, inseminating as many females as possible in as short a time frame as possible? or allowing our ancestors to focus on other adaptive behaviors aside from sex? or perhaps, under surreptitious mating conditions, doing the deed quickly and expeditiously without causing a big scene?
Still, for recreational sex, it blows. (As it were.)
John Horgan argues that in some areas, science and technology are moving in the wrong direction. Among those areas are space colonization, the origin of life, and ending infectious disease.
Decades ago antibiotics, vaccines, pesticides, water chlorination and other public health measures were vanquishing diseases such as malaria, yellow fever, polio, whooping cough, tuberculosis and smallpox, particularly in First World nations. In The Coming Plague: Newly Emerging Diseases in a World out of Balance (Penguin, 1995), the journalist Laurie Garrett noted that in 1967 U.S. Surgeon General William Stewart said that it was "time to close the books on infectious diseases" (Garrett's words) and shift resources toward non-infectious killers such as cancer and heart disease. The global eradication of smallpox in 1979 seemed to fulfill Stewart's vision. Hopes for the end of infectious disease were soon crushed, however, by the emergence of AIDS, mutant flu viruses and antibiotic-resistant forms of old killers such as tuberculosis.
In a post called Mutated Manuscripts: The Evolution of Genes and Texts, Sam Arbesman compares genetic mutations with textual mutations caused by humans.
While fun to chronicle such similarities, these similarities can also be exploited in the same way. Mutational differences between DNA sequences can be used to understand the evolutionary history of a population, or even a group of species. And so too with variants of the same manuscript. A famous example of this is from a 1998 research article in the journal Nature that quantitatively studied the differences between the 80 surviving versions of Geoffrey Chaucer's The Canterbury Tales. By subjecting the variants to a battery of genetic analyses, the researchers were able to better understand the contents of the ancestral version, Chaucer's own copy!
And if so, then what? Do animals feel? Do they have souls? This article is a nice overview of what we know about the thoughts and feelings of non-human animals.
But one by one, the berms we've built between ourselves and the beasts are being washed away. Humans are the only animals that use tools, we used to say. But what about the birds and apes that we now know do as well? Humans are the only ones who are empathic and generous, then. But what about the monkeys that practice charity and the elephants that mourn their dead? Humans are the only ones who experience joy and a knowledge of the future. But what about the U.K. study just last month showing that pigs raised in comfortable environments exhibit optimism, moving expectantly toward a new sound instead of retreating warily from it? And as for humans as the only beasts with language? Kanzi himself could tell you that's not true.
All of that is forcing us to look at animals in a new way. With his 1975 book Animal Liberation, bioethicist Peter Singer of Princeton University launched what became known as the animal-rights movement. The ability to suffer, he argued, is a great cross-species leveler, and we should not inflict pain on or cause fear in an animal that we wouldn't want to experience ourselves. This idea has never met with universal agreement, but new studies are giving it more legitimacy than ever. It's not enough to study an animal's brain, scientists now say; we need to know its mind.
Under certain circumstances, you can mix liquids of different colors, then unmix them, and not violate the second law of thermodynamics.
(via fine structure)
By smashing together lead ions instead of protons, researchers at the Large Hadron Collider have produced a "mini-Big Bang".
The collisions obtained were able to generate the highest temperatures and densities ever produced in an experiment. "This process took place in a safe, controlled environment, generating incredibly hot and dense sub-atomic fireballs with temperatures of over ten trillion degrees, a million times hotter than the centre of the Sun.
"At these temperatures even protons and neutrons, which make up the nuclei of atoms, melt resulting in a hot dense soup of quarks and gluons known as a quark-gluon plasma." Quarks and gluons are sub-atomic particles -- some of the building blocks of matter. In the state known as quark-gluon plasma, they are freed of their attraction to one another. This plasma is believed to have existed just after the Big Bang.
The US Navy is looking for a way to replace bulky antennas on warships with antennas made from seawater.
What they came up with is little more than an electromagnetic ring and a water pump. The ring, called a current probe, creates a magnetic field through which the pump shoots a steam of seawater (the salt is a key ingredient, as the tech relies on the magnetic induction properties of sodium chloride). By controlling the height and width of the, the operator can manipulate the frequency at which the antenna transmits and receives. An 80-foot-high stream can transmit and receive anywhere from 2 to 400 mHz, though much smaller streams can be used for varying other frequencies, ranging from HF through VHF to UHF.
Wow. (via bldgblog)
Tatiana and Krista Hogan are conjoined twins who not only share a bit each other's skulls but also parts of their brains. So are they two people with two brains & personalities or one person with one brain and two (split) personalities?
Adding to the conundrum, of course, are their linked brains, and the mysterious hints of what passes between them. The family regularly sees evidence of it. The way their heads are joined, they have markedly different fields of view. One child will look at a toy or a cup. The other can reach across and grab it, even though her own eyes couldn't possibly see its location. "They share thoughts, too," says Louise. "Nobody will be saying anything," adds Simms, "and Tati will just pipe up and say, 'Stop that!' And she'll smack her sister." While their verbal development is delayed, it continues to get better. Their sentences are two or three words at most so far, and their enunciation is at first difficult to understand. Both the family, and researchers, anxiously await the children's explanation for what they are experiencing.
For one thing, sleeping is more troublesome than you'd think, considering the remote location:
The onslaught of apparent days and nights would play havoc with astronauts' body clocks, so a shutters-down and bedtime schedule is imposed by mission controllers. Each of the crew has a closet-like cabin where they can hook a sleeping bag to the wall and settle down for the night. Some strap pillows to their heads to make it feel more like lying down. The lights don't go out completely, though. People dozing in orbit see streaks and bursts of bright colour caused by high-energy cosmic rays painlessly slamming into their retinas. Fans and air filters add to the distractions, so some astronauts wear ear plugs to block out the constant hum.
Unsurprisingly, falling asleep can take some getting used to. Just as you are nodding off, you can feel as though you've fallen off a 10-storey building. People who look half asleep will suddenly throw their heads back with a start and fling out their arms. It gets easier with time. One Russian crew member is renowned for doing without a sleeping bag and falling asleep wherever he ends the day. Anyone still awake after bedtime would see his snoozing form drift by, slowly bouncing off the walls, his course set by the air currents that gently pushed and pulled him.
Whoa! The whole thing is worth a read.
Lovely long piece in the November issue of Esquire about the brain of Henry Molaison, who you may have previously heard of as Patient H.M., aka the man who lacked the ability to remember anything for more than a couple of minutes. His brain has now been sliced into thin slices in an effort to construct a map of the human brain accurate to neuron-level.
Corkin first met Henry at Brenda Milner's lab in Montreal in 1962, and over the years, as the mining of his mind has continued, she's witnessed firsthand how Henry continues to give up riches, broadening our understanding of how memory works. But she's also keenly aware of Henry's enduring mysteries, has documented things about him that nobody can quite explain, not yet.
For example, Henry's inability to recall postoperative episodes, an amnesia that was once thought to be complete, has revealed itself over the years to have some puzzling exceptions. Certain things have managed, somehow, to make their way through, to stick and become memories. Henry knows a president was assassinated in Dallas, though Kennedy's motorcade didn't leave Love Field until more than a decade after Henry left my grandfather's operating room. Henry can hear the incomplete name of an icon -- "Bob Dy ..." -- and complete it, even though in 1953 Robert Zimmerman was just a twelve-year-old chafing against the dead-end monotony of small-town Minnesota. Henry can tell you that Archie Bunker's son-in-law is named Meathead.
How is this possible?
The piece is written by the grandson of the doctor who removed a portion of Molaison's brain in an effort to cure his epilepsy.
Christoph Niemann hits another one out of the park with an illustrated look at the how physics governs everything we do in life.
I loved his idea for calorie-neutral foods:
All you need is to freeze a pint of ice cream to -3706 F. The energy it will take your system to bring the ice cream up to a digestible temperature is roughly 1,000 calories, neatly burning away all those carbohydrates from the fat and sugar. The only snag is the Third Law of Thermodynamics, which says it's impossible to go below -459 F. Bummer.
After Seth Roberts started eating half a stick of butter every day, his speed in solving simple arithmetic problems increased by 30 milliseconds. Flaxseed oil also seemed to help.
This isn't animal fat versus no animal fat. Before I was eating lots of butter, I was eating lots of pork fat. It's one type of animal fat versus another type. Nor is it another example of modern processing = unhealthy. Compared to pork fat, butter is recent.
But watching the video of the talk, it's unclear what's actually being measured here...it could be that the butter is making his fingers faster at pushing the buttons. Or look at the graph...might a single line that indicates steady improvement over the course of the year also fit the data?
Researchers at Fermilab are building a holometer, the most precise clock ever, which will attempt to determine if the 3-D aspect of the universe is a hologram.
Black hole physics, in which space and time become compressed, provides a basis for math showing that the third dimension may not exist at all. In this two-dimensional cartoon of a universe, what we perceive as a third dimension would actually be a projection of time intertwined with depth. If this is true, the illusion can only be maintained until equipment becomes sensitive enough to find its limits. "You can't perceive it because nothing ever travels faster than light," says Hogan. "This holographic view is how the universe would look if you sat on a photon."
The Great Egg Race was a late-70s/early-80s BBC TV show that was a kind of Junkyard Wars on a smaller and more nerdy scale. The first episode shows a number of people attempting to build small egg carrying cars powered by rubber band.
I love this stuff. I had a physics teacher in high school who presented us with a number of these challenges throughout the school year. There was the strong toothpick bridge (someone basically cheated and made a glue bridge with embedded toothpicks) and the rolling object (it had to go down a short ramp and stop on a mark about 10 feet away), but my favorites were the mouse trap-powered car and the egg drop.
The winning mouse trap car was made with a lot of assistance from the student's father, who owned a machine shop. It was light but solid with precisely machined plastic wheels and a precisely machined axle and travelled probably twice as far as any of the other cars, which were generally built with whatever crappy off-the-shelf components could be scrounged from the local five-and-dime. I spent three satisfying late nights building my car and came in pretty close to last.
The egg drop challenge involved constructing a landing pad no taller than 12 inches for an unboiled egg. Competitors dropped their eggs from successively greater heights until the egg broke. The two winning landing pads were successful at the greatest height that our small school could muster...out a window at the top of the football field stands, probably about 35 or 40 feet tall. One was a huge box full of wool and other soft materials that could have successfully cushioned an egg dropped from the top of the Sears Tower. The other winner was a tupperware bowl full of stale popcorn that your humble blogger grabbed off the counter the morning of the challenge after completely forgetting about it over the weekend. No one was more surprised than I to discover that popcorn is an ideal egg cushioning material...not that I let on. :)
The Big Picture has a selection of photos of the National Ignition Facility which I've written about previously.
"Creating a miniature star on Earth" is the goal of the National Ignition Facility (NIF), home to the world's largest and highest-energy laser in Livermore, California. On September 29th, 2010, the NIF completed its first integrated ignition experiment, where it focused its 192 lasers on a small cylinder housing a tiny frozen capsule containing hydrogen fuel, briefly bombarding it with 1 megajoule of laser energy. The experiment was the latest in a series of tests leading to a hoped-for "ignition", where the nuclei of the atoms of the fuel inside the target capsule are made to fuse together releasing tremendous energy -- potentially more energy than was put in to start the initial reaction, becoming a valuable power source.
The NIF and the LHC are this generation's Apollo program.
That habitable exoplanet discovery? Maybe not.
Astronomer Francesco Pepe of the Geneva Observatory in Switzerland, who spoke Oct. 11 at an International Astronomical Union symposium on planetary systems, reported a new analysis using only HARPS data, but adding an extra 60 data points to the observations published in 2008. He and his colleagues could find no trace of the planet.
Using motion tracking software, Rhett Allain finds out if the flight of the slingshotted Angry Birds adheres to the laws of physics.
The only force acting on the bird (if the bird is not moving too fast) would be the gravitational force from the Earth. This is where I see lots of intro-student mistakes. They tend to want to put some force in the horizontal direction because the bird is moving that way. DON'T do that. That is what Aristotle would have you believe, but you don't want to be in his club. There is no horizontal force in this case -- no air resistance.
He also determines the height of the red bird: about 2.3 feet tall. The big red bird must be at least double that.
Using journals kept aboard ships and the sweat of volunteers (that's *you*), Old Weather is attempting to compile a more accurate look at our planet's recent climate.
Help scientists recover worldwide weather observations made by Royal Navy ships around the time of World War I. These transcriptions will contribute to climate model projections and improve a database of weather extremes. Historians will use your work to track past ship movements and the stories of the people on board.
...aka WEIRD. The majority of the subjects in behavioral science testing are WEIRD people, who make up only a small percentage of the global population. You can see where this would be a problem.
In the "ultimatum game", for example, people are given $100 and told to offer some of it to someone else; if the other person accepts, each keeps their portion, but if they reject the offer, nobody gets anything. On average, Americans offer just under half, which seems to say much about human notions of fairness, or the fear of making an insultingly low offer. But many cultures behave differently; the Machiguenga of Peru prefer to keep more cash or, if on the other side of the deal, to accept whatever is offered. Another example: speakers of the Mayan language of Tzeltal are among several more likely to describe things as east or west of each other, not on the left or right. Academics would bristle, the researchers note, if journals were renamed with titles such as Journal of Personality and Social Psychology of American Undergraduate Psychology Students. But perhaps they should be.
(via russell davies)
A team of scientists has discovered a potentially habitable planet located about 20 light years from Earth.
The paper reports the discovery of two new planets around the nearby red dwarf star Gliese 581. This brings the total number of known planets around this star to six, the most yet discovered in a planetary system other than our own solar system. Like our solar system, the planets around Gliese 581 have nearly circular orbits.
The most interesting of the two new planets is Gliese 581g, with a mass three to four times that of the Earth and an orbital period of just under 37 days. Its mass indicates that it is probably a rocky planet with a definite surface and that it has enough gravity to hold on to an atmosphere, according to Vogt.
Gliese 581, located 20 light years away from Earth in the constellation Libra, has a somewhat checkered history of habitable-planet claims. Two previously detected planets in the system lie at the edges of the habitable zone, one on the hot side (planet c) and one on the cold side (planet d). While some astronomers still think planet d may be habitable if it has a thick atmosphere with a strong greenhouse effect to warm it up, others are skeptical. The newly discovered planet g, however, lies right in the middle of the habitable zone.
Sam Arbesman's prediction of May 2011 might have been too conservative. And 20 light years...that means we could send a signal there, and if someone of sufficient technological capability is there and listening, we could hear something back within our lifetime. Contact! (thx, jimray)
Due to the Moon's relative position in the sky as Neil Armstrong started his moonwalk, Australia was able to capture the first few minutes of his descent down the ladder before NASA was able to find a signal. But it was lost until recently; the restored footage will be shown next week at an event in Sydney.
This is a blog post that links to a news website article about a scientific paper. The pullquote explains it so I don't have to bother:
In this paragraph I will state the main claim that the research makes, making appropriate use of "scare quotes" to ensure that it's clear that I have no opinion about this research whatsoever.
In this paragraph I will briefly (because no paragraph should be more than one line) state which existing scientific ideas this new research "challenges".
If the research is about a potential cure, or a solution to a problem, this paragraph will describe how it will raise hopes for a group of sufferers or victims.
And then I'll make a little joke about one of the study's possible conclusions. (via someone who actually found the thing and sent it on to this lazy "curator")
Several physicists weigh in on what would happen if you were to place your hand in the proton stream of the Large Hadron Collider at CERN.
There's not a definite answer...the responses range from "nothing" to "you'd die for sure, instantly".
Using computer modeling of a process called wind setdown, researchers have come up with a plausible scientific explanation of the Biblical parting of the Red Sea.
This animation shows how a strong east wind over the Nile Delta could have pushed water back into ancient waterways after blowing for about nine hours, exposing mud flats and possibly providing an overland escape route similar to the biblical account of the Red Sea parting.
Have you ever thought about a rocket as a giant flying Thermos bottle? You will now:
Lovely bit of production there as well. (via russell davies)
This little guy is a newborn uncontrolled nuclear fisson reaction. You know, an atomic bomb.
This is from a NY Times photo slideshow of atomic bomb explosions. Check out the school bus sequence starting at slide #14.
Using the properties of previously discovered exoplanets (that is, planets outside of our solar system) and their dates of discovery, Sam Arbesman and Greg Laughlin predict that the discovery of the first Earth-like exoplanet will likely occur in early May 2011.
Of course, it's a bit more complicated than that, but here's an overview of what we did. Using the properties of previously discovered exoplanets, we developed a simple metric of habitability for each planet that uses its mass and temperature to rate it on a scale of 0 to 1, where 1 is Earth-like, and 0 is so very not Earth-like. Plotting these values over time and taking the upper envelope yields a nice march towards habitability.
The authors don't address this directly in their paper, but I wondered what the Moore's Law for planetary discovery might be -- e.g. every X years (or months?), the habitability of the most habitable planet discovered doubles. So I emailed Sam Arbesman and he said that his quick back of the envelope calculation would be "half a month or so"...which is an astounding pace.
The debate is essentially over and the final word is in: vaccines do not cause autism. The results of a rigorous study conducted over several years were just announced and they confirmed the results of several past studies.
Basically, the final two groups that were studied consisted of 256 children with ASD [autism spectrum disorders] and 752 matched controls. One very interesting aspect that looks as though it were almost certainly placed into the experimental design based on concerns of anti-vaccine advocates like Sallie Bernard is a group of children who underwent regression. Basically, the study examined whether there was a correlation between ASD and TCV [thimerosal-containing vaccines, i.e. mercury-containing vaccines] exposure. It also examined two subsets of ASD, autistic disorder (AD) and ASD with regression, looking for any indication whether TCVs were associated with any of them. Regression was defined as:
"the subset of case-children with ASD who reported loss of previously acquired language skills after acquisition."
Also, when adding up total thimerosal exposure, the investigators also included any thimerosal exposure that might have come prenatally from maternal receipt of flu vaccines during pregnancy, as well as immunoglobulins, tetanus toxoids, and diphtheria-tetanus. In other words, investigators tried to factor in all the various ideas for how TCVs might contribute to autism when designing this study.
So what did the investigators find? I think you probably know the answer to that question. They found nothing. Nada. Zip. There wasn't even a hint of a correlation between TCV exposure and either ASD, AD, or ASD with regression:
"There were no findings of increased risk for any of the 3 ASD outcomes. The adjusted odds ratios (95% confidence intervals) for ASD associated with a 2-SD increase in ethylmercury exposure were 1.12 (0.83-1.51) for prenatal exposure, 0.88 (0.62-1.26) for exposure from birth to 1 month, 0.60 (0.36-0.99) for exposure from birth to 7 months, and 0.60 (0.32- 0.97) for exposure from birth to 20 months."
The last result is a bit of an anomaly in that it implies that exposure to TCVs from birth to 1 month and birth to 7 months actually protects against ASD. The authors quite rightly comment on this result thusly:
"In the covariate adjusted models, we found that an increase in ethylmercury exposure in 2 of the 4 exposure time periods evaluated was associated with decreased risk of each of the 3 ASD outcomes. We are not aware of a biological mechanism that would lead to this result."
So get your kids (and yourselves) vaccinated and save them & their playmates from this whooping cough bullshit, which is actually killing actual kids and not, you know, magically infecting them with autism. Vaccination is one of the greatest human discoveries ever -- yes, Kanye, OF ALL TIME -- has saved countless lives, and has made countless more lives significantly better. So: Buck. Up.
Stephen Hawking's new book is out: The Grand Design, sequel to A Brief History of Time written with Leonard Mlodinow.
In The Grand Design we explain why, according to quantum theory, the cosmos does not have just a single existence, or history, but rather that every possible history of the universe exists simultaneously. We question the conventional concept of reality, posing instead a "model-dependent" theory of reality. We discuss how the laws of our particular universe are extraordinarily finely tuned so as to allow for our existence, and show why quantum theory predicts the multiverse--the idea that ours is just one of many universes that appeared spontaneously out of nothing, each with different laws of nature. And we assess M-Theory, an explanation of the laws governing the multiverse, and the only viable candidate for a complete "theory of everything."
Why are long free kicks suprisingly effective in soccer matches? Science explains!
For a well-struck soccer ball, the researchers estimate, one might expect a gentle arc followed by a sharp hook at about 50 meters -- in rough agreement with the distance of Roberto Carlos's free kick. In other words, if a soccer player has the strength to drive a ball halfway down the field with plenty of velocity and spin, he or she can expect to benefit from an unexpected curve late in the ball's trajectory.
But really, this is just an excuse to show you Roberto Carlos' amazing free kick against France in 1997:
Pure awesometown. But it might not be even be better than this one:
Newton said the speed of gravity is infinite but according to Einstein (and some nifty interstellar measurements), it most certainly is not.
But in general relativity, things are much more intricate, and incredibly interesting. First off, it isn't mass, per se, that causes gravity. Rather, all forms of energy (including mass) affect the curvature of space. So for the Sun and the Earth, the incredibly large mass of the Sun dominates the curvature of space, and the Earth travels in an orbit along that curved space.
If you simply took the Sun away, space would go back to being flat, but it wouldn't do so right away at every point. In fact, just like the surface of a pond when you drop something into it, it snaps back to being flat, and the disturbances send ripples outward!
The New Yorker has a long profile of Francis Collins, the ardent Christian whom Obama picked to head up the NIH, and the NIH's role in embryonic stem cell research.
A year later, Obama's appointment of Collins seemed an inspired choice. The President had found not only a man who reflected his own view of the harmony between science and faith but an evangelical Christian who hoped that the government's expansion of embryonic-stem-cell research might bring the culture war over science to a quiet end. On August 23rd, however, Judge Royce C. Lamberth, of the Federal District Court for the District of Columbia, halted federal spending for embryonic-stem-cell research, putting hundreds of research projects in limbo and plunging the N.I.H. back into a newly contentious national debate.
During a search for a radioactive isotope-based random number generator, researchers discovered that radioactive decay rates, previously thought to be constant, appear to be influenced by the activity of the Sun.
On Dec 13, 2006, the sun itself provided a crucial clue, when a solar flare sent a stream of particles and radiation toward Earth. Purdue nuclear engineer Jere Jenkins, while measuring the decay rate of manganese-54, a short-lived isotope used in medical diagnostics, noticed that the rate dropped slightly during the flare, a decrease that started about a day and a half before the flare.
If this apparent relationship between flares and decay rates proves true, it could lead to a method of predicting solar flares prior to their occurrence, which could help prevent damage to satellites and electric grids, as well as save the lives of astronauts in space.
The decay-rate aberrations that Jenkins noticed occurred during the middle of the night in Indiana -- meaning that something produced by the sun had traveled all the way through the Earth to reach Jenkins' detectors. What could the flare send forth that could have such an effect?
Jenkins and Fischbach guessed that the culprits in this bit of decay-rate mischief were probably solar neutrinos, the almost massless particles famous for flying at nearly the speed of light through the physical world -- humans, rocks, oceans or planets -- with virtually no interaction with anything.
Maybe the science part of 2012 wasn't so far-fetched after all. (No, not really.)
To keep your bubbly bubbly, serve it cold and pour it like a beer into a tilted glass.
The beer-like way of serving champagne was found to impact its concentration of dissolved CO2 significantly less. Moreover, the higher the champagne temperature is, the higher its loss of dissolved CO2 during the pouring process, which finally constitutes the first analytical proof that low temperatures prolong the drink's chill and helps it to retain its effervescence during the pouring process.
If you are filming a Girls Gone Wild video or are in the late stages of a wedding reception, pouring champagne directly into a person's mouth is also an effective bubble-preservation technique. (via @matthiasrascher)
I don't know what is being represented in either of these posts from but does it float, but they're both capital G Gorgeous.
The images from 'The most interesting trend in the development of the Internet is not how it is changing people's ways of thinking but how it is adapting to the way that people think' are from 3D compositions (concepts for Iron Man 2) by Prologue.
Here's an example from 'The most intense moments the universe has ever known are the next 15 seconds', which is a gallery of the University of Florida Sparse Matrix Collection.
(Thanks, Adam)
Is there a word for a scientific fact that is accepted, only to be proven false some years later?
Pluto
Brontosaurus
and now Triceratops
I'm sure there are more of these, vagaries of science we learned as children ripped cruelly from our pathways in an effort to embarrass us in front of our children (well, your children, mine are imaginary). Let's make a list? Hit me with an @reply if you know of something that should be on this list.
Update:
This post didn't quite come out the way I wanted. The triceratops was only momentarily in danger as scientists decided to do away with the Torosaurus instead. Also, Jason wrote a post about a similar topic a couple months ago. Mesofacts are the name for facts that change slowly over time. It's an important distinction, though, that these 'facts', Pluto and Brontosaurus, at least, were ripped away suddenly, instead of changing slowly over time. The only Twitter suggestion I thought fit completely was the loss of RBI as a telling baseball statistic.
A lightning strike recorded at 9000 frames per second.
The action across time scales displayed in this video is amazing. One strike hovers in the frame almost the entire time while other hundreds of other strikes flicker in and out in single frames.
By further isolating where the Higgs boson isn't, scientists are finally closing in on the discovery of the so-called God particle...or proving that it doesn't exist at all.
Its mass -- in the units preferred by physicists -- is not in the range between 158 billion and 175 billion electron volts, according to a talk by Ben Kilminster of Fermilab at the International Conference on High Energy Physics in Paris.
Rates of breast cancer and melanoma in humans are on the rise and appear to favor the left side of the body. A suspected cause is that the box springs in our beds act as antennas to focus the EM radiation from FM radio and broadcast television directly into the left sides of our bodies. No, really:
Electromagnetic waves resonate on a half-wavelength antenna to create a standing wave with a peak at the middle of the antenna and a node at each end, just as when a string stretched between two points is plucked at the center. In the U.S. bed frames and box springs are made of metal, and the length of a bed is exactly half the wavelength of FM and TV transmissions that have been broadcasting since the late 1940s.
(thx, anna)
Update: So, you know when you run across something about some current scientific theory or hypothesis on a blog or in a magazine or newspaper or even in a scientific journal, there's a fair chance that whatever the article says is misleading, misstated, or even incorrect. That's just how it is and if you didn't know, now you do. Take this stuff with a grain of salt. It's why I use phrases like "suspected cause" instead of something like "box springs and FM radio proven to cause cancer".
I don't post things like this because I think they're right, I post them because I think they are interesting. The geometry of TV signals and box springs causing cancer on the left sides of people's bodies in Western countries...that's a clever bit of hypothesizing, right or wrong.
In this case, an organization I know nothing about (Vetenskap och Folkbildning from Sweden) says that Olle Johansson, one of the researchers who came up with the box spring hypothesis, is a quack. In fact, he was "Misleader of the year" in 2004. What does this mean in terms of his work on box springs and cancer? I have no idea. All I know is that on one side you've got Olle Johansson, Scientific American, and the peer-reviewed journal (Pathophysiology) in which Johansson's hypothesis was published. And on the other side, there's Vetenskap och Folkbildning, a number of commenters on the SciAm post, and a bunch of people in my inbox. Who's right? Who knows. It's a fine opportunity to remain skeptical. (thx, tom)
Sam Kean is blogging the periodic table of elements over at Slate.
Starting today, I'll be posting on a different element each weekday (the blog will run through early August), starting with the racy history of an element we've known about for hundreds of years, antimony, and ending on an element we've only just discovered, the provisionally named ununseptium. I'll be covering many topics-explaining how the table works, relaying stories both funny and tragic, and analyzing current events through the lens of the table and its elements. Above all, I hope to convey the unexpected joys of the most diverse and colorful tool in all of science.
If you like that, Kean has written a whole book on the topic.
ScienceBlogs has added a blog about "innovations in science, nutrition and health policy" sponsored by Pepsi to their roster. Posters to the blog will include Pepsi research staff. Some of the other bloggers on ScienceBlogs are not happy.
However, that said, I am completely mystified by ScienceBlogs' latest development: adding the PepsiCo "nutrition" Blog. How does ScienceBlogs expect to maintain their (OUR) credibility as a science news source (we are picked up by Google news searches afterall) when they are providing paid-for content under the guise of news? Further, I cannot imagine what sorts of credible nutrition research PepsiCo is doing that they can or will actually talk about publicly, nor can I possibly imagine any "food" corporation actually caring about promoting public health. PepsiCo is a corporation, not a research institute, fer crissakes!
(via @tcarmody)
In a "major breakthrough", researchers have discovered fossils in Gabon of multicellular organisms that are 2.1 billion years old.
These new fossils, of various shapes and sizes, imply that the origin of organized life is a lot older than is generally admitted, thus challenging current knowledge on the beginning of life.
Scientists are working on two fronts toward a cure for AIDS: 1) neutralizing HIV in the human body so that regular medication is unnecessary, and 2) eradicating all traces of HIV in the body.
Human immune-system stem cells are transplanted into pups bred from these mice when they are two days old, and over the next few months, those cells mature and diversify into a working immune system. Then the mice are infected with HIV, which attacks the immune cells. But before transplanting the original human cells, the researchers introduce an enzyme that interferes with the gene for a protein the virus needs to stage the attack. This modification makes a small percentage of the mature immune cells highly resistant to HIV, and because the virus kills the cells it can infect, the modified cells are the only ones that survive over time. Thus, the HIV soon runs out of targets. If this strategy works, the virus will quickly become harmless and the mice will effectively be cured.
Lead ingots carried by a Roman ship sunk in 50 BC will be used to study the decay of neutrinos. Neutrino experiments are very delicate and need to be shielded from radioactive contamination, including possible contamination from the shielding itself.
This vast stretch of time means that the tiny amount of the radioactive isotope lead-210 originally present in the ingots, just as it exists in any normal lead object, has by now almost completely disappeared.
(via history blog)
Errol Morris is back with a new piece on his NY Times blog about how the holes in people's knowledge affect their actions.
If I were given carte blanche to write about any topic I could, it would be about how much our ignorance, in general, shapes our lives in ways we do not know about. Put simply, people tend to do what they know and fail to do that which they have no conception of. In that way, ignorance profoundly channels the course we take in life. And unknown unknowns constitute a grand swath of everybody's field of ignorance.
This is part one of a five-part series in which we hear from David Dunning about the Dunning-Kruger Effect.
When people are incompetent in the strategies they adopt to achieve success and satisfaction, they suffer a dual burden: Not only do they reach erroneous conclusions and make unfortunate choices, but their incompetence robs them of the ability to realize it.
Not content with movie stars, California wants its own actual stellar object. The LIFE project at the NIF (National Ignition Facility) at the Lawrence Livermore National Laboratory aims to create a tiny star with intense laser power. How intense? The facility increases the power of the laser beam a quadrillion times before it reaches its target:
The National Ignition Facility, located at Lawrence Livermore National Laboratory, is the world's largest laser system... 192 huge laser beams in a massive building, all focused down at the last moment at a 2 millimeter ball containing frozen hydrogen gas. The goal is to achieve fusion... getting more energy out than was used to create it. It's never been done before under controlled conditions, just in nuclear weapons and in stars. We expect to do it within the next 2-3 years. The purpose is threefold: to create an almost limitless supply of safe, carbon-free, proliferation-free electricity; examine new regimes of astrophysics as well as basic science; and study the inner-workings of the U.S. stockpile of nuclear weapons to ensure they remain safe, secure and reliable without the need for underground testing.
Wow. The fusion will produce high-energy neutrons, which will bombard a material capable of converting their energy into heat, which in turn will make steam and eventually electricity. But it gets even better:
In addition, the LIFE engine design can be "charged" with fission fuel. The resulting fission reactions will produce additional energy that can be harvested for electricity production. Moreover, by using depleted uranium or spent nuclear fuel from existing nuclear power plants in the blanket, a LIFE engine will be capable of burning the by-products of the current nuclear fuel cycle. Because the fusion neutrons are produced independently of the fission process, the fission fuel could be used without reprocessing. In this way, LIFE may be able to consume nuclear waste as fuel, mitigate against further nuclear proliferation, and provide long-term sustainability of carbon-free energy. A LIFE engine, via pure fusion or through the combination of fusion and fission, will generate the steady heat required to drive turbines for generating from 1,000 to 2,500 MW of safe, environmentally attractive electric power 24 hours a day for decades.
Also, free unicorns for everyone!
Number three on this Smithsonian Magazine list is "There have been mass extinctions in the past, and we're probably in one now."
Today, according to many biologists, we're in the midst of a sixth great extinction. Mastodons may have been some of the earliest victims. As humans moved from continent to continent, large animals that had thrived for millions of years began to disappear-mastodons in North America, giant kangaroos in Australia, dwarf elephants in Europe. Whatever the cause of this early wave of extinctions, humans are driving modern extinctions by hunting, destroying habitat, introducing invasive species and inadvertently spreading diseases.
Did you know the Brontosaurus isn't actually a dinosaur?
The question of the popular Brontosaurus name verses the technically-correct Apatosaurus name came to a head in 1989 when the U.S. Post Office decided to release a set of four stamps illustrating "dinosaurs." One in the series was a picture of a large sauropod labeled Brontosaurus. This upset some dinosaur enthusiasts who accused the Postal Service of promoting scientific illiteracy, an ironic accusation given the number of museums that had the animal mislabeled for decades. While there was a hue and cry over the Brontosaurus name, few even mentioned the other, more glaring error, which was the inclusion of a Pteranodon (a flying reptile) in a set of dinosaur stamps. By definition dinosaurs do not have wings.
I totally had no idea this had happened...I must have been brainwashed by all those hours of the Flintstones I watched as a child. (via unlikely words)
Can't get enough of the Leidenfrost effect? I know! Me either! In addition to helping with nonstick cooking, the L. effect also allows you to stick your hand into an 850° pot of molten lead without injury.
Skip to 1:55 for the good stuff. Bananas! Absolutely bananas! Oh, and this also works for liquid nitrogen as well. (thx, kyle)
This blog post and accompanying videos show you how to preheat your frying pan to the precise temperature at which your food won't stick. It involves waiting until a small splash of water in the pan forms a single mercury-like ball that floats (literally!) around the pan. Too hot and the water will disperse into smaller balls; too cold and it'll just boil off instantly.
The water "hovering" over the stainless steel pan like mercury happens due to the phenomenon known as the Leidenfrost effect. You can read more about it on wikipedia, but the basic idea is this: at a certain temperature known as the Leidenfrost point (roughly around 320F for water, but varying with surface and pressure), when the water droplet hits the hot pan, the bottom part of the water vaporizes immediately on contact. The resulting gas actually suspends the water above it and creates a pocket of water vapor that slows further heat transfer between the pan and the water. Thus it evaporates more slowly than it would at lower temperatures. At the proper temperature, a similar effect happens with the food you place in the pan, preventing the food from sticking.
This is possibly the best kitchen tip I've ever heard. (thx, jim)
Phil Plait of Bad Astronomy takes on Steve Jobs' claim that iPhone 4's pixels are too small for the human eye to see individually. I have confidence in Plait's conclusions:
I know a thing or two about resolution as well, having spent a few years calibrating a camera on board Hubble.
He may as well have pulled Marshall McLuhan out from behind a movie poster.
The man/machine union marches ever closer.
Scientists have embedded a nano-sized transistor inside a cell-like membrane and powered it using the cell's own fuel. The research could lead to new types of man-machine interactions where embedded devices could relay information about the inner workings of disease-related proteins inside the cell membrane, and eventually lead to new ways to read, and even influence, brain or nerve cells.
When I first saw the headline, I thought that it said "embedded a nano-sized transistor radio"...now that would be something. (via jb)
When this magnetic top is set spinning over another magnet, it levitates. No superconduction necessary.
(via @ebertchicago)
Earlier today I posted about one of the world's puzzle pieces being put into place, and now word of one of the world's pieces popping out of place. Last week, the wire supporting Foucault pendulum's snapped, and was damaged beyond repair.
(via @daveg)
I don't know what it means, but I always get excited when a longstanding equation is solved. It's as if another puzzle piece of how the world works has been snapped into place... What, too sappy?
Pennsylvania mathematicians have found solutions to a 140-year-old, 7-dimensional equation that were not known to exist for more than a century despite its widespread use in modeling the behavior of gases.
A team of archeologists used aircraft-mounted LIDAR (a laser-based distance measuring system) to map the Mayan ruins of Caracol
. The imaging revealed more of the ruins in four days than on-the-ground teams have been able to do in the past 25 years.
The Chases, who are professors of anthropology at the University of Central Florida in Orlando, had determined from earlier surveys that Caracol extended over a wide area in its heyday, between A.D. 550 and 900. From a ceremonial center of palaces and broad plazas, it stretched out to industrial zones and poor neighborhoods and beyond to suburbs of substantial houses, markets and terraced fields and reservoirs. This picture of urban sprawl led the Chases to estimate the city's population at its peak at more than 115,000. But some archaeologists doubted the evidence warranted such expansive interpretations.
"Now we have a totality of data and see the entire landscape," Dr. Arlen Chase said of the laser findings. "We know the size of the site, its boundaries, and this confirms our population estimates, and we see all this terracing and begin to know how the people fed themselves."
According to Stephen Hawking, there are three good ways to do it.
If we want to travel into the future, we just need to go fast. Really fast. And I think the only way we're ever likely to do that is by going into space. The fastest manned vehicle in history was Apollo 10. It reached 25,000mph. But to travel in time we'll have to go more than 2,000 times faster. And to do that we'd need a much bigger ship, a truly enormous machine. The ship would have to be big enough to carry a huge amount of fuel, enough to accelerate it to nearly the speed of light. Getting to just beneath the cosmic speed limit would require six whole years at full power.
D.T. Max on the Secrets of Sleep for National Geographic.
An animal must lie still for a great stretch of time, during which it is easy prey for predators. What can possibly be the payback for such risk? "If sleep doesn't serve an absolutely vital function," the renowned sleep researcher Allan Rechtschaffen once said, "it is the greatest mistake evolution ever made." [...]
At Stanford University I visited William Dement, the retired dean of sleep studies, a co-discoverer of REM sleep, and co-founder of the Stanford Sleep Medicine Center. I asked him to tell me what he knew, after 50 years of research, about the reason we sleep. "As far as I know," he answered, "the only reason we need to sleep that is really, really solid is because we get sleepy."
And this fatal familial insomnia sounds like a horrible disease:
The main symptom of FFI, as the disease is often called, is the inability to sleep. First the ability to nap disappears, then the ability to get a full night's sleep, until the patient cannot sleep at all. The syndrome usually strikes when the sufferer is in his or her 50s, ordinarily lasts about a year, and, as the name indicates, always ends in death.
James Cameron spoke about the science of Avatar at Caltech last month; Discovery has a summary.
"We tried to make it not completely fanciful," Cameron told the crowd, which filled the auditorium. "If it was too outlandish, there would be a believability gap." So while Pandora features floating mountains, that might not be so far-fetched, Cameron said, considering Earth has developed high-speed "bullet" trains that levitate on magnetic fields. Of course, the "reality-based" scenario did have its limits. "We figured that to actually lift mountains, the magnetic field would have to be strong enough to rip the hemoglobin out of your blood," says Cameron. "But we decided not to go there."
No word on whether he addressed the Na'vi's lack of technological advancement.
Frito-Lay wants to change the shape of the salt they put on their potato chips to increase the surface area exposed to taste buds and therefore decrease the amount of salt needed on each chip.
"Early on in our research, it became apparent that the majority of salt on a snack doesn't even have time to dissolve in your saliva because you swallow it so rapidly," explained Mehmood Khan, senior vice president and chief scientific officer and a former Mayo Clinic endocrinologist. A Wall Street Journal story later reported only about 20 percent of the salt on a chip dissolves on the tongue, and the remaining 80 percent is swallowed without contributing to taste.
I'm confused as to why "an understanding of crystal chemistry" is necessary. Why couldn't they just crush/grind the salt into a fine powder instead? Are the cubic crystals still too big even when crushed?
There are a ridiculous number of microbes in the Earth's oceans.
During an 11 month study in 2007, scientists sequenced the genes of more than 180,000 specimens from the Western English Channel. Although this level of sampling "far from exhausted the total diversity present," they wrote, one in every 25 readings yielded a new genus of bacteria (7,000 genera in all).
That's genus, not species. Kevin Kelly translates:
This suggests there is a long tail of life in bacteria, with a few species super-abundant, but many many species with very thin populations. At the far end of the tail there may be a billion species with only a few individuals. [...] And like other kinds of long tails, the sum of all these small bits total up to exceed the sum of individuals in the most popular species. As the microbiologists involved in the Census of Marine Life like to say, this survey reveals life's "hidden majority."
Today only, the usually $499 DNA test from 23andMe is only $99. Ship your spit off and in a few weeks, you'll receive information about your ancestry, health risks, and so on.
DNA testing for $100! Stick that in your flying car's tailpipe and smoke it!
The Natural History Museum got a lot of hate mail from children when they demoted Pluto from planet to a resident of the Kuiper Belt, including this one from a fellow named Will:
In order to see if a lava lamp would still function on Jupiter, Neil Fraser built a large centrifuge to try it out. This is the best homemade centrifuge video you'll see today:
He used the accelerometer on an Android phone to measure the G force.
The centrifuge is a genuinely terrifying device. The lights dim when it is switched on. A strong wind is produced as the centrifuge induces a cyclone in the room. The smell of boiling insulation emanates from the overloaded 25 amp cables. If not perfectly adjusted and lubricated, it will shred the teeth off solid brass gears in under a second. Runs were conducted from the relative safety of the next room while peeking through a crack in the door.
Jonah Lehrer on what our brains are up to when we're shopping at Costco.
As I note in How We Decide, this data directly contradicts the rational models of microeconomics. Consumers aren't always driven by careful considerations of price and expected utility. We don't look at the electric grill or box of chocolates and perform an explicit cost-benefit analysis. Instead, we outsource much of this calculation to our emotional brain, and rely on relative amounts of pleasure versus pain to tell us what to purchase.
CERN finally spun up the Large Hadron Collider and smashed some protons together.
"If you want to discover new particles, you have to produce them; and these new particles are massive. To produce them, you need higher energies. For the first time [on Tuesday], we will be producing particles that have energy 3.5 times higher than the maximum energy achieved so far. [...] At the end of the 7 TeV (3.5 TeV per beam) experimental period, the LHC will be shut down for maintenance for up to a year. When it re-opens, it will attempt to create 14 TeV events.
Perhaps the framework of the Universe is information and that forces like gravity are emergent phenomena.
Verlinde suggested that gravity is merely a manifestation of entropy in the Universe. His idea is based on the second law of thermodynamics, that entropy always increases over time. It suggests that differences in entropy between parts of the Universe generates a force that redistributes matter in a way that maximises entropy. This is the force we call gravity.
I'm a sucker for would-be GUTs; this one seems especially interesting to consider.
Poet Christian Bök wants to compose a poem and encode it into the DNA of the Deinococcus radiodurans bacteria -- "the most radiation-resistant organism known".
He wants to inject the DNA with a string of nucleotides that form a comprehensible poem, and he also wants the protein that the cell produces in response to form a second comprehensible poem.
AGGCGT GCCACC AAT
TCT TACC GATTT CT
CA CTCTAG ACC CTG
AGCCCA CGC GGTTCA
(via mr)
Researchers at Princeton have shown that if you keep the number of calories the same, rats eating high-fructose corn syrup "gained significantly more weight" than rats who ate table sugar.
Some people have claimed that high-fructose corn syrup is no different than other sweeteners when it comes to weight gain and obesity, but our results make it clear that this just isn't true, at least under the conditions of our tests," said psychology professor Bart Hoebel, who specializes in the neuroscience of appetite, weight and sugar addiction. "When rats are drinking high-fructose corn syrup at levels well below those in soda pop, they're becoming obese -- every single one, across the board. Even when rats are fed a high-fat diet, you don't see this; they don't all gain extra weight.
But not so fast sugar lovers:
The new research complements previous work led by Hoebel and Avena demonstrating that sucrose [i.e. "regular sugar"] can be addictive, having effects on the brain similar to some drugs of abuse.
So you're screwed either way.
In paintings of the Last Supper done over the past 1000 years, the portion sizes of the food depicted have increased by 69%.
From the 52 paintings, which date between 1000 and 2000 A.D., the sizes of loaves of bread, main dishes and plates were calculated with the aid of a computer program that could scan the items and rotate them in a way that allowed them to be measured. To account for different proportions in paintings, the sizes of the food were compared to the sizes of the human heads in the paintings.
The opening paragraph of the article says it all:
A team of scientists has succeeded in putting an object large enough to be visible to the naked eye into a mixed quantum state of moving and not moving.
Wait, what? Like, WHAT? Ok, let's start over:
Andrew Cleland at the University of California, Santa Barbara, and his team cooled a tiny metal paddle until it reached its quantum mechanical 'ground state' -- the lowest-energy state permitted by quantum mechanics. They then used the weird rules of quantum mechanics to simultaneously set the paddle moving while leaving it standing still.
The fuck? In my day, we were taught, with the help of non-graphing calculators and paper notebooks, that quantum mechanics was a lot of wand-wavey nonsense about wave/particle duality that you never had to worry about because it belonged to some magical tiny land that no one visits with their actual eyes. This...this is straight-up magic. [Cue Final Countdown]
Attention @THE_REAL_SHAQ: it's all about parabolas and backspin.
Free-throw success is also improved by adding a little backspin, which pushes the ball downward if it hits the back of the rim. The North Carolina State engineers calculated the ideal rate of free-throw backspin at three cycles per second. That is, a shot that takes one second to reach the basket will make three full revolutions counterclockwise as seen from the stands on the player's right side.
(via mr)
In a review in Prospect, Matt Ridley, who is no slouch as a science writer himself, calls Andrew Montford's The Hockey Stick Illusion "one of the best science books in years". Pretty high praise for what Ridley also calls "the biography of a graph". Specifically, this graph:
You may have seen it in An Inconvenient Truth in this form. The graph shows the dramatic rise in temperature in the northern hemisphere over the past 100 years caused, presumably, by humans. But as Montford details in his book, the graph is incorrect.
[The author] had standardised the data by "short-centering" them -- essentially subtracting them from a 20th century average rather than an average of the whole period. This meant that the principal component analysis "mined" the data for anything with a 20th century uptick, and gave it vastly more weight than data indicating, say, a medieval warm spell.
Talk about an inconvenient truth.
Update: As expected, ye olde inbox is humming on this one. Here are a few places to look for the other other side of the story: Real Climate, Climate Progress (2, 3), New Scientist, and RealClimate. (thx, reed, barath, aaron)
After analyzing dozens of Hollywood films, a team of researchers has found evidence that the visual rhythm of movies at the shot level matches a pattern called the 1/f fluctuation, the same pattern that is found in dozens of natually occurring phenomena, including the length of the human attention span.
These results suggest that Hollywood film has become increasingly clustered in packets of shots of similar length. For example, action sequences are typically a cluster of relatively short shots, whereas dialogue sequences (with alternating shots and reverse-shots focused sequentially on the speakers) are likely to be a cluster of longer shots. In this manner and others, film editors and directors have incrementally increased their control over the visual momentum of their narratives, making the relations among shot lengths more coherent over a 70-year span.
Modern action movies are particularly adept at matching the audience's attention span in this manner. The full paper is available here.
In addition to sweet, salty, sour, bitter, and umami, Australian scientists have found evidence that humans can also taste fat.
"We found that the people who were sensitive to fat, who could taste very low concentrations, actually consumed less fat than the people who were insensitive," Keast told AFP. "We also found that they had lower BMIs (Body Mass Indexes)."
Maciej Ceglowski tells the story of how the cure for scurvy was discovered, lost, and finally redsicovered, but not before it disrupted Robert Falcon Scott's 1911 expedition to reach the South Pole.
This is a good example of how the very ubiquity of vitamin C made it hard to identify. Though scurvy was always associated with a lack of greens, fresh meat contains adequate amounts of vitamin C, with particularly high concentrations in the organ meats that explorers considered a delicacy. Eat a bear liver every few weeks and scurvy will be the least of your problems.
But unless you already understand and believe in the vitamin model of nutrition, the notion of a trace substance that exists both in fresh limes and bear kidneys, but is absent from a cask of lime juice because you happened to prepare it in a copper vessel, begins to sound pretty contrived.
A pair of companies have developed a bio-printer that works just like a regular 3-D printer but instead of using polymer, it uses human tissue to print out skin, blood vessels, and livers.
To start with, only simple tissues, such as skin, muscle and short stretches of blood vessels, will be made, says Keith Murphy, Organovo's chief executive, and these will be for research purposes. Mr Murphy says, however, that the company expects that within five years, once clinical trials are complete, the printers will produce blood vessels for use as grafts in bypass surgery. With more research it should be possible to produce bigger, more complex body parts. Because the machines have the ability to make branched tubes, the technology could, for example, be used to create the networks of blood vessels needed to sustain larger printed organs, like kidneys, livers and hearts.
(via @bobulate)
Over at Worldchanging, Alex Steffen calls Bill Gates' talk about climate change the most important speech ever given at TED. Gates said that the number one priority for him and the Gates Foundation (the world's largest philanthropic organization) is to combat human-driven climate change.
He reckons that because population is going to continue to grow for at least four decades, because billions of poor people want more equitable prosperity, and because (as he sees it) improvements in energy efficiency are limited, we have to focus on the last element of the equation, the carbon intensity of energy. Simply, we need climate-neutral energy. We need to use nothing but climate-neutral energy.
Using the Relativistic Heavy Ion Collider at the Brookhaven National Laboratory on Long Island, particle physicists have succeeded in creating quark-gluon plasma, the temperature of which is 4 trillion degrees Celsius (about 250,000 times hotter than the center of the Sun). The plasma is believed to be the state the universe was in a microsecond after its creation.
The departure from normal physics manifested itself in the apparent ability of the briefly freed quarks to tell right from left. That breaks one of the fundamental laws of nature, known as parity, which requires that the laws of physics remain unchanged if we view nature in a mirror.
This happened in bubbles smaller than the nucleus of an atom, which lasted only a billionth of a billionth of a billionth of a second. But in these bubbles were "hints of profound physics," in the words of Steven Vigdor, associate director for nuclear and particle physics at Brookhaven. Very similar symmetry-breaking bubbles, at an earlier period in the universe, are believed to have been responsible for breaking the balance between matter and its opposite antimatter and leaving the universe with a preponderance of matter.
A recent study indicates that the wing shapes of North American birds are changing in response to deforestation.
He found that over half of the species he examined demonstrated changes over time with boreal birds developing more pointed wings and temperate birds developing rounder wings. These results support the hypothesis that habitat isolation is spurring evolutionary changes in birds.
Boreal forests have suffered severe deforestation over the past century, and so Desrochers had predicted that increased distances between habitat patches would select for more pointed wings in birds. Pointed wings are associated with more energy-efficient sustained flight.
The discovery of stone tools that are possibly 130,000 years old on the island of Crete may indicate that humans were seafaring far earlier than is commonly believed.
Archaeologists and experts on early nautical history said the discovery appeared to show that these surprisingly ancient mariners had craft sturdier and more reliable than rafts. They also must have had the cognitive ability to conceive and carry out repeated water crossing over great distances in order to establish sustainable populations producing an abundance of stone artifacts.
Some scientists have developed a promising method for targeting and destroying individual cancer cells without harming the tissue around them. Tiny (like nano tiny) gold-plated iron-nickel discs are attached to cancer-seeking antibodies. The antibodies attach themselves to the cancer cells and when an alternating magnetic field is applied, the metal nano-discs vibrate and literally shake the cancer cells to death.
Since the antibodies are attracted only to brain cancer cells, the process leaves surrounding healthy cells unharmed. This makes them unlike traditional cancer treatment methods, such as chemotherapy and radiation, which negatively affect both cancer and normal healthy cells.
(thx, @richardjellis)
Were you to be close to a black hole, this program shows you what you might observe.
The optical appearance of the stellar sky for an observer in the vicinity of a black hole is dominated by bending of light, frequency shift, and magnification caused by gravitational lensing and aberration. Due to the finite apperture of an observer's eye or a telescope, Fraunhofer diffraction has to be taken into account. Using todays high performance graphics hardware, we have developed a Qt application which enables the user to interactively explore the stellar sky in the vicinity of a Schwarzschild black hole. For that, we determine what an observer, who can either move quasistatically around the black hole or follow a timelike radial geodesic, would actually see.
For Linux and Windows only, although there are sample videos for non-downloaders or those on other machines.
One of the big bummers about quantum computing is the cold temperatures required (hundreds of degrees below zero). However, a number of researchers believe that certain algae and bacteria perform quantum calculations at room temperature.
The evidence comes from a study of how energy travels across the light-harvesting molecules involved in photosynthesis. The work has culminated this week in the extraordinary announcement that these molecules in a marine alga may exploit quantum processes at room temperature to transfer energy without loss. Physicists had previously ruled out quantum processes, arguing that they could not persist for long enough at such temperatures to achieve anything useful.
(via mr)
In 1905, Einstein came up with the concept of special relativity, published his paper on the photoelectric effect, finished his doctoral dissertation, devised the E=mc^2 concept, published a paper on Brownian motion, was approved for his doctorate, and turned 26.
So......what have you guys been up to?
An experiment to detect gravitational waves may indicate that our universe is a holographic projection.
If this doesn't blow your socks off, then Hogan, who has just been appointed director of Fermilab's Center for Particle Astrophysics, has an even bigger shock in store: "If the GEO600 result is what I suspect it is, then we are all living in a giant cosmic hologram." [...] Our everyday experience might itself be a holographic projection of physical processes that take place on a distant, 2D surface.
My socks have been blown so far off they are in a parallel universe. We might be living in the shadow of Flatland. Read the whole thing...it's noodle-bending throughout. Reminds me of the discovery of cosmic background radiation. (via aegirthor)
Recent evidence of horizontal gene transfer -- in which genes are exchanged from other organisms, not from ancestors -- has some scientists thinking that the dominant form of evolution for most of the Earth's history was between non-related organisms and not among ancestors.
In the past few years, a host of genome studies have demonstrated that DNA flows readily between the chromosomes of microbes and the external world. Typically around 10 per cent of the genes in many bacterial genomes seem to have been acquired from other organisms in this way, though the proportion can be several times that. So an individual microbe may have access to the genes found in the entire microbial population around it, including those of other microbe species. "It's natural to wonder if the very concept of an organism in isolation is still valid at this level," says Goldenfeld.
Read on for their hypothesis about how horizontal evolution drove innovation -- development of a universal genetic code and genetic innovation-sharing protocols -- in life forms early on in the Earth's history. Fascinating.
Using brain scanning equipment and a cleverly designed interrogation technique, scientists have been able to ask questions of so-called vegetative patients; one of them even answered yes or no questions:
Several times when Subject 23 was asked to imagine playing tennis, Monti said, the region of the brain most closely associated with complex motor planning became highly active, and stayed active for 30 seconds after researchers prompted such imagery by saying "tennis."
Similarly, when researchers asked the patient to imagine walking through the house where he grew up and then said the word "navigate," Subject No. 23 responded with bursts of activity in the region of the brain involved in constructing and navigating a mental map.
The young, French-speaking man was the only subject who was then trained to answer simple yes or no questions -- whether his father's name was Paul (yes) or Alexander (no), whether he had siblings and how many -- using the imagery technique he had already learned.
Checking the patient's responses for accuracy and comparing them to the yes-no brain responses of a group of healthy volunteers, researchers discerned that Subject No. 23 was not only still "in there," but capable of purposeful thought and communication.
I really can't do a good job, any job, of explaining magnetic force in terms of something else you're more familiar with, because I don't understand it in terms of anything else you're more familiar with.
This is why science is so maddening for some and so great for others.
Kids can remember hundreds of Pokemon characters but very few animals. The solution? The Phylomon Project is an open source initiative aiming to make Pokemon-type cards for actual animals.
Update: Xeko is an "eco-adventure game" that features Pokemon-like cards for hundreds of real animals. (thx, josh)
In an excerpt from his recent book, The Greatest Show on Earth, Richard Dawkins writes about how wolves evolved into dogs first through self-domestication and then through domestication by humans.
We can imagine wild wolves scavenging on a rubbish tip on the edge of a village. Most of them, fearful of men throwing stones and spears, have a very long flight distance. They sprint for the safety of the forest as soon as a human appears in the distance. But a few individuals, by genetic chance, happen to have a slightly shorter flight distance than the average. Their readiness to take slight risks -- they are brave, shall we say, but not foolhardy -- gains them more food than their more risk-averse rivals. As the generations go by, natural selection favours a shorter and shorter flight distance, until just before it reaches the point where the wolves really are endangered by stonethrowing humans. The optimum flight distance has shifted because of the newly available food source.
(via @linklog)
David Dobbs tells us about a new theory in genetics called the orchid hypothesis that suggests that the genes that underlie some of the most troubling human behaviors -- violence, depression, anxiety -- can, in combination with the right environment, also be responsible for our best behaviors.
Most of us have genes that make us as hardy as dandelions: able to take root and survive almost anywhere. A few of us, however, are more like the orchid: fragile and fickle, but capable of blooming spectacularly if given greenhouse care. So holds a provocative new theory of genetics, which asserts that the very genes that give us the most trouble as a species, causing behaviors that are self-destructive and antisocial, also underlie humankind's phenomenal adaptability and evolutionary success. With a bad environment and poor parenting, orchid children can end up depressed, drug-addicted, or in jail -- but with the right environment and good parenting, they can grow up to be society's most creative, successful, and happy people.
From start to finish, this is one of the most interesting things I've read in weeks.
Today on xkcd, an illustration showing the gravity wells of our solar system's planets and some of their moons.
Two of Mars' tiny moons barely have any gravity at all:
You could escape Deimos with a bike and a ramp. A thrown baseball could escape Phobos.
That's great, but you forgot Pluto!
The logistics of fighting wars in space is a little different than the movies have lead us to believe.
For the same reason that we have Space Shuttle launch delays, we'll be able to tell exactly what trajectories our enemies could take between planets: the launch window. At any given point in time, there are only so many routes from here to Mars that will leave our imperialist forces enough fuel and energy to put down the colonists' revolt.
In 2004, the Hubble Space Telescope took an image called the Hubble Ultra Deep Field; basically astronomers pointed the Hubble toward an "empty" part of space and took a long-exposure shot in the visible spectrum. What they found were thousands of far away galaxies from early in the development of the universe. Now the Hubble has peered even deeper into the universe in near-infrared and captured this image:
Each one of those little specks is an entire galaxy, some only 600 million years old. Here's a zoomed-in section:
How did whales get so big eating such tiny creatures? And why aren't they bigger? Carl Zimmer explains.
According to the scientists, this pattern occurs when the whales lunge into a cloud of krill and drop open their jaws. Pleats under the lower jaw open up, engulfing huge amounts of water. The whale slows down because of the drag. It behaves, in other words, a lot like a parachute. [...] It's a lot of water, the scientists have found: in one lunge, a fin whale can momentarily double its weight.
The scaling stuff later on in the article is especially interesting. See also The Biology of B-Movie Monsters.
The most striking feature of the H1N1 flu vaccine manufacturing process is the 1,200,000,000 chicken eggs required to make the 3 billion doses of vaccine that may be required worldwide. There are entire chicken farms in the US and around the world dedicated to producing eggs for the purpose of incubating influenza viruses for use in vaccines. No wonder it takes six months from start to finish. But we'll get to that in a minute.
The most commonly used process for manufacturing an influenza vaccine was developed in the 1940s -- one of its co-inventors was Jonas Salk, who would go on to develop the polio vaccine -- and has remained basically unchanged since then. The process is coordinated by the World Health Organization and begins with the detection of a new virus (or rather one that differs significantly from those already going around); in this instance, the Pandemic H1N1/09 virus. Once the pandemic strain has been identified and isolated, it is mixed with a standard laboratory virus through a technique called genetic reassortment, the purpose of which is to create a hybrid virus (also called the "reference virus strain") with the pandemic strain's surface antigens and the lab strain's core components (which allows the virus to grow really well in chicken eggs). Then the hybrid is tested to make sure that it grows well, is safe, and produces the proper antigen response. This takes about six to nine weeks.
[Quick definitional pause. Antigen: "An antigen is any substance that causes your immune system to produce antibodies against it. An antigen may be a foreign substance from the environment such as chemicals, bacteria, viruses, or pollen. An antigen may also be formed within the body, as with bacterial toxins or tissue cells." So, when the H1N1 vaccine gets inside your body, the pandemic strain's surface antigens will produce antibodies against it.]
At roughly the same time, a parallel effort to produce what are referred to as reference reagents is undertaken. The deliverable here is a standardized kit provided to vaccine manufacturers so that they can test how much virus they are making and how effective it is. This process serves to standardize vaccine doses across manufacturers and takes four months to complete. WHO notes that this part of the process is "often a bottleneck to the overall timeline for manufacturers to generate the vaccine".
Once the reference virus strain is produced, it is sent to pharmaceutical companies (Novartis, Sanofi Pasteur, etc.) for large-scale production of the vaccine. The companies fine-tune the virus to increase yields and produce seed virus banks that will be used in the bulk production.
And this is where the 1.2 billion chicken eggs come in. A portion of the seed virus is injected into each 9- to 12-day old fertilized egg. The virus incubates in the egg white for two to three days and is then separated from the egg.
For the shot vaccine, the virus is sterilized so that it won't make anyone sick. This is the magic part of the vaccine: it's got the pandemic virus antigens that make your body produce the antibodies to fight the virus but the virus is inactive so it won't make you ill. For the nasal spray vaccine, the virus is left alive and attenuated to survive only in the nose and not the warmer lungs; it'll infect you enough to produce antibodies but not enough to make you sick. Either way, the surface antigens are separated out and purified to produce the active ingredient in the vaccine. Each batch of antigen takes about two weeks to produce. With enough laboratory space and chicken eggs, the companies can crank out an infinite amount of purified antigens, but those resources are limited in practice.
[Side note. You may have noticed that the H1N1 vaccine has been difficult to find in some places around the US. The vaccine manufacturers have said that the Pandemic H1N1/09 virus when combined with the standard laboratory virus does not grow as fast in the eggs as they anticipated. The batches of antigens from each egg have been smaller than expected, up to five or even ten times smaller in some cases. Hence the slow rollout of the vaccine.]
The purified antigen is then tested against the aforementioned reference reagents once they are ready. The antigen is diluted to the required concentration and placed into properly labelled vials or syringes. Further testing is performed to make sure the vaccine won't make anyone ill, to confirm the correct concentration, and for general safety. At this point clinical testing in humans is required in western Europe but not in the United States. Finally, each company's vaccine has to be approved by the appropriate regulatory body in each country -- that's the FDA in the case of the US -- and then the vaccine is distributed to medical facilities around the country.
Sources and more information: WHO, WHO, WHO, WHO, CDC, Time, Washington Post, The Big Picture, Influenza Report, NPR, Wikipedia, Wikipedia, Wikipedia, Wikipedia.
Update: Included in a recent 60 Minutes segment on the H1N1 vaccine is a look at the manufacturing process. (thx, @briandigital)
With regard to the Large Hadron Collider, the Higgs boson gets all the press but other potential discoveries could be more exciting and easier to detect.
However, if the theorists are right, before it ever finds the Higgs, the LHC will see the first outline of something far bigger: the grand, overarching theory known as supersymmetry. SUSY, as it is endearingly called, is a daring theory that doubles the number of particles needed to explain the world. And it could be just what particle physicists need to set them on the path to fresh enlightenment.
If you haven't been keeping up with particle physics for the past few years (as I haven't), this will bring you up to speed a bit.
Nathan Myhrvold, ex-Microsoftie and founder of an invention company called Intellectual Ventures, is also really interested in food, so much so that he's writing a monster cookbook (currently ~1500 pages) about the science of cooking.
In another discovery of culinary heat transfer physics, Dr. Myhrvold said the bulbous shape and black color of Weber grills were wrong. To achieve an even cooking temperature across the cooking grate, the inside of the grill should be vertical and shiny to reflect the heat. That can be fixed by adding an aluminum insert to the grill. "So we have directions for that," Dr. Myhrvold said.
You may remember reading about Myhrvold and IV in Malcolm Gladwell's piece on the nature of invention last year.
NASA announced that it has found pretty hard evidence of significant amounts of water on the Moon.
"We are ecstatic," said Anthony Colaprete, LCROSS project scientist and principal investigator at NASA's Ames Research Center in Moffett Field, Calif. "Multiple lines of evidence show water was present in both the high angle vapor plume and the ejecta curtain created by the LCROSS Centaur impact. The concentration and distribution of water and other substances requires further analysis, but it is safe to say Cabeus holds water."
I don't have to tell you about the implications here. Just think of how much you could sell authentic Moon bottled water for.
When you shoot video of water drops falling into a puddle in super slow motion, it turns out that they bounce in really interesting ways.
(via 3qd)
In a New Yorker book review this week, Elizabeth Kolbert tears Levitt and Dubner a new one over the geoengineering chapter of SuperFreakonomics, calling the pair's thinking on the issue "horseshit".
Given their emphasis on cold, hard numbers, it's noteworthy that Levitt and Dubner ignore what are, by now, whole libraries' worth of data on global warming. Indeed, just about everything they have to say on the topic is, factually speaking, wrong. Among the many matters they misrepresent are: the significance of carbon emissions as a climate-forcing agent, the mechanics of climate modelling, the temperature record of the past decade, and the climate history of the past several hundred thousand years.
Researchers have been able to create new human senses of a sort...and to cross-pollinate two different senses in order to, for example, see with your tongue.
With Arnoldussen behind me carrying the laptop, I walked around the Wicab offices. I managed to avoid most walls and desks, scanning my head from side to side slowly to give myself a wider field of view, like radar. Thinking back on it, I don't remember the feeling of the electrodes on my tongue at all during my walkabout. What I remember are pictures: high-contrast images of cubicle walls and office doors, as though I'd seen them with my eyes.
I am reminded of magnetic fingers and the boy who sees through echolocation. I wouldn't mind a sense of maps that worked via smell...follow the cinnamon scent to your destination or some such.
Several naturally occurring nuclear reactors have been discovered in Gabon, Africa. Groundwater flooding deposits of uranium ore made the reaction possible.
The natural nuclear reactor formed when a uranium-rich mineral deposit became inundated with groundwater that acted as a neutron moderator, and a nuclear chain reaction took place. The heat generated from the nuclear fission caused the groundwater to boil away, which slowed or stopped the reaction. After cooling of the mineral deposit, short-lived fission product poisons decayed, the water returned and the reaction started again. These fission reactions were sustained for hundreds of thousands of years, until a chain reaction could no longer be supported. Fission of uranium normally produces five known isotopes of the fission-product gas xenon; all five have been found trapped in the remnants of the natural reactor, in varying concentrations. The concentrations of xenon isotopes, found trapped in mineral formations 2 billion years later, make it possible to calculate the specific time intervals of reactor operation: approximately 2 hours and 30 minutes
Nice try Fermi, but Mother Nature got there first.
BTW, despite reading The Making of the Atomic Bomb (twice!), I can't recall hearing this pair of anecdotes before:
Due to a mistranslation, Soviet reports on Enrico Fermi claimed that his work was performed in a converted "pumpkin field" instead of a "squash court", squash being an offshoot of hard racquets.
When the first self-sustained nuclear chain reaction was achieved, a coded phone call was made by one of the physicists, Arthur Compton, to James Conant, chairman of the National Defense Research Committee. The conversation was in impromptu code:
Compton: The Italian navigator has landed in the New World.
Conant: How were the natives?
Compton: Very friendly.
Pumpkin field, tube alloy, the Italian navigator, the Manhattan Project...the building of the atomic bomb had no shortage of fanciful language.
Update: BLDGBLOG did a post on fossil reactors recently, which is probably where I got the link above in the first place.
The process of inoculation against diseases like smallpox has been known for at least 1200 years. An 8th-century Indian book contains a how-to chapter on smallpox inoculations. Chinese use of the technique dates back to the first millennium as well. The technique was imported to Europe via the Ottoman Empire in 1721 and reached America at about the same time.
The practice is documented in America as early as 1721, when Zabdiel Boylston, at the urging of Cotton Mather, successfully inoculated two slaves and his own son. Mather, a prominent Boston minister, had heard a description of the African practice of inoculation from his Sudanese slave, Onesimus, in 1706, but had been previously unable to convince local physicians to attempt the procedure. Following this initial success, Boylston began performing inoculations throughout Boston, despite much controversy and at least one attempt upon his life. The effectiveness of the procedure was proven when, of the nearly three hundred people Boylston inoculated during the outbreak, only six died, whereas the mortality rate among those who contracted the disease naturally was one in six.
In a criticism of inoculation that would not seem so out of place regarding vaccination today, Voltaire takes his countrymen to task for not inoculating their children.
It is inadvertently affirmed in the Christian countries of Europe that the English are fools and madmen. Fools, because they give their children the small-pox to prevent their catching it; and madmen, because they wantonly communicate a certain and dreadful distemper to their children, merely to prevent an uncertain evil. The English, on the other side, call the rest of the Europeans cowardly and unnatural. Cowardly, because they are afraid of putting their children to a little pain; unnatural, because they expose them to die one time or other of the small-pox. But that the reader may be able to judge whether the English or those who differ from them in opinion are in the right, here follows the history of the famed innoculation, which is mentioned with so much dread in France.
Once a month, Maggie Koerth-Baker will answer a science question from a toddler. First up: Do turtles have eyelashes?
At a recent conference, a group of physicists talked about the biggest answered (and perhaps unanswerable) questions in physics. Three of the questions are:
What is everything made of?
Will string theory ever be proved correct?
How far can physics take us?
Wired has a long piece by Amy Wallace about the anti-science anti-vaccine crowd.
Ah, risk. It is the idea that fuels the anti-vaccine movement -- that parents should be allowed to opt out, because it is their right to evaluate risk for their own children. It is also the idea that underlies the CDC's vaccination schedule -- that the risk to public health is too great to allow individuals, one by one, to make decisions that will impact their communities. (The concept of herd immunity is key here: It holds that, in diseases passed from person to person, it is more difficult to maintain a chain of infection when large numbers of a population are immune.)
Update: I am on Team Tom Scocca on this issue:
Anti-vaccine activists are degenerate idiots who deserve to get polio and live out their days in iron lungs while Child Protective Services takes away their children to be properly raised. Or tetanus. Get lockjaw and shut up and die. What's the point of living in 21st-century America if not to avoid dying of stupid, easily preventable disease?
And Slate has an article about the effects of unvaccinated children on those with weak immune systems.
Ordinarily I wouldn't question others' parenting choices. But the problem is literally one of live or don't live. While that parent chose not to vaccinate her child for what she likely considers well-founded reasons, she is putting other children at risk. In this instance, the child at risk was my son. He has leukemia.
(thx, cedar)
Update: Ben Goldacre on anti-vaccine scares as a cultural thing, not a science thing:
There's something very interesting about vaccine scares. These are cultural products. They're not about evidence. If vaccine scares were about genuine scientific evidence showing that a vaccine caused a disease, then the vaccine scares would happen all around the world at exactly the same time, because information can disseminate itself around the world very rapidly these days. But what you find is that vaccine scares actually respect cultural and national boundaries.
(via lined and unlined)
100 years of visualizing the brain, from the discovery of neurons in the 19th century to MRI investigations in the 1990s.
Participants in a sensory deprivation experiment reported having hallucinations after just fifteen minutes.
They then put the participants, one by one, in a dark anechoic chamber which shields all incoming sounds and deadens any noise made by the participant. The room had a 'panic button' to stop the experiment but apparently no-one needed to use it.
(via wired)
Are the problems that have plagued the Large Hadron Collider and previous high-energy efforts (SSC, I'm looking at you here) a result of the Higgs boson travelling back from the future to meddle in its own discovery? A pair of scientists think it's a possibility.
"It must be our prediction that all Higgs producing machines shall have bad luck," Dr. Nielsen said in an e-mail message. In an unpublished essay, Dr. Nielson said of the theory, "Well, one could even almost say that we have a model for God." It is their guess, he went on, "that He rather hates Higgs particles, and attempts to avoid them."
This malign influence from the future, they argue, could explain why the United States Superconducting Supercollider, also designed to find the Higgs, was canceled in 1993 after billions of dollars had already been spent, an event so unlikely that Dr. Nielsen calls it an "anti-miracle."
That's heavy, Doc.
Update: Bread from the future halted operation of the LHC again.
Not every magnetic substance has a north and a south pole...some are monopolar.
The work is the first to make use of the magnetic monopoles that exist in special crystals known as spin ice.
Spin ice! Also I guess they went with the awkward magnetricity name because electromagnetism was taken. (via mouser, who says "Suck it, Maxwell")
Using Michael Vick as a pivot, Malcolm Gladwell compares professional football with dogfighting and asks if the former is just as morally unacceptable as the latter. This is former NFL offensive lineman Kyle Turley:
I remember, every season, multiple occasions where I'd hit someone so hard that my eyes went cross-eyed, and they wouldn't come uncrossed for a full series of plays. You are just out there, trying to hit the guy in the middle, because there are three of them. You don't remember much. There are the cases where you hit a guy and you'd get into a collision where everything goes off. You're dazed. And there are the others where you are involved in a big, long drive. You start on your own five-yard line, and drive all the way down the field-fifteen, eighteen plays in a row sometimes. Every play: collision, collision, collision. By the time you get to the other end of the field, you're seeing spots. You feel like you are going to black out. Literally, these white explosions-boom, boom, boom-lights getting dimmer and brighter, dimmer and brighter.
Perhaps this is what Gladwell will be talking about at the upcoming New Yorker Festival?
Update: From Stephen Fatsis, a list of improvements for the NFL players union to consider to protect the health of the players.
N.F.L. players often get excellent medical treatment, but the primary goal is to return them to the field as quickly as possible. Players are often complicit in playing down the extent of their injuries. Fearful of losing their jobs -- there are no guaranteed contracts in the N.F.L. -- they return to the huddle still hurt.
And from GQ comes a profile of Bennet Omalu, one of the few doctors investigating the fate of these NFL players.
Let's say you run a multibillion-dollar football league. And let's say the scientific community -- starting with one young pathologist in Pittsburgh and growing into a chorus of neuroscientists across the country -- comes to you and says concussions are making your players crazy, crazy enough to kill themselves, and here, in these slices of brain tissue, is the proof. Do you join these scientists and try to solve the problem, or do you use your power to discredit them?
Update: Commissioner Roger Goodell defended the NFL's handling of head trauma in a hearing before the House Judiciary Committee today.
Goodell faced his harshest criticism from Representative Maxine Waters, Democrat of California, who called for Congress to revoke the league's antitrust exemption because of its failure to care adequately for injured former players. "I believe you are an $8 billion organization that has failed in your responsibility to the players," Waters said. "We all know it's a dangerous sport. Players are always going to get injured. The only question is, are you going to pay for it? I know that you dearly want to hold on to your profits. I think it's the responsibility of Congress to look at your antitrust exemption and take it away."
Update: The NFL will soon require players with head injuries to receive advice from independent neurologists.
A video of the Leucochloridium parasite infecting a snail.
The worm is consumed by the snail, and begins its development in the snail digestive tract. Once it grows and matures, it moves into the snail's optical tentacles, where it will pulsate and writhe as an example of aggressive mimicry, turning the tentacle into a dead-ringer for a caterpillar larvae, and making the snail a visible snack to a passing bird. The worm's dance is also deadly because it renders the snail insensitive to light, making it incapable of shielding itself from predators. After the bird eats the infected snail, the worm matures fully inside the bird's digestive tract, there it reproduces and lays eggs. Once the bird excretes the Leucochloridium larva, it is consumed by snails, thus continuing its life cycle.
Seven new species of phosphorescent mushrooms have been discovered, bringing the grand total of documented glowing fungi species to 71. The new discoveries join the ranks of the other luminous mushrooms that produce light as a result of a chemical reaction. Although easily noticeable at night, phosphorescent mushrooms glow all day long. Ten new fungi species were documented between 2002 and 2006, which is surprising considering how difficult it is to write in the dark.
Scientists discovered that it's likely that some individuals with high testosterone actually perceive other people's anger as a reward. Researchers tested the subjects' testosterone levels and assigned them "learning tasks" where images of faces were subliminally flashed in response to their performance. Participants who had higher testosterone levels responded better to angry faces than to neutral ones, even though the faces were on screen too briefly to identify. Michelle Wirth, who led the study, explained how this can possibly be correlated to other testing methods:
"Better learning of a task associated with anger faces indicates that the anger faces were rewarding, as in a rat that learns to press a lever in order to receive a tasty treat. In that sense, anger faces seemed to be rewarding for high-testosterone people, but aversive for low-testosterone people."
So the next time it seems like that person is trying to piss you off, reward them with a knuckle sandwich.
Just in time for Halloween: a new study theorizes that eating too many Pez will land children in the pen. Researchers believe that using candy as a reward for a chore such as homework drives children to have difficulty handling anything but immediate gratification. The dopamine release that is caused by consuming sugar, and the inherent "addiction" that it causes, can lead to impulsive behavior when treats are withheld from kids. It's the inability to successfully cope with delayed gratification that has doctors concerned, since rash behavior in children can be linked to criminal acts and violence in adults. The British study, which followed 17,000 children over four decades, found that, by the age of 34, 69% of daily candy eaters were apprehended for violent acts. Perhaps it's the prevalence of penny candies that leads people to the penitentiary.
Update: It's all in the subtleties. The article reads:
"The October 2009 study revealed that 69 per cent of those with a criminal record of violence consumed candy daily as children."
This means that it can be inferred that those who have committed crime had sweet teeth as kids, but not that children who eat candy every day will therefore be predisposed to criminal behavior. Moreover, there are so many variables and unobserved factors that if you eliminated the sugary rewards, it wouldn't necessarily mean a correlated drop in crime. It isn't the candy that's causing the trouble, it's just that trouble-making and candy seem to be bedfellows. So much for trick or treat. (thx, neil and scott)
Flying in the shape of a "v" allows geese to have an equal field of vision while conserving energy, using wingtip vortices to decrease any drag in flight. The bird in the front is working the hardest, but when the leader grows weary it rotates to a position farther back and allows another feathered pilot to take its place. This formation is so successful in conserving energy that birds who fly in "v" formations have been recorded to have lower heart rates than those who do not. If one of the birds flies out of formation, they will feel the increase in drag nudging them back into position. Perhaps most impressive, if a bird in the formation falls ill or is shot, two other birds will accompany it on the descent, aiding and protecting the injured bird until it either recovers or dies. The two helpful geese will then rejoin the formation.
Nothing like a little science on the Moon, I always say.
Astronaut David Scott in 1971, from the Apollo 15 Lunar Surface Journal. Scott was part of the Apollo 15 crew, and applied Galileo's findings about gravity and mass by testing a falcon feather and a hammer. The film, shown in countless high school physics classes, is the nerdy, oft-neglected cousin of Neil Armstrong's space paces.
A new study concludes that babies and dogs do not have an advanced ability to read social cues, but that wolves do. Using a hiding-and-finding game, scientists at University of Iowa and Indiana University have concluded that babies and dogs are distracted by social cues such as adults' facial expressions and vocal interactions, and that they don't have a unique or enhanced ability to recall where an object is hidden simply based on social cues alone. Wolves, and older babies, performed better in the study, and were more capable of remembering where the object was hidden. Professor John Spencer, who was at the helm of the research, understands that this could be a difficult fact for parents and pet owners to accept.
"In our view, this is something to celebrate -- that we can bring social cognition together with basic cognitive processes. The downside, of course, is that infants, and by analogy dogs, don't have a special mind-reading ability. For some people, that's an unpleasant pill to swallow."
The study was in direct response to one from the Hungarian Academy of Sciences last year, which had found that babies were quite apt at object recall based when the experimenters interacted with them. The oppositional findings raise an interesting question when it comes to our newest arrivals' cleverness. It remains to be seen how good wolves are at Memory.
Internet, meet Ardi, the newest member of the human branch of the primate family tree.
Or rather, the oldest. Discovered in Ethiopia in 1994, Ardi is a 4.4 million-year-old partial skeleton of a female Ardipithecus ramidus.
The fossil puts to rest the notion, popular since Darwin's time, that a chimpanzee-like missing link -- resembling something between humans and today's apes -- would eventually be found at the root of the human family tree. Indeed, the new evidence suggests that the study of chimpanzee anatomy and behavior -- long used to infer the nature of the earliest human ancestors -- is largely irrelevant to understanding our beginnings.
Ardi instead shows an unexpected mix of advanced characteristics and of primitive traits seen in much older apes that were unlike chimps or gorillas. As such, the skeleton offers a window on what the last common ancestor of humans and living apes might have been like.
This is a major discovery; Science is devoting a special issue to the find with 11 detailed peer-review papers and general summaries. I expect we'll be hearing more about this in the coming weeks as all that science filters through the lay media. (thx, jeff)
The Spanish ribbed newt has an interesting method of dealing with perceived threats. The creature activates its ribcage like mini switchblades, forcing them through its own skin. Even more remarkable, the newt's highly adapted immune system and collagen-cased bones allow it to heal quickly and without risk of infection, which makes it one job interview away from a position with the X-Men.
In 1907, Dr. Duncan MacDougall found a bunch of people who were about to die and weighed them as they expired. MacDougall claimed that at the point of death, the bodies became lighter. That lost weight, the doctor assumed, was the escaping soul. He even postulated that the souls of the sluggish in life are slow in death:
The subject was that of a man of larger physical build, with a pronounced sluggish temperament. When life ceased, as the body lay in bed upon the scales, for a full minute there appeared to be no change in weight. The physicians waiting in the room looked into each other's faces silently, shaking their heads in the conviction that out test had failed.
Then suddenly the same thing happened that had occurred in the other cases. There was a sudden diminution in weight, which was soon found to be the same as that of the preceding experiments.
I believe that in this case, that of a phlegmatic man slow of thought and action, that the soul remained suspended in the body after death, during the minute that elapsed before it came to the consciousness of its freedom. There is no other way of accounting for it, and it is what might be expected to happen in a man of the subject's temperament.
The weight lost of MacDougall's first subject at death was 3/4 of an ounce...or about 21 grams. (via radiolab)
To the alarm of the big pharmaceutical companies, the placebo effect appears to be getting stronger. The reasons are many and interesting.
It's not only trials of new drugs that are crossing the futility boundary. Some products that have been on the market for decades, like Prozac, are faltering in more recent follow-up tests. In many cases, these are the compounds that, in the late '90s, made Big Pharma more profitable than Big Oil. But if these same drugs were vetted now, the FDA might not approve some of them. Two comprehensive analyses of antidepressant trials have uncovered a dramatic increase in placebo response since the 1980s. One estimated that the so-called effect size (a measure of statistical significance) in placebo groups had nearly doubled over that time.
New Scientist reports that Czech beer tastes worse than it used to due to climate change.
Climatologist Martin Mozny of the Czech Hydrometeorological Institute and colleagues say that the quality of Saaz hops -- the delicate variety used to make pilsner lager -- has been decreasing in recent years. They say the culprit is climate change in the form of increased air temperature.
Winemaking regions are shifting due to climate change as well.
Nicola Twilley proposes a Climate Change Tasting Menu that highlights food and drink demonstrating the effects of human activities on climate.
The starter would feature new products that have only recently been cultivated locally, thanks to climate change -- Devon olive oil perhaps, accompanied by a nice glass of Kent rosé. The main course might be controversial: test-tube grown imitation meats and vegetables that recreate the flavour and mouthfeel of species that are already lost or threatened with extinction by climate change.
The answer to this Fermi problem is a bit surprising.
Assuming you're not in a big lecture hall and the professor shuts the door at the start of class, how long does it take for you and your classmates to deplete the oxygen enough to feel it?
Here's a taste of the reasoning behind the answer:
So one person needs about 2lb of oxygen a day, or .9 kg. But how many liters is that? Oxygen has a molar mass of 16 grams, so oxygen gas, or O2, has a mass of 32 grams per mole. One mole of gas at standard pressure and temperature takes up 22.4 liters.
A commenter over on Fine Structure notes that CO2 is more of a problem than oxygen.
I don't know if they brought this up on physicsbuzz yet, but lack of oxygen isn't really uncomfortable (though it can kill you). Increase in CO2 is what triggers the apparent need to breath. I am pretty sure the minimum partial pressure of O2 is around 0.16 bar. Actually, that is the min recommended, I don't know if that is the pass-out limit.
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