In an article for Scientific American, two scientists who are working on the causes of colony collapse disorder (CCD) say that they and other researchers have made some progress in determining what’s killing all of those bees.
The growing consensus among researchers is that multiple factors such as poor nutrition and exposure to pesticides can interact to weaken colonies and make them susceptible to a virus-mediated collapse. In the case of our experiments in greenhouses, the stress of being confined to a relatively small space could have been enough to make colonies succumb to IAPV and die with CCD-like symptoms.
It’s like AIDS for bees…the lowered immunity doesn’t kill directly but makes the bees more susceptible to other illness. One the techniques researchers used in investigating CDD is metagenomics. Instead of singling out an organism for analysis, they essentially mixed together a bunch of genetic material found in the bees (including any bacteria, virii, parasites, etc.) and sliced it up into small pieces that were individually deciphered. They went through those pieces one by one and assigned them to known organisms until they ran across something unusual.
The CSI-style investigation greatly expanded our general knowledge of honeybees. First, it showed that all samples (CCD and healthy) had eight different bacteria that had been described in two previous studies from other parts of the world. These findings strongly suggest that those bacteria may be symbionts, perhaps serving an essential role in bee biology such as aiding in digestion. We also found two nosema species, two other fungi and several bee viruses. But one bee virus stood out, as it had never been identified in the U.S.: the Israeli acute paralysis virus, or IAPV.
[Cosmos] covered a wide range of scientific subjects including the origin of life and a perspective of our place in the universe. The series was first broadcast by the Public Broadcasting Service in 1980, and was the most widely watched series in the history of American public television until 1990’s The Civil War. It is still the most widely watched PBS series in the world. It won an Emmy and a Peabody Award and has since been broadcast in more than 60 countries and seen by over 600 million people, according to the Science Channel.
- Only 53% of adults know how long it takes for the Earth to revolve around the Sun. - Only 59% of adults know that the earliest humans and dinosaurs did not live at the same time. - Only 47% of adults can roughly approximate the percent of the Earth’s surface that is covered with water.* - Only 21% of adults answered all three questions correctly.
I bet this got cumulatively 10 seconds of coverage on the major “news” networks, if that. Compare with the endless airtime given to this AIG business and then pull your hair out until you resemble Bruce Willis. (via clusterflock)
“There’s nothing balanced here. It’s completely, 100 percent evolution-based,” said DeWitt, a professor of biology. “We come every year, because I don’t hold anything back from the students.”
Creationists, who take their view of natural history straight from the book of Genesis, believe that scientific data can be interpreted to support their idea that God made the first human, Adam, in an essentially modern form 6,000 to 10,000 years ago.
A 2006 poll by the Pew Forum on Religion & Public Life found that 42 percent of Americans believe humans have always existed in their present form. At universities such as Liberty, founded by the late Jerry Falwell, those views inform the entire science curriculum.
The reality in question — admittedly rather a small part of the universe — was the polarisation of pairs of photons, the particles of which light is made. The state of one of these photons was inextricably linked with that of the other through a process known as quantum entanglement. The polarised photons were able to take the place of the particle and the antiparticle in Dr Hardy’s thought experiment because they obey the same quantum-mechanical rules. Dr Yokota (and also Drs Lundeen and Steinberg) managed to observe them without looking, as it were, by not gathering enough information from any one interaction to draw a conclusion, and then pooling these partial results so that the total became meaningful.
That’s a relief, although the head of one of the group called their results “preposterous”, so perhaps we’re still not really here.
Note: the drinking bird is not a perpetual motion machine. But it is a heat engine. Here’s how it works:
The water evaporates from the felt on the head (Maxwell-Boltzmann distribution). Evaporation lowers the temperature of the glass head (heat of vaporization). The temperature’s drop causes some of the dichloromethane vapor in the head to condense. The lower temperature and condensation together cause the pressure to drop in the head (ideal gas law). The pressure differential between the head and base causes the liquid to be pushed up from the base. As liquid flows into the head, the bird becomes top heavy and tips over during its oscillations. When the bird tips over, the bottom end of the neck tube rises above the surface of the liquid. A bubble of vapor rises up the tube through this gap, displacing liquid as it goes. Liquid flows back to the bottom bulb, and vapor pressure equalizes between the top and bottom bulbs. The weight of the liquid in the bottom bulb restores the bird to its vertical position. The liquid in the bottom bulb is heated by ambient air, which is at a temperature slightly higher than the temperature of the bird’s head.
This review of Superorganism, a new book by Bert Hölldobler and Edward O. Wilson, is chock full of fascinating facts about ant societies and how they organize themselves.
The progress of ants from this relatively primitive state to the complexity of the most finely tuned superorganisms leaves no doubt that the progress of human evolution has largely followed a path taken by the ants tens of millions of years earlier. Beginning as simple hunter-gatherers, some ants have learned to herd and milk bugs, just as we milk cattle and sheep. There are ants that take slaves, ants that lay their eggs in the nests of foreign ants (much like cuckoos do among birds), leaving the upbringing of their young to others, and there are even ants that have discovered agriculture. These agricultural ants represent the highest level of ant civilization, yet it is not plants that they cultivate, but mushrooms.
You may remember reading the New Yorker article on Garrett Lisi, a surfer, physicist, and snowboarder who came out of nowhere in 2007 to present a plausible Theory of Everything, “a unifying idea that aims to incorporate all the universe’s forces in a single mathematical framework”. I do but I missed this visualization of Lisi’s theory posted by New Scientist in late 2007. You may want to break out the bong for this one. (thx, matt)
Considering they can’t wield a knife or cleaver, dolphins make impressive butchers. Researchers in Australia recently observed a bottlenose performing a precise series of manoeuvres to kill, gut and bone a cuttlefish. The six-step procedure gets rid of the invertebrate’s unappetising ink and hard-to-swallow cuttlebone.
Scientists are still trying to figure out what’s causing CCD, or Colony Collapse Disorder, a plague that’s killing off millions of bee across the United States. Among the possible culprits are a virus, increased vulnerability to disease due to breeding, overwork (hives of bees are trucked around the country for months to pollinate crops), increased exposure to all kinds of insecticides, and perhaps even all of the above.
As the swift expansion of feral honeybees across the Americas shows, they are not especially picky about their habitat; most anything outside of parking lot or vast monoculture will do. And for native bees, habitat could be restored to suit the needs of whichever species are exceptionally good pollinators of local crops. Bumblebees, for instance, are the best pollinators of Maine blueberries, whereas blue orchard bees work well for California almonds.
Hirsh’s idea is reminiscent of Michael Pollan’s proposals for decreasing the present monoculture in American agriculture outlined in his recent books.
Telling the magazine that he was asked why he did not give “credit” to God, Attenborough added: “They always mean beautiful things like hummingbirds. I always reply by saying that I think of a little child in east Africa with a worm burrowing through his eyeball. The worm cannot live in any other way, except by burrowing through eyeballs. I find that hard to reconcile with the notion of a divine and benevolent creator.”
Remarkable photo of a gynandromorphic cardinal with bilateral asymmetry, meaning that the left side of the bird is male and the right side is female…a red/brown split right down the middle.
Let me point to the Adjacent Possible of the biosphere. Once there were lung fish, swim bladders were in the Adjacent Possible of the biosphere. Before there were multicelled organisms, the swim bladder was not in the Adjacent Possible of the biosphere. Something wonderful is happening right in front of us: When the swim bladder arose it was of selective advantage in its context. It changed what was Actual in the biosphere, which in turn created a new Adjacent Possible of the biosphere. The biosphere self consistently co-constructs itself into its every changing, unstatable Adjacent Possible.
If the becoming of the swim bladder is partially lawless, it certainly is not entailed by the fundamental laws of physics, so cannot be deduced from physics. Then its existence in the non-ergodic universe requires an explanation that cannot be had by that missing entailment. The universe is open.
We determined that, generally speaking, the gravity in each Mario game, as game hardware has increased, is getting closer to the true value of gravity on earth of 9.8 m/s^2. However, gravity, even on the newest consoles, is still extreme.
In Super Mario 2, Mario experiences a g-force of 11 each time he falls from a ledge, a force that would cause mere humans to black out. In Madden 2006, the game’s fastest cornerbacks can run the 40 in 2.6 seconds. (via waxy)
In a surprisingly under-reported story from 2007, Mark Holley, a professor of underwater archaeology at Northwestern Michigan University College, discovered a series of stones - some of them arranged in a circle and one of which seemed to show carvings of a mastodon — 40-feet beneath the surface waters of Lake Michigan. If verified, the carvings could be as much as 10,000 years old — coincident with the post-Ice Age presence of both humans and mastodons in the upper midwest.
Aired a few weeks before the 2008 election, The President’s Guide to Science is a 50-minute video featuring several prominent scientists — Richard Dawkins, Michio Kaku, etc. — offering their advice for the incoming US President, basically what they would teach the President about science. (via smashing telly)
The cycle of photosynthesis is the cycle of life, says science journalist Morton (Mapping Mars). Green leaves trap sunlight and use it to absorb carbon dioxide from the air and emit life-giving oxygen in its place. Indeed, plants likely created Earth’s life-friendly oxygen- and nitrogen-rich biosphere. In the first part, Morton, chief news and features editor of the leading science journal, Nature, traces scientists’ quest to understand how photosynthesis works at the molecular level. In part two, Morton addresses evidence of how plants may have kick-started the complex life cycle on Earth. The book’s final part considers photosynthesis in relation to global warming, for, he says, the Earth’s plant-based balance of carbon dioxide and oxygen is broken: in burning vast amounts of fossil fuels, we are emitting more carbon dioxide than the plants can absorb. But Morton also explores the possibility that our understanding of photosynthesis might be harnessed to regain that balance.
From the acclaimed author of Proust Was a Neuroscientist, a fascinating look at the new science of decision-making-and how it can help us make better choices. Since Plato, philosophers have described the decisionmaking process as either rational or emotional: we carefully deliberate or we “blink” and go with our gut. But as scientists break open the mind’s black box with the latest tools of neuroscience, they’re discovering that this is not how the mind works.Our best decisions are a finely tuned blend of both feeling and reason — and the precise mix depends on the situation.When buying a house, for example, it’s best to let our unconscious mull over the many variables. But when we’re picking a stock, intuition often leads us astray.The trick is to determine when to lean on which part of the brain, and to do this, we need to think harder (and smarter) about how we think.
If the genome of an extinct species can be reconstructed, biologists can work out the exact DNA differences with the genome of its nearest living relative. There are talks on how to modify the DNA in an elephant’s egg so that after each round of changes it would progressively resemble the DNA in a mammoth egg. The final-stage egg could then be brought to term in an elephant mother, and mammoths might once again roam the Siberian steppes.
The article also notes that if this works for the mammoth, it might also be possible to do the same for a Neanderthal. What an age we live in.
It’s true that after 300 years, nuclear waste is still about 100 times more radioactive than the original uranium that was removed from the earth. But even this isn’t as scary as it sounds. If the waste is stored underground in such a way that there’s only a 10 percent chance that 10 percent of it will leak — which should be more than doable — the risk will be no worse than if we had never mined the uranium in the first place.
Muller asserts that safe nuclear power is a solved technical problem and that the use of it is a political issue.
It’s worth sitting through the annoying “in a world…” narration to see the structure of an immense colony of ants. The scientists poured 10 tons of concrete down into an abandoned ant colony, waited for it to harden, and then spent weeks excavating the results.
During the construction of the giant structure, it’s estimated that the ants hauled 40 tons of dirt out of the holes, the equivalent of building the Great Wall of China. (via cyn-c)
The same thing happened: something would look good at first and then turn out to be horrifying. For example, there was a book that started out with four pictures: first there was a windup toy; then there was an automobile; then there was a boy riding a bicycle; then there was something else. And underneath each picture it said, “What makes it go?”
I thought, “I know what it is: They’re going to talk about mechanics, how the springs work inside the toy; about chemistry, how the engine of the automobile works; and biology, about how the muscles work.”
It was the kind of thing my father would have talked about: “What makes it go? Everything goes because the sun is shining.” And then we would have fun discussing it:
“No, the toy goes because the spring is wound up,” I would say. “How did the spring get wound up?” he would ask.
“I wound it up.”
“And how did you get moving?”
“From eating.”
“And food grows only because the sun is shining. So it’s because the sun is shining that all these things are moving.” That would get the concept across that motion is simply the transformation of the sun’s power.
In lean times, men look for women who can work and in times of plenty, they want women who can reproduce.
The Environmental Security Hypothesis says that in tough times men will prefer women who are good at production, generally older, taller, heavier, less curvaceous women with less body fat. In good times, they will prefer women who are good at reproduction, generally younger, shorter, lighter, more curvaceous women.
Consistent with Environmental Security Hypothesis predictions, when social and economic conditions were difficult, older, heavier, taller Playboy Playmates of the Year with larger waists, smaller eyes, larger waist-to-hip ratios, smaller bust-to-waist ratios, and smaller body mass index values were selected. These results suggest that environmental security may influence perceptions and preferences for women with certain body and facial features.
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