Slashdot Mirror

thedreadedwiccan points out a summary of a recently released physics paper about tying knots with light. A pair of researchers showed that a relatively new solution to Maxwell's equations allows light to be twisted into stable loops. They are designing experiments to test the theory now, and it could have a big impact on fusion technology. The paper's abstract is available at Nature, though a subscription is required to see the rest. Quoting: "In special situations, however, the loops might be stable, such as if light travels through plasma instead of through free space. One of the problems that has plagued experimental nuclear fusion reactors is that the plasma at the heart of them moves faster and faster and tends to escape. That motion can be controlled with magnetic fields, but current methods to generate those fields still don't do the job. If Irvine and Bouwmeester's discovery could be used to generate fields that would send the plasma in closed, non-expanding loops and help contain it, 'that would be extremely spectacular,' Bouwmeester says."

palegray.net writes "Nature is reporting on new findings that prions jump species barriers. Believed to be responsible for ailments such as Creutzfeld-Jakob disease and 'mad cow' disease, prions are thought to disrupt biological processes by causing normal proteins to fold abnormally. Researchers at the University of Texas Medical Branch in Galveston have observed infectious prions from hamsters causing abnormal protein development in mice, along with a range of other observations on prion actions in test tube environments. From the article: '... they also found that when a prion jumps species, it produces a new kind of prion. "This is very worrisome," says Claudio Soto, who led the research, published in Cell. "The universe of possible prions could be much larger than we thought."' Sounds like another good reason to donate your spare CPU cycles to projects like Folding@home."

Hugh Pickens writes "John Tierney poses the question in the New York Times 'what if we let athletes do whatever they wanted to excel?' Before you dismiss the notion, consider what we're stuck with today — a system designed to create a level playing field, protect athletes' health and set an example for children, that fails on all counts. The journal Nature, in an editorial in the current issue, complains that 'antidoping authorities have fostered a sporting culture of suspicion, secrecy and fear' by relying on unscientifically calibrated tests, like the unreliable test for synthetic testosterone that cost Floyd Landis his 2006 Tour de France victory and even if the authorities manage to correct their tests, they can't possibly keep up with the accelerating advances in biology." Read on for more. Hugh Pickens continues: "Bengt Kayser, the director of a sports medicine institute at the University of Geneva argues in an article that has been supported by more than 30 scholars in the British Medical Journal that legalizing doping would "encourage more sensible, informed use of drugs in amateur sport, leading to an overall decline in the rate of health problems associated with doping (pdf). In the competition between increasingly sophisticated doping — e.g. gene transfer — and antidoping technology, there will never be a clear winner. Consequently, such a futile but expensive strategy is difficult to defend.""

SpaceAdmiral writes "Scientists have discovered a virus that can infect another virus. The fact that viruses can essentially get sick may change the debate over whether they are alive or not. Check out Nature for a slightly more technical article about the 'virophage.'"

biogeochick writes "Ever turn on the air conditioner on a hot day? How about a heater when it gets cold? OK, so we all know that humans act to keep themselves cool, but what about trees? A recent article on tree core isotopic evidence has shown that trees from tropical to boreal forests all grow at 70 degrees. The study, published in Nature by some fantastic researchers (so one of them is my adviser, so sue me) and covered by NPR on All Things Considered, has shed some light on the convergent temperature at which trees perform photosynthesis." Update: 06/19 21:31 GMT by T : I give, I give -- that's 70 degrees Fahrenheit.

Ponca City, We Love You sends news of a study by Colorado State University psychologist William Szlemko that recorded whether people had added seat covers, bumper stickers, special paint jobs, stereos, or plastic dashboard toys to their cars. Szlemko found a link between road rage and the number of personalized items on or in people's vehicles. "The number of territory markers predicted road rage better than vehicle value, condition, or any of the things that we normally associate with aggressive driving,' says Szlemko. What's more, only the number of bumper stickers, and not their content, predicted road rage... Szlemko suggests that this territoriality may encourage road rage because drivers are simultaneously in a private space (their car) and a public one (the road). 'We think they are forgetting that the public road is not theirs, and are exhibiting territorial behavior that normally would only be acceptable in personal space,' the researcher says.

SpaceAdmiral writes "The once-popular idea that the universe could be small and finite is making a comeback. Many researchers thought that a 'wraparound' universe would mean that distant objects would be seen multiple times in the sky, but new research suggests that a '3-torus' (or 'doughnut universe'), as well as other shapes, could fit our actual observations, particularly the WMAP data."

Pioneer Woman writes "Researchers at Hebrew University in Jerusalem have found a link between a gene called AVPR1a and ruthless behavior. These findings come from an economic exercise called the 'Dictator Game' that allows players to behave selflessly, or like national dictators and 'little Hitlers' found in workplaces the world over. The team decided to look at AVPR1a because it is known to produce receptors in the brain that detect vasopressin, a hormone involved in 'prosocial' behavior. Researchers tested DNA samples from more than 200 student volunteers, before asking the students to play the game that measured their altruism. There was no connection between the participants' gender and their behavior but there was a link to the length of the AVPR1a gene."

Nature is reporting that a new distributed computing application is looking to monitor earthquake data using the accelerometer in many computing devices. In the long run, "Quake-Catcher" will hopefully be fast enough to give warning before major earthquakes. "If it works, it will be the cheapest seismic network on the planet and could operate in any country. It wouldn't be as sensitive as traditional networks of seismometers, but Lawrence says that's not the point. 'If you have only two sensors in an area, you have to have a perfect system. If you have 15 sensors in a system it [can] be less perfect. One hundred, one thousand, ten thousand -- your need for the system to be perfect becomes much smaller,' he says. 'That's really our approach -- just to have massive numbers.'"

electrostatic writes "In a Nature.com oldie-but-goodie, a physicist says he has solved a problem that costs airlines millions every year: what is the quickest way to get passengers aboard an aircraft? Boarding is a serious issue for airlines, particularly those operating short flights that run several times a day, yet boarding times have steadily increased for decades. Back in 2005 Jason Steffen of the Fermilab in Batavia, Illinois said the method used by many airlines to this day is almost the worst. 'The best way to board, according to the researchers, would be a row-by-row, seat-by-seat, strict order. That would mean everyone lines up, row 25 first. I can't imagine fliers will go for that. Next best, they say, would be boarding all the window seats first, followed by those in the aisle. Obviously that's not practical, at least for couples or families traveling together.'"

its hard to think of writes "There's an interesting story up at Nature News about scientific ethics. It seems that while one group of scientists is figuring out details about aetosaurs (ancient crocodiles), another group in New Mexico is repeatedly taking credit for their work and naming the new animals they 'discover'. It also looks like the state government, which has been asked to intervene, is trying to sidestep the issue. 'The New Mexico cultural-affairs department, which oversees the museum, conducted a review of two of the instances last October and concluded that the allegations were groundless. But some experts call that review a whitewash, claiming that it failed to follow accepted practices of US academic institutions faced with claims of misconduct. Now all three cases are before the Ethics Education Committee of the Society of Vertebrate Paleontology, a professional organization based in Northbrook, Illinois, which is awaiting responses from the New Mexico team before making a ruling.' How widespread is this kind of thing?"

Reservoir Hill writes "Epidemiological studies in humans have suggested a link between air pollution and reduced male fertility, but such studies are often confounded by other lifestyle differences such as diet, genetic background, and economic class. Now a study of mice, reared in cages kept in a shed downwind of two steel mills and a busy highway in a Canadian city, showed a host of genetic changes compared to similarly housed mice breathing filtered air. DNA in the sperm of the mice in the polluted area contained 60% more mutations, had more strand breaks, and had more bases that had been chemically modified via the addition of a methyl group. Precisely how the pollution caused the DNA damage remains unclear but changes may be a more general response to particulate pollution. 'It's important to move this forward to the next step: determining whether there are any human corollaries to this,' says Jonathan Samet, an epidemiologist at Johns Hopkins University."

mlimber writes "Nature magazine's news section has an interesting story about how the seats in the US House of Representatives should be divided up. The problem is that the population isn't evenly divided by the number of seats in the House (435). So how should one allocate the fractional parts? The current method tends to favor big states, while a recent proposal by a mathematician is for what he calls a 'minimally unfair' allotment. He is predicting 'one person, one vote' challenges on this topic in the near future."

Darum writes "Researchers are working to create devices built on the rules of quantum mechanics. These would allow quantum computers which can do certain problems such as prime number factorization for decryption and simulation of complex systems (such as protein folding) in a tiny fraction of the time required on classical computers. Two papers appearing in this week's Nature raise the possibility of developing such quantum devices by manipulating light signals by semiconductor quantum dots. One of the approaches bases on photonic crystals, which seem pretty ideal for on-chip integration of a full set of computation components. One of the study's authors put up a good background story of this work on CVitae. The author discusses the potential simplicity and microchip scalability of these two quantum-dot 'light switch' systems. This could be good news for quantum information processing and ultra-secure long-distance communication applications. It could also allow all-optical signal processing, which has long been a holy grail for optical communications and could allow extremely fast and low-power optical interconnects."

palegray.net writes "A December 6th article in Nature explores the relationship between a specific gene and those of us prone to repeatedly making the same mistakes. From the article: "Drug addicts, alcoholics and compulsive gamblers are known to be more likely than other people to have this genetic mutation ..." The gene results in the development of fewer D2 receptors in the brain, a condition which the study has shown leads to a lessened ability to learn from experience." So no complaining about dupes and typos: it's genetic!

PCOL writes "Salar de Uyuni is a vast plain of white salt in the mountains of Bolivia, with a total elevation range of less than 80 centimeters - the flattest place on earth. Beginning in 2002, geophysicist Adrian Borsa led a survey that resulted in precise GPS measurements of the salt flat. The flats will be used as a giant calibration device for satellite-based radar and laser altimeters on the CryoSat recovery mission so the spacecraft can more precisely monitor changes in the elevation and thickness of polar ice sheets and floating sea ice. 'Satellites can calibrate their altimeters by bouncing signals off the ocean surface .. because of atmospheric interference, tides and waves, there are uncertainties. Borsa says the salar, now so accurately mapped and with dry, clear skies, is about five times better than the ocean as a reference point.'"

Reservoir Hill writes "Zombie insects might sound like a B-movie plot device (quicktime video) but to the emerald cockroach wasp (Ampulex compressa), they're a tried and tested way to provide food for their hungry larvae. The wasp relies on cockroaches for its grisly life cycle but unlike many venomous predators, which paralyze their victims before eating them, the wasp's sting leaves the cockroach able to walk, but unable to initiate its own movement. Researchers have discovered that the wasps sting the cockroaches once to subdue them, then administer another, more precise sting right into their victim's brain. The venom works to block a neurotransmitter called octopamine with a similar action to dopamine, which is involved in preparations to execute complex behaviors such as walking. Then the wasp grabs the cockroach's antenna and leads it back to the nest 'like a dog on a leash', says one researcher. The team found that they could restore spontaneous walking behavior in stung cockroaches by giving them a compound that reactivates octopamine receptors in the insects' central nervous system. Researchers were also able to create their own zombies by injecting unstung cockroaches with a compound that blocks the receptors producing a similar effect to that of the venom."

Ponca City, We Love You writes "Congress is expected to vote this week on a bill requiring investigators funded by the National Institutes of Health (NIH) to publish research papers only in journals that are made freely available within one year of publication. Until now, repeated efforts to legislate such a mandate have failed under pressure from the well-heeled journal publishing industry and some nonprofit scientific societies whose educational activities are supported by the profits from journals that they publish. Scientists assert that open access will speed innovation by making it easier for them to share and build on each other's findings. The measure is contained in a spending bill that boosts the biomedical agency's effective budget by 3.1%, to $29.8 billion in 2008. The open-access requirement in the bill would apply only during fiscal year 2008; it would need to be renewed in yearly spending bills in the future."

Dr. Eggman writes "Ars Technica reports on a new study that suggests not only that certain areas of the mouse genome undergo more changes, but that changes to those areas are more tolerable by the organism than changes in other areas. Recently published in Nature Genetics, the study examined the certain copy number variations of the C57Bl/6 strain in mice that have been diverging for less than 1,000 generations. The results were a surprising number of variations. While the study does not address it, Ars Technica goes on to recount suggestions that genomes evolved to the point where they work well with evolution."

Hugh Pickens writes "According to recent research, huge amounts of sulphur dioxide released by volcanic eruptions may have had more to do with wiping out dinosaurs than the meteorite strike at Chicxulub on Mexico's Yucatán Peninsula. Marine sediments drilled from the Chicxulub crater have revealed that that the mass extinctions occurred 300,000 years after Chicxulub hit Earth. The Deccan volcanism was a long cumulative process that released vast amounts of greenhouse gases into the atmosphere. '"On land it must have been 7-8 degrees warmer," says Princeton University paleontologist Gerta Keller. "The Chicxulub impact alone could not have caused the mass extinction, because this impact predates the mass extinction."' Keller also postulates a second larger and still unidentified meteor strike after Chicxulub, that left the famous extraterrestrial layer of iridium found in rocks worldwide and pushed earth's ecosystem over the brink. But where's the crater? "I wish I knew," says Keller."

cats-paw writes in with news of research that seems to confirm and support current theories of how cosmic rays are created. The prevailing thinking has been that cosmic rays are generated in the regions where supernovas' shock waves interact with the interstellar medium. The new research used the variability in X-ray emissions from a supernova remnant to estimate the strength of the magnetic fields present in that environment. The results lend support to the possibility of protons and nucleii being accelerated in supernova remnants to energies of 1 PeV (10^15 eV) and beyond. Here is the abstract from Nature.

Hugh Pickens writes "The University of Saskatchewan's has the first place climb in the Second Annual Space Elevator Games being held this weekend at the Davis County Event Center in Salt Lake City. Teams are competing for $1,000,000 in NASA prize money. Although the idea of a space elevator has been around for decades, the space technologies needed to support it have yet to be created. The non-profit Spaceward Foundation has hosted an annual competition since 2005 to build a super-strong tether, or get a robot to climb a suspended ribbon. In the robot climber competition, teams have to get their device to hurtle up a 100-metre-long ribbon, suspended from a crane, at an average speed of two metres per second. The climber must be powered from the ground: strategies include reflecting sunlight from huge mirrors on the ground to solar panels on the climber; shining lasers from the ground up to similar panels on the robot; or firing microwaves up at the climber. Qualifying rounds have been taking place all week, and although high winds and rain have caused delays, four out of eight teams have made it into the finals. There are no outdoor climbs today because of bad weather but some of the tether competitions will happen indoors later this afternoon."

Hugh Pickens writes "After the Genesis mission spent 27 months in space gathering tiny samples from different types of solar wind, Hollywood stunt pilots swooped in with a helicopter to catch the falling capsule when it returned to earth. Unfortunately the spacecraft's parachute did not open, and the spacecraft ploughed a hole into the desert. Now scientists are starting to recover data from the salvageable pieces of Genesis. Nature Magazine reports that an analysis of isotopes of neon and argon shows that the elements of main interest to the researchers have the same isotopic signature in the solar wind as in the Sun itself. Because dirt contains relatively little neon and argon, the current Science study wasn't affected too much by contamination and the the team remains hopeful that they will be able to get results on oxygen and nitrogen isotopes from the mission."

aisaac writes "Earlier this year an article in Nature (PDF, subscription required) exposed publishers' plans to equate public access to federally funded research with government censorship and the destruction of peer review. In an open letter last month, Rockefeller University Press castigated the publishers' sock-puppet outfit, PRISM, for using distorting rhetoric in a coordinated PR attack on open access. Now the Association of Research Libraries has released an Issue Brief addressing this PR campaign in more detail. The Issue Brief exposes some of the distortions used to persuade key policy makers that recent gains made by open access scientific publishing pose a danger to peer reviewed scientific research, free markets, and possibly the future of western civilization. As an example of what the publishers backing PRISM hate, consider the wonderfully successful grants policy of the National Institutes of Health, which requires papers based on grant-funded research to be published in PubMed Central."

i_like_spam writes "Recent commentary at Nature Climate Change describes an on-going debate about the energy savings associated with the background colors used by high-traffic websites such as Google and the NYTimes. A back of the envelope calculation has suggested energy savings of 750 Megawatt hours per year if Google switched their background from white to black. In response, a new version of Google called Blackle was created. However, other calculations by the Wall Street Journal suggest minimal energy savings."

tgeller writes "My story on the Nature site announced that a team of computer scientists at the University of Alberta has solved checkers. From the game's 500 billion billion positions (5 * 10^20), 'Chinook' has determined which 100,000 billion (10^14) are needed for their proof, and run through all relevant decision trees. They've set up a site where you can see the proof, traverse the logic, and play their unbeatable automaton. '[Jonathan] Schaeffer notes that his research has implications beyond the checkers board. The same algorithms his team writes to solve games could be helpful in searching other databases, such as vast lists of biological information because, as he says, "At the core, they both reduce to the same fundamental problem: large, compressed data sets that have to be accessed quickly."'"

Invisible Pink Unicorn writes "Researchers at the University of Cambridge have combined studies of global human genetic variations with skull measurements worldwide to show conclusively the validity of the single origin hypothesis. The alternative hypothesis contended that different populations independently evolved from Homo erectus to Home sapiens in different areas. The lead researcher explains, 'The origin of anatomically modern humans has been the focus of much heated debate. Our genetic research shows the further modern humans have migrated from Africa, the more genetic diversity has been lost within a population. However, some have used skull data to argue that modern humans originated in multiple spots around the world. We have combined our genetic data with new measurements of a large sample of skulls to show definitively that modern humans originated from a single area in Sub-saharan Africa.' The article abstract is available from Nature."

BigLug writes with news that two experts in non-linear dynamics, Gert van der Heijden and Eugene Starostin of University College London, have developed an algebraic equation that describes the Möbius strip — something that, you may be surprised to learn, had never been done since the form's discovery in 1858. ABC.net.au has an accessible short summary: "What determines the strip's shape is its differing areas of 'energy density,' they say. 'Energy density' means the stored, elastic energy that is contained in the strip as a result of the folding. Places where the strip is most bent have the highest energy density; conversely, places that are flat and unstressed by a fold have the least energy density."

chinmay7 writes "There is an excellent selection of articles (and quite a few related scientific papers) in a special edition of Nature magazine on interpretations of the multiverse theory. 'Fifty years ago this month Hugh Everett III published his paper proposing a "relative-state formulation of quantum mechanics" — the idea subsequently described as the 'many worlds' or 'multiverse' interpretation. Its impact on science and culture continues. In celebration, a science fiction special edition of Nature on 5 July 2007 explores the symbiosis of science and sf, as exemplified by Everett's hypothesis, its birth, evolution, champions and opponents, in biology, physics, literature and beyond.'

palewook writes "A recent breakthrough increased NASA's interest in a lunar-based space telescope. Researchers combined an ionic liquid surface and a layer of silver which produced a favorably reflective mirror."

Tim O'Reilly has a post about how the prominent scholarly journal Nature has recently launched an open-access service for pre-publication research and presentations. In Nature Precedings, all content is released under a Creative Commons Attribution License, and can be commented and voted on. The service will cover research in biology, chemistry, and earth science, much like arXiv.org does for physics, mathematics, and computer science.

bshell writes "An article in science blog says we may have to rethink how genes work. So called "junk DNA" actually appears to be functional. What's more it works in a mysterious way involving multiple overlaps that seems to be connected in some sort of network." From the article: "The ENCODE consortium's major findings include the discovery that the majority of DNA in the human genome is transcribed into functional molecules, called RNA, and that these transcripts extensively overlap one another. This broad pattern of transcription challenges the long-standing view that the human genome consists of a relatively small set of discrete genes, along with a vast amount of so-called junk DNA that is not biologically active. The new data indicates the genome contains very little unused sequences and, in fact, is a complex, interwoven network. In this network, genes are just one of many types of DNA sequences that have a functional impact. "Our perspective of transcription and genes may have to evolve," the researchers state in their Nature paper, noting the network model of the genome "poses some interesting mechanistic questions" that have yet to be answered."

anik315 writes "Nature is reporting a major breakthrough in embryonic stem cell research. A straightforward procedure using mouse fibroblasts harvested from the skin can be used to produce pluripotent stem cells that can potentially become any other cell in the body. Not only can Yamanaka's method use the most basic cells, it can be accomplished with simple lab techniques. Possible applications of this breakthrough are to check molecular changes in cells as certain conditions develop. Stem cells produced using this procedure, however, can not be used safely to make genetically matched cells for transplant."

Vicissidude writes with a link to a story on the Nature website, discussing the discovery of a protein that may enable us to sense cold temperatures. It's been pinned down in mice, and the same protein may perform a similar function in humans. Mice rely on a single protein, called TRPM8, to sense both cold temperatures and menthol, the compound that gives mints their cool sensation. The sensor also controls the pain-relieving effect of cool temperatures, but does not seem to play an important role in the response to painfully cold temperatures below 10 C. TRPM8 is in the same family as the protein that detects heat and capsaicin, the compound that makes peppers hot. These proteins lie in the cell membranes of select neurons, and form channels that open and close in response to external signals."

Roland Piquepaille writes "Several companies have started to sell power 'pads' that can charge your cellphone when you put it on the pad's surface. But these silicon-based pads are expensive — and relatively 'specialized.' Now, Japanese researchers have built a plastic sheet which could power all the devices placed close to it. So far, this 4-layer sheet, which uses printed organic transistors and plastic MEMS switches, can deliver up to 40 watts of power — enough for some laptops. The technology is apparently efficient and inexpensive to produce. But as the devices to recharge will need to incorporate a special receiver, don't expect to see these plastic power sheets on sale before several years."

permaculture sends us to nature.com for a description of new (and old) research that might possibly shed some light on the origin of the hexagon around Saturn's north pole. Researchers at the Technical University of Denmark have spun buckets of water, in much the same way Isaac Newton did, and photographed geometrical whirlpools developing. As the buckets are spun up, central holes develop that are first elliptical, then triangular, then square, pentagonal, and hexagonal. A UT Austin researcher is quoted as saying it's unlikely this process is behind the Saturn mystery.

aeoneal sends us to PhysicsWeb for news guaranteed to induce headache in those wedded to the reality of, well, reality. Researchers from the University of Vienna have shown the violation of a stronger form of Bell's inequality known as Leggett's inequality. The result means that we must not only give up Einstein's hope of "no spooky action at a distance," we must also give up (some of) the idea that the world exists when we are not looking. From the article: "[Studies] have ruled out all hidden-variables theories based on joint assumptions of realism, meaning that reality exists when we are not observing it; and locality, meaning that separated events cannot influence one another instantaneously. But a violation of Bell's inequality does not tell specifically which assumption — realism, locality, or both — is discordant with quantum mechanics." From the Nature abstract: "Our result suggests that giving up the concept of locality is not sufficient to be consistent with quantum experiments, unless certain intuitive features of realism are abandoned." Only subscribers to Nature, alas, can know what features those are, as PhysicsWeb doesn't tell us.

holy_calamity writes "A first step to allowing wireless data transfer over a currently unused part of the electromagnetic spectrum is reported in New Scientist. Terahertz radiation exists between radio and infrared. A new filter created at the University of Utah can filter out particular frequencies, a prerequisite for using it for data. The abstract of the paper in the journal Nature is freely available."

daftna writes in with a story from Nature about a pair of twins who are neither identical nor fraternal: they are semi-identical. Researchers discovered twins who share all of their mother's DNA but only half of their father's. Both children are chimeras — their cells are not genetically uniform, but include a mix of genes from two separate sperm cells that fertilized a single egg. This is, apparently, not as rare as one might think; but the resulting fetus is rarely viable. This report marks the first known incidence of two half-identical twins resulting from a double fertilization.

finisterre writes "Diodes can be made to 'swim' through salt water by hitting them with an alternating electric field. The applied field induces a current that sets up a field between the diode's electrical contacts and creates a propulsive force. The abstract of the paper in Nature Materials is freely available. New Scientist has videos of the swimming diodes in action."

rednuhter writes "Nature online is reporting scientists have used drugs to selectively remove one memory while not affecting another. Musical tones were played to the rats and at the same time the subjects were given a mild electric shock. Half the study group were given the drug (not approved for use in humans) and then the experiment was repeated with a new tone. The following day the rats that had not been given the treatment were afraid of both tones while the treated half were only afraid of the second tone: the memory of fear of the first had been erased."

An anonymous reader writes "UK researchers are announcing the first ever workable transistor made of graphene — that's one layer of carbon atoms. It's thinner and smaller than a silicon transistor can ever be, and it works at room temperature. When silicon electronics are dead, this is what many speculate is going to take over. There's slight controversy as they decided to announce their results via a review article, rather than wait for their (submitted) peer review paper to come out."

Mr_Foo writes "According to a Nature article, the Mars Reconnaissance Orbiter's HiRISE imager is suffering from a loss of peripheral vision. The problem surfaced less than a month after the orbiter reached Mars. One the camera's four color detectors has completely stopped working, and it is feared that the problems are spreading. Currently seven of the fourteen HiRISE's detectors are sending back corrupted data and although the issue is only creating a 2% loss of signal at this time it is expected to worsen. The lead investigator for the mission is quoted as saying the problem is systemic: 'In the broken detectors, extra peaks and troughs are somehow being introduced, causing... a "ringing" in the signal. "We don't know where the ringing is coming from," [the investigator] says.' Warming the electronics before taking images seems to help the problem. This effect might be one reason why the detectors on the cold periphery of the array were the first to pack up."

Roland Piquepaille writes "According to Nature, a European-funded project has been launched to store electricity created from wind in refrigerated warehouses used to store food. As the production of wind energy is variable every day, it cannot easily be accommodated on the electrical grid. So the 'Night Wind' project wants to store wind energy produced at night in refrigerated warehouses and to release this energy during daytime peak hours. The first tests will be done in the Netherlands this year. And as the cold stores exist already, practically no extra cost should be incurred to store as much as 50,000 megawatt-hours of energy. Here are additional details and a picture illustrating this brilliant idea."

Frequent Slashdot Contributor Bennett Haselton writes "I'm a Wikipedia junkie. There's nothing more fun than switching back and forth between reading about the history of human evolution, and following the latest speculation about the identity of the mysterious R.A.B. in the Harry Potter books, and Wikipedia is the best site to find it all in one place. But as a fan, it's always been frustrating for me knowing that Wikipedia could never improve beyond a certain point -- as it becomes more popular, it becomes more tempting to vandalize, and in turn becomes less reliable, a point that many have made already. That's why I'm excited that sites like Citizendium are approaching the same problem with a different model, one that could enable them to become what Wikipedia almost was, but which its intrinsic nature kept it from being: a central, reliable source of freely redistributable information about almost anything. The main difference is that Citizendium articles, after initially being built up through the same collaborative process that Wikipedia uses, will go into an editor-approved stage, at which point an editor (publicly identifiable on the article's history page) signs off on the accuracy of the article, and further edits also have to be approved by an editor."

Editor control over articles is controversial within the "radical collaboration" community; the Wikimedia foundation lists five "foundation issues that are essentially beyond debate", which includes "Ability of anyone to edit articles without registering". (In practice there are some safeguards in place to protect articles that are frequent targets of vandalism, like the George W. Bush entry.) But I'm fanatically results-oriented in my thinking, and I always ask: What are the purposes of this project, and how does this feature help achieve those purposes? It seems to me that a free online encyclopedia fills four main needs:

1. A source of information about pop culture that can be fun to read even without being 100% sure that it's accurate (like who R.A.B. is)
2. A source of information that can be freely and legally redistributed, e.g. by printing out copies for a class to read
3. A source of information on subjects where you need to be close to 100% certain that the information is reliable -- at least as certain, say, as you would be if you read the same fact in several books
4. A source of information that you can cite in a school paper as being reasonably authoritative and reliable

Anonymous authorship and real-time edits don't affect #1 or #2, and they actually hinder #3 and #4. Citizendium founder (and former Wikipedia board member) Larry Sanger said in a comment for this article, "There is no reason that [projects like Citizendium] even need be collaborative. What we're mainly interested in is reliable, independent/neutral, and free information." Such a statement -- "no reason that they even need to be collaborative" -- may be regarded by some Wikipedia devotees as heresy, but I think it hits the nail on the head. The purpose of such a project is defined by the quality of the information it produces. Collaboration is a possible means to that end, but collaboration itself is not the point.

For the reliability problem, I can't improve on this priceless sentence from Wikipedia's own "Citing Wikipedia" page:

For many purposes, but particularly in academia, Wikipedia may not be considered an acceptable source. ^{[ citation needed ]}

Wikipedia has actually done much better than I would have expected -- a study done in 2005 found that Wikipedia averaged about 4 errors per article compared to Britannica's 3, which is pretty good for a site where anybody can write that Columbus sailed to the New World in ships named the Ninja, the Pinto, and the Santa Fe. But for a site that harnesses the efforts of volunteers all over the world, I think the goal should be to surpass what has been done before, not just to tie with Britannica. And even if Wikipedia's error rate someday beats Britannica's, under its current model Wikipedia can never have the key property that Britannica has, which is that you can cite it as an authoritative source without sounding silly.

Citizendium's model of editor-approved articles, and editor approval of further edits to those articles, can help to achieve the benefits of collaboration, harnessing the efforts of volunteers, without falling into Wikipedia's traps. Assuming you can verify an editor's credentials (and we'll get to this in a minute), having an editor manage an article means two things: (a) you know the page wasn't vandalized in the last five minutes, and (b) you ought to be able to cite the work as a reference in a paper if your teacher isn't a total Luddite and you can explain to them how Citizendium works. Meanwhile, volunteers can still contribute without their own credentials being checked out; they can write as much as they want for an editor-approved article, as long as it's approved by the editor before going live.

There are still loopholes, of course. Currently Citizendium asks people to edit under their real name, but says that "we will use the honor principle to begin with", so anyone could claim to be a professor or a lunar astronaut. But the key words are "to begin with"; the difference between Wikipedia and Citizendium is that Citizendium views this as a loophole and not an intrinsic "community value", and loopholes can be fixed. To make the reliability as airtight as possible, I hope that Citizendium will eventually implement some sort of verification system, such as checking a professor's contact information on a Web page in the "faculty" section of an .edu Web server. I'm not instinctively thrilled by the thought of checking out volunteers' contact information, but it seems like the only way to achieve goals #3 and #4 above, so if it's as simple as sending a verification e-mail to an .edu address, that's a lot of gain for little effort. (Remember, this only has to be done for editors who sign off on articles, not for all volunteers. A non-editor volunteer could still ask to have their credentials checked out, so that they can be cited by their real name in the "end credits" of an article that lists volunteer contributors. But impersonation among regular volunteers is not likely to be a problem, since the editorial approval process ensures that only value-adding edits will be allowed, and it's unlikely that Alice would pretend to be Bob so that Bob can take all the glory of Alice's contributions to the project!)

Besides verifying authors' credentials, the one change that I hope Citizendium considers in the future is to give authors and editors credit at the top of each article -- or, for articles with many contributors, perhaps editors would be listed at the top and the "end credits" would list all contributors, on a separate page if necessary. This is because credited authorship for an article can help improve the article's usefulness in two ways -- the article can be cited as a reliable source, and the "name up in lights" factor rewards people for contributing more and better articles. Having authors listed only on the history page of an article, as they are in the current model, achieves the credibility benefit but not the "name up in lights" benefit. Larry Sanger suggested that having authors listed at the top of each article might put off readers from submitting edits -- if an article is perceived as being "owned", then others might feel like it's rude for them to change it. For me personally, this could go either way -- on the one hand, I might not realize that I was welcome to edit an article, but on the other hand, I think I might be more inclined to submit edits if I knew there was an editor in charge to keep someone else from frivolously overwriting my edits later. But in any case, to address this problem, each article could carry a banner at the top saying "Readers are encouraged to submit edits and other suggestions", and each paragraph could be accompanied by an "Edit" link, similar to Wikipedia (except that edits would go into a queue to be reviewed by the editor instead of going live). This would address the ownership-intimidation problem without taking away from the "name up in lights" factor. Sanger says that the Digital Universe Encyclopedia -- comprising the Encyclopedia of Earth and an Encyclopedia of the Cosmos, under development -- has plans to join with Citizendium and will use the credited-author model on their version of the site.

You might say that editors having their "name up in lights" would be an ego thing for editors, and I think you'd be right -- but I don't think this would be a bad thing, inasmuch as ego would motivate more people to become editors and do their best work. Perhaps I'd be wrong about this. Maybe a limited experiment could be carried out with two sites that are similar in every respect except that one allows editors and authors to take credit for their work, as might turn out to be the case with Citizendium and Encyclopedia of Earth. The point is that I don't think such a suggestion should be judged by whether it goes against the "spirit" of the project (as it certainly does in the case of Wikipedia!), but rather whether it helps to achieve the projects goals, such as goals #1 through #4 listed above.

There are still some problems that Citizendium's differences from Wikipedia won't solve. Many schools discourage citing Wikipedia not because it's written anonymously or because it contains errors, but because it's an encyclopedia. Yale's guidelines for citing Wikipedia state:

As an encyclopedia, Wikipedia is written for a common readership. But students in Yale courses are already consulting primary materials and learning from experts in the discipline. In this context, to rely on Wikipedia -- even when the material is accurate -- is to position your work as inexpert and immature.

Presumably many academics would have the same objections to a student citing Citizendium. I understand what these teachers mean, but I think this is a case of not thinking in terms of results. If the purpose of an assignment is to collect and present information, then any means of accomplishing that goal should be valid, including the easiest method of looking up the information in an encyclopedia. To make a student look beyond the encyclopedia, an assignment can simply require depth of research that goes beyond what the encyclopedia would provide. (Students, if you're worried that your teacher will take this to heart and make your assignments harder, just be happy that your teacher is hip enough to be reading this in the first place.) Some things are hard, but they should only be hard if they're intrinsically hard, not because you handicapped yourself with arbitrary rules.

But there is another, more permanent problem -- even with verification of authors' credentials, how do we know that the information in Citizendium articles is accurate? How do we know the author didn't make a mistake, or lie? This gets into deeper issues because these problems exist no matter what source you're consulting. There are books in print that deny the Holocaust or the possibility of evolution, and they're printed on real paper, with ISBN numbers and everything. Some of them even make it into libraries. How skeptical should we be of we read in books? In January two advocacy groups presented a report to Congress in which many government scientists said they felt pressured by the Bush administration to downplay the global warming threat in their statements. Does that mean statements from government scientists are inherently suspect?

And almost anyone who has had more than two articles written about them, knows the feeling of reading the article and reacting, "Wow, I had no idea that I was a transgendered NRA member who volunteers with the Moonies!" The New York Times is hosting an article about me from 2000 claiming that I was fired from Microsoft, when I actually quit. I showed them a copy of my personnel file with "Voluntary resignation" printed on it, but they have still refused to change the article. (When I first wrote to the paper's "Public Editor" about the matter, created to restore "reader credibility" after the Jayson Blair scandal, they replied that they wouldn't change the error because it never appeared in the print version of the paper. Huh?) I put up my own webpage to tell my side of the story, but if you were a Wikipedia or Citizendium editor and you had conflicting information from different sources, who would you believe, the New York Times, or a Web site called PublicEditorMyAss.com?

And yet, I freely admit that even today, I would trust a fact from the New York Times more than a fact from Bob's Bait And Tackle Shop And Technology Blog. We instinctively trust sources because of their reputation; we figure that they must have gotten their reputation somehow. This is not a great algorithm for deciding trustworthiness, but it may be the best that we can do -- in a world where we can't verify every fact firsthand, what choice do we have but to rely on sources that have provided mostly-reliable information in the past? (Wikipedia vandals are able to hack this mental algorithm because we think of Wikipedia as "one source" with a high average reliability, when it's really comprised of many sources, some of whom are deliberately less reliable than others.)

So, I think the Citizendium model is a move in the right direction -- taking into account the limits of what we can know from third-party sources, and doing the best we can within those limits. The least we can do is to know who has signed off on the accuracy of an article, so we can factor that into our decision to trust it. Last month Citizendium released their first editor-approved article, a single article about Biology. It may not look like anything revolutionary right now, but the difference between that and the Wikipedia entry is that you can't change the title of the Citizendium article to LARRY SANGER IS A BUTT BRAIN HA HA. You have to go through an editor for that.

An anonymous reader writes "Since May 2006, a mud volcano in Indonesia has spewed out up to 126,000 cubic metres of mud a day, flooding an area of more than 4 square kilometres. This unprecedented natural disaster has become so bad that geophysicists now plan to enact an untested scheme to try and slow the flow: dropping concrete balls into the volcano."

Billosaur writes "Nature.com is reporting that the Association of American Publishers (AAP), which includes the companies that publish scientific journals, is becoming concerned with the free-information movement. A meeting was arranged with PR professional Eric Dezenhall to discuss the problem. Dezenhall's firm has worked with the likes of ExxonMobil 'to criticize the environmental group Greenpeace', among other campaigns. The publishers are worried that the free exchange of scientific information may be bad for the bottom line, as it might cause the money from subscriptions to their journals to dry up. Among the recommendations: 'The consultant advised them to focus on simple messages, such as "Public access equals government censorship". He hinted that the publishers should attempt to equate traditional publishing models with peer review, and "paint a picture of what the world would look like without peer-reviewed articles.' The AAP is trying to counter messages from groups such as the Public Library of Science (PLoS), an open-access publisher and prominent advocate of free access to information, or the National Institutes of Health's (NIH's) PubMed Central."

davidwr writes "A team of researchers at Duke University published a paper linking the brain's posterior superior temporal cortex to altruistic behavior. The BBC also picked up the story. If confirmed this has applications in neurology, psychology, child-rearing, and a host of other domains. From the BBC piece: 'Using brain scans, the US investigators found this region related to a person's real-life unselfish behaviour. The Duke University Medical Center study on 45 volunteers is published in Nature Neuroscience. The participants were asked to disclose how often they engaged in different helping behaviours, such as doing charity work, and were also asked to play a computer game designed to measure altruism.'"

quant-guru writes "Man's domination of light continues. New Scientist is running a story that highlights recent theoretical proposals for a photonic insulator, an engineered material that could make photons solidify. From the article: "OK, it wouldn't be a material in the everyday sense of the word, like a solid you could touch, but it could behave like one in some important ways...photons interacting in a quantum material could give us insights into how real materials with quantum properties work." One proposal by Greetree et al. (Nature Physics) (preprint) imagines a device that will allow many photons to interact with each other simultaneously in diamond, with phases reminiscent of real materials (from superfluid to insulating). This could lead to novel devices based on quantum phenomena, for quantum communication or quantum computers as examples. Similar proposals were made concurrently by two other groups: Angelakis et al. and Hartmann et al. (Nature Physics) (preprint). University of Cambridge physicist Charlie Tahan has more information and links (with step-by-step pictures) on his site."

quant-guru writes "Man's domination of light continues. New Scientist is running a story that highlights recent theoretical proposals for a photonic insulator, an engineered material that could make photons solidify. From the article: "OK, it wouldn't be a material in the everyday sense of the word, like a solid you could touch, but it could behave like one in some important ways...photons interacting in a quantum material could give us insights into how real materials with quantum properties work." One proposal by Greetree et al. (Nature Physics) (preprint) imagines a device that will allow many photons to interact with each other simultaneously in diamond, with phases reminiscent of real materials (from superfluid to insulating). This could lead to novel devices based on quantum phenomena, for quantum communication or quantum computers as examples. Similar proposals were made concurrently by two other groups: Angelakis et al. and Hartmann et al. (Nature Physics) (preprint). University of Cambridge physicist Charlie Tahan has more information and links (with step-by-step pictures) on his site."