An anonymous reader writes "Do you still think your online writing is, basically, anonymous? Think again! Research has it people put much of their personal traits into their writing, and computers may just be able to pick them up. That's at least what a recently announced competition on author identification (Given a document, who wrote it?) and author profiling (Given a document, what are its author's age and gender?) wants to find out. Alas, re-using other people's writing is no solution either; there's also a competition on plagiarism detection (Given a document, is it an original?). Wanna revisit your recent rants?"
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When Chinese probe Chang'e buzzed the asteroid Toutatis, it wasn't the only one watching. NASA's observatory in Goldstone, CA was taking radar images, which have now been assembled into a short (40-second) animation. The craft was recording the encounter, too, as reported by Sky & Telescope, which also gives a good summary of the history behind Chang'e's mission.
SternisheFan writes with an excerpt from Bad Astronomer Phil Plait, writing at Slate: "Before she came back to Earth in a ball of fire surrounding her Russian re-entry capsule, astronaut Sunita Williams took time out of her packing for the trip home to give a nickel tour of the International Space Station. ... I know the video's long, but if you have the time I do suggest watching the whole thing. I have very mixed feelings about the space station; it cost a lot of money, and in my opinion it hasn't lived up to the scientific potential NASA promised when it was being designed. But watching this video reminded me of the good that's come out of it: There is science being done there; we're learning how to design and build hardware for long-term space travel; we're learning just how to live in space (and NASA just announced it will be sending humans into space for an entire year, an unprecedented experiment); and we're finding new ways for nations and individuals to cooperate in space."
An anonymous reader writes "For the first time, researchers have found that a chemical in the brain called glutamate is linked to suicidal behavior. While previous research and drugs have targeted serotonin to fight severe depression, this study shows that more attention should be paid to this chemical."
hackingbear writes "Chinese moon probe Chang'e-2 made a flyby of the near-earth asteroid Toutatis on December 13 at 16:30:09 Beijing Time (08:30:09 GMT), the State Administration of Science, Technology and Industry for National Defense (SASTIND) announced today. The flyby was the first time an unmanned spacecraft launched from Earth has taken such a close viewing of the asteroid, named after a Celtic god, making China the fourth country after the U.S., the EU and Japan to be able to examine an asteroid by spacecraft. Chang'e-2 came as close as 3.2 km from Toutatis, which is about 7 million km away from the Earth, and took pictures of the asteroid at a relative velocity of 10.73 km per second, the SASTIND said in a statement. Chang'e-2, originally designated as the backup of Chang'e-1, left its lunar orbit for an extended mission to the Earth-Sun L2 Lagrangian point on June 9, 2011, after finishing its lunar objectives, and then again began its mission to Toutatis this year. 'The success of the extended missions also embodies that China now possesses spacecraft capable of interplanetary flight,' said Wu Weiren, chief designer of China's lunar probe program."
TaeKwonDood writes with news from CERN about more results in the search for the Higgs Boson, this time from the ATLAS experiment. Researchers report peaks in the data in accordance with what they'd expect from the Higgs. The curiosity is that the peaks are a couple GeV away from each other. "The ATLAS analyses in these channels return the best fit Higgs masses that differ by more than 3 GeV: 123.5 GeV for ZZ and 126.6 GeV for gamma-gamma, which is much more than the estimated resolution of about 1 GeV. The tension between these 2 results is estimated to be 2.7sigma. Apparently, ATLAS used this last month to search for the systematic errors that might be responsible for the discrepancy but, having found nothing, they decided to go public." Scientific American has a more layman-friendly explanation available. As this work undergoes review, physicists hope more eyes and more data will shed some light on this incongruity. Tommaso Dorigo, a particle physicist working at the CMS experiment at CERN, writes, "Another idea is that the gamma-gamma signal contains some unexpected background which somehow shifts the best-fit mass to higher values, also contributing to the anomalously high signal rate. However, this also does not hold much water — if you look at the various mass histograms produced by ATLAS (there is a bunch here) you do not see anything striking as suspicious in the background distributions. Then there is the possibility of a statistical fluctuation. I think this is the most likely explanation." Matt Strassler provides a broader update to the work proceeding on nailing down the Higgs boson.
skade88 writes "Worldwide, people are living longer. Their lives are starting to look more like the lives of Americans: too much food is a problem, death in childhood is becoming less common, and so on. Yet with a population that lives through what would once have killed us, disabilities are starting to become the norm. A research report from the Institute for Health Metrics and Evaluation has a good glimpse into the new emerging world we find ourselves in." The Guardian has a nice visualization of the mortality data (but take note of shifting scales on the Y-axis).
yanom writes "I'm currently a high school student using my TI-84 for mathematics courses. It has all the functionality I need (except CAS), but saying that the hardware is dated is putting it nicely. Waiting 4-5 seconds for a simple function to be graphed on its 96x64 screen just makes me want to hurl it at the wall. Recently, I've begun to notice the absurdity of doing my math homework on a 70's era microchip when I have an i7 machine with Linux within arm's reach. I've begun looking for software packages that could potentially replace the graphing calculator's functionality, including Xcas and Maxima, but both lack what I consider basic calculator functionality — xcas can't create a table of values for a function, and maxima can't use degrees, only radians. So, does anyone know of a good software package to replace my graphing calculator (and maybe provide CAS to boot)?"
ananyo writes "DNA strands can be coaxed to fold up into shapes in a matter of minutes, reveals a study published in Science (abstract). The finding could radically speed up progress in the field of DNA origami. DNA origami involves using short DNA strands to hold a longer, folded strand in place at certain points, like sticky tape. Until now, assembling the shape has involved heating the DNA and allowing it to cool slowly for up to a week. But researchers at the Technical University of Munich in Germany have worked out that for most of the cooling period, nothing happens. But when a crucial temperature is reached, the whole structure forms suddenly. The researchers now aim to design nanostructures with optimal folding temperatures close to 37 C, the temperature at which mammalian cell cultures are grown, so that DNA machines could one day be used in biological settings."
Press2ToContinue writes "According to a NASA news release, 'Twin lunar-orbiting NASA spacecraft that have allowed scientists to learn more about the internal structure and composition of the moon are being prepared for their controlled descent and impact on a mountain near the moon's north pole at about 2:28 p.m. PST (5:28 p.m. EST) Monday, Dec. 17. Ebb and Flow, the Gravity Recovery and Interior Laboratory (GRAIL) mission probes, are being sent purposely into the lunar surface because their low orbit and low fuel levels preclude further scientific operations. The duo's successful prime and extended science missions generated the highest resolution gravity field map of any celestial body. The map will provide a better understanding of how Earth and other rocky planets in the solar system formed and evolved. Both spacecraft will hit the surface at 3,760 mph (1.7 kilometers per second). No imagery of the impact is expected because the region will be in shadow at the time.' That's too bad; observing the impacts could provide valuable feedback. For example, a spectrographic analysis of the impact dust cloud could reveal additional density and compositional element information for the lunar polar surfaces." Emily Lakdawalla at the Planetary Society has more information about the violent end to GRAIL's mission. If the probes were going to hit the surface of the Moon vertically, they would probably leave a crater about 3 or 4 meters in diameter. However, they are actually coming in at a very slight angle: 1.5 degrees from the horizontal, though the mountain itself has a 20-degree slope. Despite the darkness at the impact site, NASA will attempt to monitor the crashes using the Lunar Reconnaissance Orbiter.
illtud writes "It appears that the Metropolitan Police in London have been recording the frequency of the mains supply for the past 7 years. With this, they claim to be able to pick up the hum from any digital recording and tell when the recording was made. From the article: 'Comparing the unique pattern of the frequencies on an audio recording with a database that has been logging these changes for 24 hours a day, 365 days a year provides a digital watermark: a date and time stamp on the recording.'"
New submitter stonetony writes with this excerpt from the BBC: "A team of 12 scientists and engineers has begun work at remote Lake Ellsworth. They are using a high-pressure hose and sterilised water at near boiling point to blast a passage through more than two miles of ice. The aim is to analyse ice waters isolated for up to 500,000 years. The team of 12 scientists and engineers is using sterilised water at near boiling point to blast a passage through the ice to waters isolated for up to half a million years. The process of opening a bore-hole is expected to last five days and will be followed by a rapid sampling operation before the ice refreezes."
ananyo writes "A controversial paper published in Nature argues that enigmatic fossils regarded as ancient sea creatures were actually land-dwelling lichen. If true, that would suggest life on land began 65 million years earlier than researchers now estimate. The nature of fossils from the Ediacaran period, some 635 million–542 million years ago, has been fiercely debated by palaeontologists. But where others envisage Ediacaran sea beds crawling with archaic animals, Gregory Retallack, a geologist at the University of Oregon in Eugene, sees these sites in southern Australia as dry, terrestrial landscapes dotted with lichens. He proposes that rock in the Ediacara Member in South Australia — where palaeontologist Reginald Sprigg first discovered Ediacaran fossils in 1947 — represents ancient soils, and presents new geological data. Among other lines of evidence, Retallack argues that the rock's red colour and weathering pattern indicate that the deposits were formed in terrestrial — not marine — environments (abstract). Others strongly disagree."
An anonymous reader writes "Researchers have found conclusive evidence for the first time that humans have been making cheese since the 6th millennium BC."
AbsoluteXyro writes "NASA's Cassini orbiter, which has been dutifully exploring the Saturn system since 2004, has captured images of the first river ever observed on another world — and it's a biggun. 200 miles of flowing hydrocarbons meandering down a valley in the north polar region of Saturn's moon Titan, emptying into the awesomely named Kraken Mare — itself a body of liquid roughly the size of the Mediterranean Sea back on Earth. But don't think of going for an extraterrestrial skinny dip quite yet, temperatures on Titan average a brutally cold 290 degrees below zero (Fahrenheit)."