Science & TechnologyS

Blackbox

Upside-Down Answer for Deep Mystery: What Caused Earth to Hold Its Last Breath?

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© iStockphotoVolcano eruption (Reunion island, Indian Ocean).
When Earth was young, it exhaled the atmosphere. During a period of intense volcanic activity, lava carried light elements from the planet's molten interior and released them into the sky. However, some light elements got trapped inside the planet. In the journal Nature, a Rice University-based team of scientists is offering a new answer to a longstanding mystery: What caused Earth to hold its last breath?

For some time, scientists have known that a large cache of light elements like helium and argon still reside inside the planet. This has perplexed scientists because such elements tend to escape into the atmosphere during volcanism. However, because these elements are depleted in the Earth's upper mantle, Earth scientists are fairly certain the retained elements lie in a deeper portion of the mantle. Researchers have struggled to explain why some gases would be retained while others would rise and escape into the air. The dominant view has been that the lowermost mantle has been largely isolated from the upper mantle and therefore retains its primordial composition.

Magnify

The dark side of geolocation: PleaseRobMe.com

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More than a social statement than an actual utility for aspiring Colton Harris-Moore* copycats, a new site called Please Rob Me has popped up to expose the potential pratfalls of the geolocation craze: If you're pushing a "check-in" from Gowalla, Brightkite, or Foursquare to a local restaurant out to your public Twitter stream, you're broadcasting that you aren't home. Which could be taken to mean that your home is ripe for burglary.

Please Rob Me consists exclusively of an aggregation of public Twitter messages that have been pushed through fast-growing location-based networking site Foursquare, one of a handful of services that encourages people to share their whereabouts with their friends. You can filter by geographic location, too.

"On one end we're leaving lights on when we're going on a holiday, and on the other we're telling everybody on the internet we're not home," the Please Rob Me site says to explain its rationale. "The goal of this website is to raise some awareness on this issue and have people think about how they use services like Foursquare, Brightkite, Google Buzz, etc."

Chess

Microsoft steps up search assault on Google

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© Reuters/Joshua Lott
Microsoft Corp's assault on search engine leader Google Inc took a major step forward on Thursday as U.S. and European regulators cleared the software company's search partnership with Yahoo Inc.

The 10-year deal, struck last July, is the biggest effort yet by Microsoft to establish an online business to rival Google, an area where Microsoft has lost $5 billion over the last four years.

"Microsoft really has room to throw money at this," said Kim Caughey, senior analyst at Fort Pitt Capital Group. "I think it can work. If they can make inroads in specific target areas, they could have something positive to report."

Microsoft has already made some progress with its search engine, Bing, picking up 3.3 points of market share since its launch last June. But Bing is not likely to "push Google off a very big pedestal any time soon," said Caughey.

Magnify

Neuroscientists Reveal New Links That Regulate Brain Electrical Activity

Investigators in the Hotchkiss Brain Institute, Faculty of Medicine, have made a major breakthrough in our understanding of nerve impulse generation within the brain. Brain cells communicate with each other by firing electrical impulses, which in turn rely upon special ion channels that are positioned at strategic locations in their membranes.

This new foundational research is published in the journal Nature Neuroscience.

Principal Investigators, Ray W. Turner, Ph.D. and Gerald Zamponi, Ph.D. study the inhibitory and excitatory actions of ion channels in neurons of the cerebellum. Partnerships between the two laboratories, enabled Turner to 'follow his hunch' to prove that specific members of two different families of channels, previously thought to function independently, in fact function in tandem.

Frog

Chickens can see more colours than humans: Scientist

rooster
© Peter Parks, AFP/Getty ImagesResearchers at the Washington University School of Medicine in St. Louis have discovered light receptors in a chicken's eye allow the bird to see more colours than humans.

After staring into the eyes of chickens, a group of American researchers think they maybe on the path toward finding new ways to treat human blindness.

Researchers at the Washington University School of Medicine in St. Louis have discovered light receptors in a chicken's eye allow the bird to see more colours than humans. The findings, published February in the scientific journal PLoS One, found receptor cells in a chicken's retina are laid out in mosaic-like patterns, organized in a way that gives chickens, and other birds, more sensitive vision than most other mammals.

"I think birds really do see colour in a way different from humans," said Joseph Corbo, senior author of the study and assistant professor of pathology, immunology and genetics.

"That's hard for us to imagine. We don't really know what's in the mind of a chicken," he said.

Vision comes from light-sensitive receptor cells in the retina - a light-sensitive structure at the back of the eye.

The human retina can detect red, blue and green wavelengths, said Corbo.

Blackbox

The writing on the cave wall

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© Dozier Marc/PhotolibraryTime to look around the paintings
The first intrepid explorers to brave the 7-metre crawl through a perilously narrow tunnel leading to the Chauvet caves in southern France were rewarded with magnificent artwork to rival any modern composition. Stretching a full 3 metres in height, the paintings depict a troupe of majestic horses in deep colours, above a pair of boisterous rhinos in the midst of a fight. To the left, they found the beautiful rendering of a herd of prehistoric cows. "The horse heads just seem to leap out of the wall towards you," says Jean Clottes, former director of scientific research at the caves and one of the few people to see the paintings with his own eyes.

When faced with such spectacular beauty, who could blame the visiting anthropologists for largely ignoring the modest semicircles, lines and zigzags also marked on the walls? Yet dismissing them has proved to be something of a mistake. The latest research has shown that, far from being doodles, the marks are in fact highly symbolic, forming a written "code" that was familiar to all of the prehistoric tribes around France and possibly beyond. Indeed, these unprepossessing shapes may be just as remarkable as the paintings of trotting horses and tussling rhinos, providing a snapshot into humankind's first steps towards symbolism and writing.

Until now, the accepted view has been that our ancestors underwent a "creative explosion" around 30,000 to 40,000 years ago, when they suddenly began to think abstractly and create rock art. This idea is supported by the plethora of stunning cave paintings, like those at Chauvet, which started to proliferate across Europe around this time. Writing, on the other hand, appeared to come much later, with the earliest records of a pictographic writing system dating back to just 5000 years ago.

Meteor

Get Set for a Possible Glimpse of an Asteroid

Vesta
© NASA/ESA/U of Md./STSci/Cornell/SWRI/UCLAAsteroid Vesta as seen by NASA's Hubble Space Telescope.
The most prominent asteroid in the sky is currently yours for the perusing with binoculars -- and perhaps even the naked eye.

Tomorrow night, Wednesday, Feb. 17, Vesta, the second most massive object in the asteroid belt, reaches what astronomers like to call "opposition." An asteroid (or planet or comet) is said to be "in opposition" when it is opposite to the sun as seen from Earth. In other words, if you were to stand outside with the sun directly above you at high noon, Vesta would be directly below your feet some 211,980,000 kilometers (131,700,000 miles) away. With Vesta at opposition, the asteroid is at its closest point to Earth in its orbit.

Wednesday night, the asteroid is expected to shine at magnitude 6.1. That brightness should make it visible to interested parties brandishing telescopes or binoculars, and even those blessed with excellent vision and little or no light pollution or clouds in their vicinity. Vesta will be visible in the eastern sky in the constellation Leo.

Pharoah

King Tut likely had club foot, killed by malaria

King Tut's Mask
© AFPA replica of the death mask of Egyptian pharaoh Tutankhamun is on display in 2009 at an exhibition in southern Germany. Tutankhamun had a club foot, walked with a cane and was killed by malaria, a study that harnessed modern genetic testing and computer technology to lift a veil on the secrets of ancient Egypt showed Tuesday.
Washington - The celebrated pharaoh Tutankhamun had a club foot, walked with a cane and was killed by malaria, a study that harnessed modern genetic testing and computer technology to lift a veil on the secrets of ancient Egypt showed Tuesday.

Researchers from Egypt, Italy and Germany used DNA testing to draw "the most plausible" family tree to date for Tutankhamun and computerized tomography (CT) scans to determine that the pharaoh and his forebears were unlikely to have had the feminine physiques they are depicted with in 3,000-year-old artifacts.

They analyzed DNA taken from 11 mummies, including the boy king himself, and scanned all but one of the mummies to determine if they were related, look for evidence of genetic disorders and infectious diseases, and determine what killed Tutankhamun at the age of 19.

Tutankhamum -- who is often referred to as King Tut -- died just nine years into his reign, which lasted from 1333-1324 BC.

Sun

Cheap Solar Cell Could Be Incorporated Into Clothing

A new solar cell can produce the same amount of energy as the best conventional solar panels while using less expensive material.

The novel flexible device could help make solar cells far more practical for products ranging from sunroofs to clothing, scientists say.

"It could be extremely rugged - you could roll it up, even perforate it, shoot holes in it with a gun, and it'd still operate, whereas normal crystalline silicon would just shatter like glass," said researcher Harry Atwater, an applied physicist at the California Institute of Technology at Pasadena, Calif.

Sherlock

3,000-Year-Old Shipwreck Shows European Trade was Thriving in Bronze Age

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© UnknownArchaeologists believe the copper, and possibly the tin, was being imported into Britain
The discovery of one of the world's oldest shipwrecks shows that European trade was thriving even in the Bronze Age, according to experts.

The vessel, carrying copper and tin ingots used to make weapons and jewelery, sank off the coast near Salcombe in Devon and is thought to date from 900BC.

But it was only last year that the South West Maritime Archaeological Group, a team of amateur archaeologists, brought its cargo to the surface.

The discovery was not announced until this month's International Shipwreck Conference, in Plymouth, Devon.

It is thought that the goods - 259 copper ingots and 27 of tin - were destined for Britain but collected from several different sources in Europe.