Tuesday, February 15, 2011

Will we re-create the extinct Mammoths? (submitted by Ximena Alpizar)

Ice Baby

A near-perfect frozen mammoth resurfaces after 40,000 years, bearing clues to a great vanished species.


By Tom Mueller
Photograph by Francis Latreille
The mammoth herd approaches the rushing river. A calf ambles close to her mother's huge legs, brushing their long, glossy hair now and then with her trunk. The sky is brilliant blue, and a dry wind hisses through the grasses, which billow like oceanic swells across a steppe 1o,ooo miles wide, spanning the northern arc of the Ice Age world. The long winter is over; birdsong and the scent of damp loam fill the air.
Perhaps the warmth of the sun makes the mother careless, and for a moment she loses track of her calf. The baby wanders toward the water. She stumbles on the slippery riverbank and slides into a slurry of clay, sand, and fresh snowmelt. She struggles to free herself, but every movement drags her deeper. The mud gets in her mouth, her trunk, her eyes; disoriented, she gasps for breath but gets a mouthful of muck instead. Coughing, gagging, caught in a riptide of panic, she makes a dreadful high-pitched shriek that brings her mother running. Inhaling with all her force, the calf sucks the mud deep into her trachea, sealing her lungs. By the time her mother reaches the bank, the baby is partially submerged in the ice-cold mire and flailing feebly, rapidly sliding into shock. The mother screams and mills on the soft bank, drawing the rest of the herd. As they watch, the calf sinks beneath the surface.
Night falls. The herd moves on, but the mother lingers. Yellow moonlight throws her humpbacked shadow across the glistening mud. The moon sets, and stars glow in the chill heavens. Just before dawn, she takes a last look at the spot where the earth swallowed her baby, then turns and follows the herd north, toward summer pastures.

On a May morning in 2007, on the Yamal Peninsula in northwestern Siberia, a Nenets reindeer herder named Yuri Khudi stood with three of his sons on a sandbar on the Yuribey River, holding council over a diminutive corpse. Though they'd never seen such an animal before, they knew it well from stories their people sang on dark winter nights in their storytelling lodges. This was a baby mamont, the beast the Nenets say wanders the frozen blackness of the underworld, herded by infernal gods just as the Nenets herd their reindeer across the tundra. Khudi had seen many mammoth tusks, the honey-colored, corkscrew shafts as thick as tree limbs that his people found each summer. But he had never seen an entire animal, let alone one so eerily well preserved. Apart from its missing hair and toenails, it was perfectly intact.
Khudi was uneasy. He sensed this was an important discovery, one that others should know about. But he refused to touch the animal, because the Nenets believe that mammoths are dangerous omens. Some Nenets even say that people who find a mammoth are marked for early death. Khudi vowed to placate the infernal powers with the sacrifice of a baby reindeer and a libation of vodka. But first he traveled 150 miles south to the small town of Yar Sale to consult with an old friend named Kirill Serotetto, who was better acquainted with the ways of the outside world. Serotetto listened to his friend's story, then bustled him off to meet with the director of the local museum, who persuaded the local authorities to fly Khudi and Serotetto back to the Yuribey River in a helicopter.
When they arrived on the sandbar, however, the mammoth had vanished.

Mammoths are an extinct group of elephants of the genus Mammuthus, whose ancestors migrated out of Africa about 3.5 million years ago and spread across Eurasia, adapting to a range of woodland, savanna, and steppe environments. The best known of these proboscideans is the woolly mammoth, Mammuthus primigenius, a close cousin of living elephants and about the same size. It first appeared in the middle Pleistocene more than 400,000 years ago, probably in northeastern Siberia. The woolly mammoth was highly adapted to cold, with a dense undercoat, guard hairs up to three feet long, and small, fur-lined ears. Immense curving tusks, used primarily for fighting, may have also been handy for foraging beneath the snow. Because mammoths often died and were buried in sediment that has been frozen ever since, many of their remains have survived into modern times, particularly in the vast deep freeze of Siberian permafrost.

Did Egyptians have Prosthetics? (submitted by Melania Benavides)

Mummy Remains Show False Toes Helped Ancient Egyptians Walk


ScienceDaily (Feb. 14, 2011) — Two artificial big toes -- one found attached to the foot of an ancient Egyptian mummy -- may have been the world's earliest functional prosthetic body parts, says the scientist who tested replicas on volunteers.
University of Manchester researcher, Dr Jacky Finch, has shown that a three-part wood and leather artefact housed in the Egyptian Museum in Cairo, along with a second one, the Greville Chester artificial toe on display in the British Museum, not only looked the part but also helped their toeless owners walk like Egyptians.
The toes date from before 600BC, predating what was hitherto thought to be the earliest known practical prosthesis -- the Roman Capula Leg -- by several hundred years.
Dr Finch, who is based in the University of Manchester's KNH Centre for Biomedical Egyptology, recruited two volunteers whose right big toe had been lost in order to test exact replicas of the artificial toes in the Gait Laboratory at Salford University's Centre for Rehabilitation and Human Performance Research.
Writing in the Lancet, Dr Finch said: "To be classed as true prosthetic devices any replacement must satisfy several criteria. The material must withstand bodily forces so that it does not snap or crack with use. Proportion is important and the appearance must be sufficiently lifelike as to be acceptable to both the wearer and those around them. The stump must also be kept clean, so it must be easy to take on and off. But most importantly it must assist walking.
She continued: "The big toe is thought to carry some 40% of the bodyweight and is responsible for forward propulsion, although those without it can adapt well. To accurately determine any level of function requires the application of gait analysis techniques involving integrated cameras and pressure devices placed along a walkway."
The volunteers were asked to wear the toes with replica Egyptian sandals and, while neither design was expected to perform exactly like a real big toe, one of the volunteers was able to walk extremely well with both artificial toes. No significant elevation in pressure under the foot was recorded for either toe, although both volunteers said they found the Cairo toe particularly comfortable.
The Greville Chester toe -- made from cartonnage, a sort of papier maché made using linen, glue and plaster -- shows considerable signs of wear, while the Cairo toe has certain features, such as a simple hinge, a chamfered front edge and a flattened underside.
"The wear on the Greville Chester toe and the important design features on the Cairo toe led me to speculate that these toes were perhaps worn by their owners in life and not simply attached to the foot during mummification for religious or ritualistic reasons," said Dr Finch.
"However, until we were able to test replicas of both toes using volunteers under laboratory conditions, it remained uncertain if they could indeed help their owners to walk.
"My findings strongly suggest that both of these designs were capable of functioning as replacements for the lost toe and so could indeed be classed as prosthetic devices. If that is the case then it would appear that the first glimmers of this branch of medicine should be firmly laid at the feet of the ancient Egyptians."

Research: Popularity linked to Bullying (submitted by Nina Ferraro)

Study links teenage bullying to social status

As students get more popular, they're more likely to harass their peers, finds a study that reinforces an axiom of high school life.


Scientists have confirmed an axiom of teenage life: Kids intent on climbing the social ladder at school are more likely to pick on their fellow students.

The finding, reported in Tuesday's edition of the American Sociological Review, lends an air of authenticity to TV shows like "Gossip Girl" and the 2004 movie "Mean Girls." More importantly, it may suggest that efforts to combat bullying in schools should focus more closely on social hierarchies.

"By and large, status increases aggression," said sociologist Robert Faris of UC Davis, who led the study.

Faris and a colleague studied the relationships among 3,722 middle and high school students over the course of an academic year and found that the teenagers' propensity toward aggression rose along with their social status. Aggressive behavior peaked when students hit the 98th percentile for popularity, suggesting that they were working hard to claw their way to the very top.

However, those who were in the top 2% of a school's social hierarchy generally didn't harass their fellow students. At that point, they may have had little left to gain by being mean, and picking on others only made them seem insecure, Faris said.

The researchers quantified this by administering surveys to eighth-, ninth- and 10th-graders in 19 schools in North Carolina in fall 2004 and again in spring 2005. Students were asked to name up to five best friends. They were also asked to name up to five students they had picked on in the previous three months, and up to five students who had picked on them.

In cases where aggression occurred, students classified the events as physical attacks, direct verbal harassment or indirect offenses like spreading rumors or ostracizing classmates.

The surveys also asked about the students' grades, participation on sports teams, dating history, race and family income.

The results allowed Faris to create "social maps" of each school, charting all the positive and negative relationships among students.

At the beginning of the school year, 40% of students said they had harassed another classmate; in the second survey in the spring, 33% said they had done so. Higher social status — defined as occupying the hub of a school's social network rather than the periphery — in the fall predicted higher rates of aggression in the spring.

On average, each student was aggressive toward 0.63 fellow students at the end of the school year. A few particularly aggressive students — socially-central athletes — harassed as many as nine kids apiece.

Though the study reinforces popular stereotypes about social cliques in schools, it contradicts academic notions about aggression, Faris said.

"For a long time, there was emphasis on seeing aggression as a product of the home environment," he said. "Here we're getting a different picture."

The findings suggest that anti-bullying programs need to focus on the role of the nonviolent majority of students, said UCLA psychologist Jaana Juvonen, who studies bullying in schools.

"It's really critical for bystanders to speak up," said Juvonen, who wasn't involved in the study. "If there's an aggressive kid everyone bows down to, it sends a signal to the bully that what they're doing is working."

Rosalind Wiseman, a 17-year teaching veteran, said the study reflected the experience of many educators. It was just such behavior that prompted her to write "Queen Bees and Wannabes," the book that inspired the film "Mean Girls," in which a nice and slightly nerdy girl played by Lindsay Lohan becomes increasingly catty as her popularity soars.

"It's always nice to have backup," Wiseman said.

Saturday, February 12, 2011

Bees can recognize human faces (submitted by Carla Pastora)

Bees can recognize human faces, study finds
Dec. 9, 2005
Special to World Science
Honeybees may look pretty much all alike to us. But it seems we may not look all alike to them. A study has found that they can learn to recognize human faces in photos, and remember them for at least two days.
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The findings toss new uncertainty into a long-studied question that some scientists considered largely settled, the researchers say: how humans themselves recognize faces.  The results also may help lead to better face-recognition software, developed through study of the insect brain, the scientists added.

Many researchers traditionally believed facial recognition required a large brain, and possibly a specialized area of that organ dedicated to processing face information. The bee finding casts doubt on that, said Adrian G. Dyer, the lead researcher in the study.

He recalls that when he made the discovery, it startled him so much that he called out to a colleague, telling her to come quickly because “no one’s going to believe it—and bring a camera!”

Dyer said that to his knowledge, the finding is the first time an invertebrate has shown ability to recognize faces of other species. But not all bees were up to the task: some flunked it, he said, although this seemed due more to a failure to grasp how the experiment worked than to poor facial recognition specifically.

In any case, some humans also can’t recognize faces, Dyer noted; the condition is called prosopagnosia.

In the bee study, reported in the Dec. 15 issue of the Journal of Experimental Biology, Dyer and two colleagues presented honeybees with photos of human faces taken from a standard human psychology test. The photos had similar lighting, background colors and sizes and included only the face and neck to avoid having the insects make judgments based on the clothing. In some cases, the people in the pictures themselves looked similar.

The researchers, with Johannes Gutenberg University in Mainz, Germany, tried to train the bees to realize that a photo of one man had a drop of a sugary liquid next to it. Different photos came with a drop of bitter liquid instead.

A few bees apparently failed to realize that they should pay attention to the photos at all. But five bees learned to fly toward the photo horizontally in such a way that they could get a good look at it, Dyer reported. In fact, these bees tended to hover a few centimeters in front of the image for a while before deciding where to land.

The bees learned to distinguish the correct face from the wrong one with better than 80 percent accuracy, even when the faces were similar, and regardless of where the photos were placed, the researchers found. Also, just like humans, the bees performed worse when the faces were flipped upside-down. 

“This is evidence that face recognition requires neither a specialised neuronal [brain] circuitry nor a fundamentally advanced nervous system,” the researchers wrote, noting that the test they used was one for which even humans have some difficulty.

Moreover, “Two bees tested two days after the initial training retained the information in long-term memory,” they wrote. One scored about 94 percent on the first day and 79 percent two days later; the second bee’s score dropped from about 87 to 76 percent during the same time frame.

The researchers also checked whether bees performed better for faces that humans judged as being more different. This seemed to be the case, they found, but the result didn’t reach statistical significance.

The bees probably don’t understand what a human face is, Dyer said in an email. “To the bees the faces were spatial patterns (or strange looking flowers),” he added.

Bees are famous for their pattern-recognition abilities, which scientists believe evolved in order to discriminate among flowers. As social insects, they can also tell apart their hivemates. But the new study shows that they can recognize human faces better than some humans can—with one-ten thousandth of the brain cells.

This raises the question of how bees recognize faces, and if so, whether they do it differently from the way we do it, Dyer and colleagues wrote. Studies suggest small children recognize faces by picking out specific features that are easy to recognize, whereas adults see the interrelationships among facial features. Bees seem to show aspects of both strategies depending on the study, the researchers added.

The findings cast doubt on the belief among some researchers that the human brain has a specialized area for face recognition, Dyer and colleagues said. 

Neuroscientists point to an area called the fusiform gyrus, which tends to show increased activity during face-viewing, as serving this purpose. But the bee finding suggests “the human brain may not need to have a visual area specific for the recognition of faces,” Dyer and colleagues wrote.

That may be helpful to researchers who develop face-recognition technologies to be used for security at airports and other locations, Dyer noted. The United States is investing heavily in such systems, but they still make many mistakes. 
Already, the way that bees navigate is being used to design “autonomous aircraft that can fly in remote areas without the need for radio contact or satellite navigation,” Dyer wrote in the email. “We show that the miniature brain can definitely recognize faces, and if in the future we can work out the mechanisms by which this is achieved,” this might suggest ideas for improved face recognition technologies.
Dyer said that if bees can learn to recognize humans in photos, then they reasonably might also be able to recognize real-life faces. On the other hand, he remarked, this probably isn’t the explanation for an adage popular in some parts of the world—that you shouldn’t kill a bee because its nestmates will remember and come after you. 
Francis Ratnieks of Sheffield University in Sheffield, U.K., says that apparent bee revenge attacks of this sort actually occur because a torn-off stinger releases chemicals that signal alarm to nearby hivemates. Says Dyer, “bees don’t normally go around looking at faces.”

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Thursday, February 10, 2011

Weird Science News of 2010

Onions generate electricity

Gills Onions produces up to 300,000 pounds of peels a day. Rather than waste them, the California company is now using the refuse to run its processing facility. Engineers installed machinery at the plant to grind and press the peels into 30,000 gallons of onion juice, which is fed into an anaerobic digester to produce methane that powers two 300-kw fuel cells. The system also presses the solid remains into 20 tons of onion cake that the company sells as cattle feed. Gills Onions expects the $9.5 million project, which earned this year’s top award from the American Council of Engineering Companies, to pay for itself within six years.

These diamonds were not separated at birth

Scientists disproved claims that two famous blue diamonds, both found in the same region of India in the 17th century, were cut from the same stone. The Hope Diamond, a 45.52-carat diamond at the Smithsonian’s National Museum of Natural History in Washington, D.C., and the 31.06-carat Wittelsbach-Graff Diamond, also on display at the museum until August, have strikingly similar blue color caused by traces of boron and emit nearly identical red-orange phosphorescence under ultraviolet light (shown left). But chemists at the Naval Research Laboratory, working with the Smithsonian, found differences in the atomic structures that prove they aren’t related, ending decades of speculation.

Dandelion – Enzyme = Tire

Scorned as a weed, the dandelion is a potential source of natural rubber, according to scientists at the Fraunhofer Institute in Munich, Germany. The white liquid that seeps from a broken dandelion stalk is natural latex, but the sap is ill-suited for industrial use because it immediately begins to harden. The researchers identified an enzyme in the plant that causes this rapid polymerization and found that the sap can produce five times more latex if the enzyme is chemically “turned off.” Dandelions might make an attractive backup as a rampaging fungus attacks rubber trees in Southeast Asia, where the vast majority of the world’s natural rubber is now grown.

Wireless Eyes

A team of MIT researchers has entered the race to develop an implant that can restore partial vision to the blind. Unlike other implants under development, MIT’s system does not place electrodes directly on the retina, which can damage the eye during implantation. Instead, the device stimulates nerves near the eyeball that carry visual information to the brain. A pair of eyeglasses, equipped with a camera, beams visual information and power to the chip. A coil around the iris relays the images to a chip attached to the side of the eyeball (above), which sends the data to electrodes implanted below the retina. The researchers won’t know what patients would “see” until they begin human trials in 2013.

Listening to Leaves

Western Washington University geophysicists are making localized air-pollution maps by tracking the magnetism of tree leaves. Car and some industrial pollution contains particles of magnetic iron oxide that stick to the leaves, making them magnetic.

Radar-friendly windmills

Thousands of megawatts’ worth of proposed wind farms in the U.S. have been blocked because aviation radar confuses the spinning turbines with aircraft. British defense firm QinetiQ and Danish turbine-maker Vestas have produced a turbine that minimizes radar returns by coating the turbine’s tower with radar-absorbent material and integrating stealthy composites into the blades.


World’s first inflatable seatbelt

Michigan-based Key Safety Systems has unveiled the world’s first inflatable car seatbelt, which enhances a traditional three-point shoulder belt with an airbag. When the vehicle detects a collision, the belt inflates with cold gas to five times its original width. The first belts will appear in Ford Explorers going into production this year.

Air cannon pirate deterrent

Commercial shipping vessels desperate for ways to defend themselves from pirate attacks off the coast of Somalia could soon have a nonlethal way to fight back. The Buccaneer, built by Wales-based BCB International, is a deck-mounted weapon that allows besieged sailors to disable attacking ships. The compressed-air device launches a coiled rope over a quarter-mile.

A parachute attached to one end of the rope controls the descent so that the rope lies across the surface of the water, entangling the propeller shaft of the threatening vessel. Many nations bar commercial ships from being armed, and adding weapons often increases insurance rates because of the risk of accidents. The Buccaneer is an attractive alternative to firearms.


Paper batteries

Scientists at Stanford University recently developed a method to store energy in ordinary paper by coating it with ink infused with carbon nanotubes and silver nanowires. These nanomaterials are great conductors because their one-dimensional structures move electricity efficiently. The result: lightweight, flexible batteries and capacitors.


Melting diamonds with lasers

Just how tough are diamonds? In a coordinated effort to determine exactly how diamonds react in extreme environ­ments, two teams of physicists blasted samples of the gem with powerful lasers—the Janus laser at Lawrence Livermore National Laboratory and the Omega laser at the University of Rochester. The lasers created shock waves of pressure 40 million times the Earth’s atmospheric pressure, melting the diamonds. The researchers then tweaked the lasers to gradually decrease the temperature and pressure to see when solid diamond would re-form. At 11 million times the pressure on Earth, pieces of diamonds began to appear on the surface of the liquefied carbon. The dual experiments lend credibility to a theory that gas giants like Uranus and Neptune have oceans of liquid carbon that are dotted with floating icebergs of diamonds. The data could also encourage more extreme industrial uses for diamonds.

Solar roof shingles

The complex installation of solar panels can be off-putting to many homeowners. To open the market to more people, Dow Chemical created thin-film photovoltaic solar panels that are the size and shape of ordinary asphalt shingles. Installation is easy: They can be nailed into the roof like conventional shingles. Plus, the solar shingles are healthier for homes than solar panels because they don’t use elaborate racking systems that penetrate a roof. Sales of the Powerhouse Solar Shingles are expected to begin late this year.


Stickiness with an on/off switch

Researchers at Cornell University have developed a way to produce instant adhesion that can be activated with a switch. The technique relies on surface tension produced by water droplets as they’re forced through microscopic holes. The charge from a 9-volt battery pumps water through the team’s device, creating a bond; reversing the voltage pulls droplets back through the holes and into a reservoir, releasing the surface. A 1000-hole prototype supports about 70 paperclips; a square-inch device with millions of small holes could support 15 pounds.

Bird-beak compasses are widespread

Many birds have nerve branches filled with iron in their upper beak, enabling them to navigate using the “feel” of Earth’s magnetic fields. German researchers confirmed that these specialized dendrites, first detected in homing pigeons, also exist in birds such as robins, warblers and even chickens, which don’t migrate. This suggests the extra sense appeared early in avian evolution.

A single ion tells time

A single aluminum ion, vibrating a quadrillion times a second, is the basis for a new “quantum logic” clock developed by the National Institute of Standards and Technology. A prototype of the clock remains accurate to within a second every 3.7 billion years—significantly better than the current U.S. civilian time standard, a cesium fountain clock accurate to within a second every 100 million years. The General Conference on Weights and Measures, based in France, may consider the design for a new international time standard. Such precise clocks are used to synchronize telecommunications networks and deep-space communications and to assist satellite navigation and positioning. They could also lead to new types of space-based gravity sensors, used to locate underground natural resources.


Hot chili grenade

The Indian military has weaponized the world’s hottest chili pepper, the bhut jolokia, or “ghost chili.” The infamous pepper rated at more than a million Scoville units, the scientific measurement of a chili’s heat. In comparison, jalapeño peppers max out at 8000 units. Compounds from the chili will be used in a hand grenade that, like tear gas, can overwhelm an aggressor.

Skin doubles as computer hardware

As portable electronics shrink, our fingers become too large to press tiny buttons and our eyes too weak to read small screens. A computer science Ph.D. at Carnegie Mellon University has come up with a novel solution: use the human body as a proxy. To work, the device projects a screen and keypad onto the skin. Piezoelectric vibration sensors detect taps and finger flicks and translate them into commands. A prototype of the “Skinput” system straps to the upper arm, but the researchers expect future versions to shrink to the size of a wristwatch.


Methane eaters on Mars?

A team of researchers working with the SETI Institute has found creatures in a desolate Arctic spring whose existence hints at a new kind of life that could possibly thrive on Mars. The water of Lost Hammer, a spring on Canada’s Axel Heiberg Island, contains bubbles of methane that steadily rise to the surface. While searching in the frozen pool for organisms that emit methane, the researchers instead found anaerobic bacteria that utilize methane as a source of energy and carbon. The spring’s mix of methane and ice mirrors past conditions on Mars, leading the team to speculate that similar life forms could have evolved there.

Airplanes can trigger rainstorms

Findings from the National Center for Atmospheric Research show that airplanes can trigger rain or snow simply by flying through clouds composed of supercooled water droplets. As the droplets pass over propellers or wings and into the cooler wake, they freeze and fall to the ground, creating distinctive “hole punch” clouds that are sometimes seen in the sky.

Rapid hands-free climbing device

Atlas Devices has created a climbing aid for the Navy that can hoist up to 500 pounds with the press of a button. Personnel can use the Power Ascender to quickly scale the hulls of vessels during boarding operations or to drop from helicopters without rescue booms. The rope weaves through the Ascender between rollers on a spindle: Rotate the spindle one way and the climber ascends; a button changes its direction for the descent. Rock climbers, look elsewhere—Atlas is only marketing the device to the military and to civilian first responders.
 
Makes me wonder what the weird science news of 2011 will be...

Wednesday, February 9, 2011

Do you like to write?

I co-authored a story in one of my college classes with two of my classmates. Check it out here:
http://www.authorstream.com/Presentation/aSGuest82099-774163-the-legend-of-plesiosaurus-final-2/

10 Class Rules

1. Do your best
2. Stay in your seat until you get permission to leave it
3. Raise your hand to ask questions (and don't forget to pause until Ms. H2Os calls on you)
4. Know the finger rules
    1 finger: I need to go to the borrow bin (don't forget
    to leave me a shoe until you return it)
    2 fingers: I need to sharpen my pencil
    3 fingers: I need to go to the bathroom
5. Be respectful of your teacher and classmates
6. Keep your lockers neat (remember Ms. H2Os is OCD about organization)
7. Only water is allowed in class
8. Be prepared for class (textbook, notebook, pen, folder)
9. Have a great attitude
10. When in doubt, always ask questions

Can you think of something else that we need to add to our class rules? Just leave a comment on this post and we will discuss it in class.