Crocs Uncover

Bizarre Species

lunes, 4 de mayo de 2009

Earth Still Recovering From A Glacial Hangover


Sediment-charged waters disgorge from beneath the Franz Josef Glacier, New Zealand. (Credit: Damon Teagle)A new explanation for the cause of changes in the chemical makeup of the oceans through recent Earth history is put forward in a paper published in Nature.
Scientists from the Universities of Southampton and Bristol suggest that adjustments in ocean chemistry through recent geological time are driven by variations in the intensity of chemical breakdown of continental rocks by rain and ground water. These changes are, in turn, controlled by the profound changes in the Earth's climate, and in particular the Ice Ages, that have occurred over the past 2-3 million years.

The elements that give seawater its distinctive saltiness are mostly supplied in dissolved form by rivers. Rivers, in turn, receive these elements from runoff that has reacted with and partially dissolved rocks, a process known as chemical weathering. Another major source of dissolved material to seawater is submarine “black smoker” hydrothermal systems. Movement of seawater through young, hot rocks at the mid-ocean ridges causes leaching of some elements from sea-floor basalts, as well as the precipitation out of solution of some constituents of seawater. Thus, these hydrothermal systems are both a source of dissolved material to the oceans and also a means by which some others are lost. The other major output of dissolved material from the oceans is to marine sediments, which are principally made up of the shells of dead marine organisms. Imbalances in these inputs and outputs cause changes in the chemical make-up of the oceans through time.

The team, led by Dr. Derek Vance of the University of Bristol, draws on records of past ocean chemistry preserved in deep-sea sediments to point out that some aspects of the chemistry of seawater have been changing too slowly over the past 2-3 million years given what is known about the sizes of the inputs and outputs to the oceans. The paper challenges the prevailing notion that this inconsistency is caused by inaccuracies in estimates of the impact of submarine hydrothermal systems on ocean chemistry, or that we don’t have accurate measurements of river chemistry and run off. Instead, they point to changes in continental chemical weathering rates caused by profound climate change operating over the past 2-3 million years.

Dr Vance explains, “Chemical weathering rates have been periodically perturbed in recent Earth history because the ice-sheets and glaciers produced during the great ice ages have physically ground rock up to smaller and smaller grain sizes. In the succeeding hotter and wetter ‘interglacial’ periods, this ground up rock is very susceptible to chemical weathering.” All chemical reactions occur faster if the substrate is finer grained because there is more surface area for reaction to take place – this is why school chemical experiments use iron filings instead of a block of steel!

One of the main conclusions is that in the instant of geological time represented by, say, the last 100 years, landscapes remain significantly perturbed by this process. Co-author Professor Damon Teagle, of the University of Southampton’s School of Ocean and Earth Science, based at the National Oceanography Centre, Southampton, explains, “The Earth emerged from the last Ice Age only 10,000 years ago, and chemical weathering is still playing ‘catch-up’ with the massive production of reactive, fine-grained particles produced during the last Ice Age.” As a result the measurements of the chemistry of rivers that scientists are currently making, although an accurate estimation of the modern Earth, are not representative of the past few million years.

The team conclude the paper by assessing some of the implications. One of these is the potential impact on the natural greenhouse effect on planet Earth. Chemical weathering not only dissolves rocks, it reacts atmospheric CO2 with those rocks and takes CO2 out of the atmosphere. This carbon is also washed into the oceans in dissolved form, where it is incorporated into the calcium carbonate shells of marine organisms, which in turn die and accumulate in deep ocean sediment.

On very long timescales – longer than hundreds of thousands of years – the amount of CO2 in the atmosphere represents a balance between that emitted as volcanic gases versus that the amount taken up by chemical weathering. The conventional view of the long-term evolution of Earth's climate is that chemical weathering and CO2 act together to thermostatically regulate the Earth's surface temperature. If for some reason atmospheric CO2 increases, the resulting higher temperatures cause greater chemical weathering, which acts to reduce the CO2 concentration of the atmosphere.

The team further suggest that during Ice Ages, this thermostat could be over-ridden due to glaciers grinding up much greater quantities of rock, which results in much higher rates of chemical weathering, leading to increased removal of CO2 from the atmosphere. Bristol's Gavin Foster remarks "this means that in periods like the last 2-3 million years, higher chemical weathering rates could act to maintain ‘icehouse’ conditions once they have started". However, no one should make the mistake of thinking that these processes could extract us from the modern predicament of high and rising atmospheric CO2. The natural processes discussed in this article are slow and, although crucial on geological timescales of hundreds of thousands to millions of years, are not relevant to the short span of modern industrialised society.

Super-sensors To Discover What Happened In First Trillionth Of A Second After Big Bang


The cosmic microwave temperature fluctuations from the 5-year WMAP data seen over the full sky. The average temperature is 2.725 Kelvin (degrees above absolute zero; equivalent to -270 C or -455 F), and the colors represent the tiny temperature fluctuations, as in a weather map. Red regions are warmer and blue regions are colder by about 0.0002 degrees. (Credit: NASA / WMAP Science Team)


What happened in the first trillionth of a trillionth of a trillionth of a second after the Big Bang?
Super-sensitive microwave detectors, built at the National Institute of Standards and Technology (NIST), may soon help scientists find out.

The new sensors, described May 2 at the American Physical Society (APS) meeting in Denver, were made for a potentially ground-breaking experiment* by a collaboration involving NIST, Princeton University, the University of Colorado at Boulder, and the University of Chicago.

Although NIST is best known for earthbound measurements, a long-standing project at NIST's Boulder campus plays a critical role in the study of the cosmic microwave background (CMB)—the faint afterglow of the Big Bang that still fills the universe. This project previously built superconducting amplifiers and cameras for CMB experiments at the South Pole, in balloon-borne observatories, and on the Atacama Plateau in Chile.

The new experiment will begin approximately a year from now on the Chilean desert and will consist of placing a large array of powerful NIST sensors on a telescope mounted in a converted shipping container.

The detectors will look for subtle fingerprints in the CMB from primordial gravitational waves—ripples in the fabric of space-time from the violent birth of the universe more than 13 billion years ago. Such waves are believed to have left a faint but unique imprint on the direction of the CMB's electric field, called the "B-mode polarization." These waves—never before confirmed through measurements—are potentially detectable today, if sensitive enough equipment is used.

"This is one of the great measurement challenges facing the scientific community over the next 20 years, and one of the most exciting ones as well," said Kent Irwin, the NIST physicist leading the project.

If found, these waves would be the clearest evidence yet in support of the "inflation theory," which suggests that all of the currently observable universe expanded rapidly from a subatomic volume, leaving in its wake the telltale cosmic background of gravitational waves.

"The B-mode polarization is the most significant piece of evidence related to inflation that has yet to be observed," said Ki Won Yoon, a NIST postdoctoral scholar who will describe the project at the APS meeting. "A detection of primordial gravitational waves through CMB polarization would go a long way toward putting the inflation theory on firm ground."

The data also could provide scientists with insights into different string theory models of the universe and other "unified" theories of physics.

These types of experiments can only be done by studying the universe as a whole, because the particles and electromagnetic fields at the beginning of the inflationary epoch were roughly 10 billion times hotter than the energies attainable by the most powerful particle colliders on Earth today. At this energy scale, fundamental forces now identified as separate are predicted to merge.

"The universe is a physics lab," Irwin said. "If you look far away, you are actually looking back in time, potentially observing interactions that occurred at energy levels forever out of reach of terrestrial experiments."

Recent studies of the CMB have focused on measuring slight spatial variations in temperature or power that existed about 380,000 years after the Big Bang. These patterns of radiation allow scientists to characterize the early distributions of matter and energy that evolved into the stars and galaxies of today.

By comparing the measurements to predictions made by various theories, scientists have added to the authoritative history of the universe, narrowing down, for instance, its age (13.7 billion years).

By contrast, the new NIST detectors are designed to measure not only temperature but also the polarization. The B-mode polarization signals may be more than a million times fainter than the temperature signals.

To detect such subtle patterns, the NIST detectors will collect significant amounts of radiation efficiently, and will be free of moving parts and traditional sources of systematic error, such as vibration and magnetic interference, Irwin said. In addition, advanced signal processing and error control will be needed.

The new sensors are prototypes for NIST polarimeter arrays that will greatly increase the sensitivity of future experiments by building thousands of detectors into monolithic units that can be deployed in cryogenic telescope cameras. The new NIST detectors may also have applications closer to home, such as in reducing glare in advanced terahertz imaging systems for detecting weapons and contraband.

Ancient Egypt Temples Found at Gateway Fortress


Ancient Egyptian pharaoh Ramses II (right) offers gifts to Geb, god of earth, in a 3,000-year-old carving discovered in the largest mud-brick temple yet found on northeastern Egypt's northern Sinai Peninsula (map).

The landmark is among four ancient temples discovered at a site near the Egyptian border near the Suez Canal, the country's archaeology agency announced on April 21.

Found among the ruins of a fortified city, the temples would likely have been the first stop in Egypt for travelers from ancient Palestine and other points east. Designed to impress on visitors Egypt's grandeur and might, the city appears to have been the Egyptian military's headquarters during the New Kingdom (1539-1075 B.C.), a time of war and conquest (ancient Egypt time line).

"This temple was very, very beautiful. [Visitors] would understand this temple is a good example of Egyptian culture," said Mohamed Abdel-Maqsoud, who made the discovery for Egypt's Supreme Council of Antiquities.



Its foundations revealed by recent excavations, this 60,000-square-foot (5,600-square-meter) colonnaded structure was the largest of four newfound temples structures on Egypt's Sinai Peninsula, all built about 3,000 to 3,500 years ago.

Built during different reigns, the temples and other ruins in the former fortified city--known as Tell El-Habua--are testament to the importance of the site. "Each king in the New Kingdom [period] built something there," archaeologist Abdel-Maqsoud said.

Invaders would have had to penetrate 49-foot-thick (15-meter-thick) walls after making it past 15 six-story-tall defensive towers, Egypt's archaeology agency says



Archaeologists have found about 60 inscribed two-ton limestone blocks at Egypt's 3,000-year-old Tell El-Habua site--such as this one from the doorjamb of the temple of Thutmose II, the earliest pharaoh depicted at the site, whose discovery was announced April 21, 2009.

"There're not many inscriptions from North Sinai, but now we've opened the gate, and I'm sure we'll find many more," said archaeologist Abdel-Maqsoud, after 25 years of exploring the area.

All the inscriptions will be transferred to the Egyptian Museum in Cairo.



In a rare inscription found at Tell El-Habua, the ancient eastern gateway to Egypt, Pharaoh Thutmose II is given an ankh, or key of life, by Ra-Horakhty--an amalgamation of the sun god Ra and the falcon-headed Horus. Such artistic intermingling of kings and gods identifies Tell El-Habua site as a religious center, as well as a military base.

The site formed part of the Horus Way--a long road of fortifications that protected Egypt's eastern front from invaders--and was a key starting point for military campaigns during Egypt's acquisitive New Kingdom period.

Searching for Shangri-La


A cheerful group of Chinese tourists, all from eastern cities, are pushing against an enormous Tibetan prayer wheel.

On a bus tour of China's wild west, they're having fun trying to get the giant instrument spinning. No less than 50 feet tall and 25 feet in diameter, the Fortunate Victory Prayer Wheel depicts, in bas-relief, China's 56 ethnic groups working together in fabled harmony.


Three maroon-robed monks, shorn and strong, arrive to give a hand. The tourists have been trying to push the prayer wheel counterclockwise—the wrong direction in Tibetan Buddhism. The monks reverse their energy and get the wheel twirling like a gargantuan top.

Someone's cell phone trills a Chinese pop tune. A woman in lavender tights digs into her oversize purse. A man in a suit reaches into his black leather overcoat. A girl in plaid Converse high-tops rummages in her silver backpack. But it is one of the monks who steps away from the wheel and pulls the gadget from the folds of his robe.

He shouts into the phone while staring out across the city below. There is the Paradise Hotel, a five-star colossus enclosing a swimming pool and an enormous white plastic replica of sacred Mount Kawagebo. There, sprawling in all directions, are gray concrete tenements. There, against a far hillside, is the restored 17th-century Ganden Sumtseling Monastery, a smaller but no less inspiring version of the grand Potala in Tibet, gleaming in the wood-smoke haze like an imaginary palace.

Welcome to Shangri-La.


A decade ago this was an obscure, one-horse village on the edge of the Tibetan Plateau. Today, after an extreme makeover, it's one of the hottest tourist towns in China, gateway city to the Three Parallel Rivers World Heritage site in northwestern Yunnan Province.

Ten years ago the original village was becoming a ghost town of derelict buildings and deserted dirt roads. Most residents had moved out of their traditional homes—commodious chalet-like farmhouses with stone walls and magnificent wooden beams—into more modern structures with running water and septic systems. The historic quarter they left behind seemed doomed.

Tourism saved the place. The Tibetan farmhouses were suddenly rediscovered as unique, endemic architecture that could turn a profit. Redevelopment began immediately. Water and sewer lines were buried beneath the crooked lanes. Electricity and the Internet were snaked in. The old homes were rebuilt and turned into fancy shops. New shops were constructed in the same style but with baroque facades—ornately carved dragons and swans and tigers—to attract Chinese tourists. Which they did: More than three million tourists, almost 90 percent of them Chinese, visited Shangri-La last year.

Take for instance the woman in black leather pants who steps out of a Hummer in the parking lot of the Sumtseling Monastery, hands off her little purse, and climbs up on a wildly decorated yak tended by an elaborately costumed Tibetan, sword and all. Her friends snap photos. She could as easily be a tourist mounting a horse in Deadwood, South Dakota, or standing beside a buffalo in Jackson Hole, Wyoming. Just as Native American culture has been commodified in the American West, Tibetan culture has been commercialized in China's west. In the old town, high-end shops selling faux Tibetan jewelry, knives, and furs—the spotted cat skins are actually dyed dog hides—have replaced the chickens and pigs that once inhabited the ground floors of Shangri-La's homes.

At the giant prayer wheel the tourists and monks have tired of the gilded merry-go-round and are leaving, when an elderly Buddhist woman arrives. She's wearing a traditional wool apron, but it is filthy, as if she'd walked a great distance and performed many prostrations along her pilgrimage. A fuchsia head scarf is plaited into her graying braids. She is thumbing through 108 prayer beads while repeating in a humming whisper the holy mantra om mani padme hum, a prayer for compassion and enlightenment.

The old woman grabs the rail of the giant spindle and, throwing her full weight into this act of devotion, keeps the wheel turning.

Unlike other places with mythically resonant names, such as Timbuktu or Machu Picchu, Shangri-La never actually existed until now. The name comes from James Hilton's 1933 novel, Lost Horizon, a tale of plane-crash survivors who find their way to a utopian lamasery called Shangri-La in the wastelands of Tibet. In the book the lamasery, founded in the 18th century by a Catholic missionary named Perrault and now administered by a high lama, sits at the base of a mountain called Karakal, a fulgent pyramid of snow and rock. Home to more than 50 monks from nations around the world, all deep in spiritual studies, the lamasery is a grand repository of humanity's wisdom, embracing the best of both East and West. Midway through the novel readers discover that the high lama is actually Perrault himself. He's more than 200 years old, having been well preserved by serious study, the immersional serenity of Shangri-La, and isolation from a modern world mindlessly drifting toward holocaust.



Hilton is said to have taken his inspiration for Shangri-La in part from the writings of the eccentric botanist Joseph Rock, whose tales of exploration and adventure in remote Yunnan, Tibet, and elsewhere appeared in this magazine from 1922 to 1935. The irascible Rock led expeditions in search of exotic plants and unknown cultures. He wrote of sliding over the Mekong on a bamboo zip line, of attacks by brigands, of mysterious rituals and meetings with kings. Rock's flair for the flamboyant must have captivated Hilton, a British romantic who wrote 22 novels, including Good-bye, Mr. Chips.

Hilton also drew from another source, one much older than the writings of Joseph Rock. Shangri-La sounds like—and almost certainly is—a thin disguise for Shambhala, the earthly paradise in Tibetan Buddhism where there is no war and no suffering, and where people live in peace and harmony through meditation and self-discipline. In Buddhist texts Shambhala is said to reside beyond the Himalaya at the base of a crystal mountain, its inhabitants untouched by the venality and avariciousness of the outside world. For Hilton, born in 1900 and witness to the devastation of World War I and the Depression, this alluring Eastern legend would have had powerful appeal.

Mix a novelist's imagination with Tibetan mythology, add a dash of Joseph Rock and a generous helping of longing, and you get a nice recipe for Lost Horizon. Although the novel is rarely read today, the word Shangri-La and what it symbolizes—a faraway place of beauty, spiritual replenishment, and supernatural longevity —have long been part of world pop culture.

Of course the problem with the book is the problem with all utopian narratives: It downplays the negative but no less natural afflictions of humankind, such as jealousy, lust, greed, and ambition. In the end, this makes both the book and its unifying theme, Shangri-La, seem simplistic—precisely the opposite of the modern-day city of Shangri-La, a place that could hardly be more complicated or confounding.

In its previous incarnation, Shangri-La was Zhongdian, a 10,000-foot-high trade-route town located just east of some of the deepest and most dramatic gorges in the world. Three great rivers—the Yangtze, the Mekong, and the Salween, separated by towering mountain ranges and known hereabouts as the Jinsha, the Lancang, and the Nu—all sweep east of the Himalaya, then drop due south in tight parallel formation before pouring off in different directions. This was the remote region that Rock explored in the 1920s and '30s.


But much has changed since then. Large-scale commercial logging began in the 1950s. Roads were gouged into the mountains, and thousands of acres of old-growth forest were clear-cut from the sheer slopes. By the mid-1990s, more than 80 percent of the area's income came from timber operations. Then in 1998, due in part to overlogging of the Jinsha catchment, the river flooded. Nearly 4,000 people died, and millions lost their homes. In response, the Chinese government banned all commercial logging in the Three Rivers region.

Forced to retool its economy, Zhongdian turned to tourism, capitalizing on its distinctive architecture and proximity to stupendous geography. At the time Zhongdian had no airport, and it took two days on a rough road to reach the town from Kunming, the nearest major city. An airport was built in 1999, and the Kunming road was finished a year later. By 2001, revenues from the tourist industry had already surpassed what had once come from logging.

That same year, after considerable lobbying, canny local officials were given authorization from Beijing to rename their town and county Shangri-La—a marketing coup, given how many other savvy villages in Yunnan and Sichuan were vying for the famous appellation. The Fortunate Victory Prayer Wheel was erected the next year, and hotels and gift shops began sprouting like the expensive matsutake mushrooms that Tibetans pick in the summer for export to Japan.

The crowning tourist-catching achievement came in 2003 when the United Nations officially acknowledged the prodigious biodiversity of the river gorges and designated the region the Three Parallel Rivers World Heritage site. Instantly, Shangri-La became the new hot spot for Chinese travelers willing to pull on hiking boots and experience the frontier firsthand.

Fed by monsoon storms, the three great rivers have bulldozed staggeringly deep chasms that often exceed 10,000 feet, twice the depth on average of the Grand Canyon. The World Heritage site also embraces more than a hundred peaks higher than 16,000 feet. Because of the stunning verticality, ecosystems can range from subtropical to arctic-like in the space of mere miles.



Described by the UN as the "epicenter of Chinese biodiversity," Three Parallel Rivers has more than 6,000 vascular plant species—more than 200 types of rhododendrons, 300 species of timber trees, and some 500 medicinal plants. With such floral diversity, it follows that the fauna would also be extensive. There are at least 173 mammals—including rare species such as the clouded leopard and red goral—as well as more than 400 types of birds.

Radical topography also engendered human diversity. Separated by uncrossable rivers and soaring mountains, individual ethnic groups developed distinct languages and traditions unique to their own environments. Three Parallel Rivers has at least a dozen ethnic groups, including Tibetan, Yi, Naxi, Lisu, and Nu, comprising some 300,000 people.

World Heritage designation is meant to preserve irreplaceable environmental and cultural diversity, so it's ironic that the Three Parallel Rivers charter doesn't protect the rivers themselves. One reason is that much of the natural habitat along the rivers has been affected by human settlement. But excluding the rivers serves another purpose: meeting China's desperate need for energy. Eighty percent of the country's electrical supply is provided by coal-fired power plants. But coal is dirty energy, and air pollution endangers the health of millions of Chinese. Hydropower, which now generates 15 percent of China's electricity, represents an obvious, and controversial, alternative. A dozen dams are planned for the Jinsha, four of which are already under construction. The Lancang has three existing dams, with two more being built, and up to nine more proposed. Only two dams have been built on the Nu, but a proposal put forward in 2003 called for 13 more. Alarmed, activists have been toiling to save the river.

"Damming the Nu has become a national debate in China," says Yu Xiaogang, founder of Green Watershed. So far Yu, along with environmental journalists and academics, has helped block further dam construction on the Nu and reduce the number of proposed future dams from 13 to four. But given the ballooning energy needs of China and nearby countries—much of the electricity is intended for sale outside China—at least some of the proposed dams will likely be built soon.

While the nearest of the monumental gorges lies within easy reach of the tourist hotels in Shangri-La, almost none of the biological diversity of the Three Parallel Rivers region can be found near the city. If another Shangri-La exists—a place of seclusion and serenity resembling the spellbinding myth in our collective imagination—it must lie out where Rock discovered a beguiling if brutal place that Hilton transfigured into a paradise. That's where I went looking for a truer Shangri-La.
Cutting through snowdrifts beneath an archway of prayer flags snapping like whips, my hiking companion, Rick Kent, and I are literally blown off 16,000-foot Shu Pass, thrown from Yunnan Province across the knife-edge border into Tibet. We're crossing from the Lancang watershed into the Nu watershed. The flat-line distance between the two rivers is 22 miles, but the landscape here is anything but flat. Mount Kawagebo, the highest mountain in Three Parallel Rivers, soars to more than 22,000 feet, its summit during this season hidden in clouds.

The two-day climb to the pass starts at 7,000 feet, where the Lancang is broad and brown with mud and the hillsides are spiked with cactus—the valley so warm that farmers are growing grapes. Every thousand feet above the river brings a new ecozone: crackling deciduous forests, yellow leaves strewn on the trail like brooches; evergreen broad-leaved forests silent as a shadow; temperate coniferous forests with pungent, almost foot-long pine needles webbed in strands of lichen; alpine meadows with green grass knifing up through snow.

Above it all, Mount Kawagebo rises out of the mist like a monster, its summit ominously loaded with cornices of snow hundreds of feet deep. Seventeen Japanese and Chinese climbers died in an avalanche there in 1991. The mountain is now closed for climbing, not because of the danger but in deference to its religious significance. Kawagebo is one of the most sacred peaks in Tibetan folklore. Every year thousands of Buddhist pilgrims circle the massif on foot on a two-week kora, or circular path, the purpose of which is to seek purification and thereby ensure a more propitious reincarnation.

But times are changing. We can hear one group of pilgrims—all Tibetan youths, singing and giggling—before we see them. They pass us like a circus troupe. No solemn, somber affair for these kids, a pilgrimage is a big party. One of them is waving a Chinese MP3 player, the volume turned up to a tinny blare.

Dropping continuously, the trail becomes so steep it starts to switchback every 20 feet, the path a two-foot-deep trough worn into the soft rock. Snow gives way to talus, then to trees, then to dense forest. At an overlook I peek down through a hole in the strands of gray lichen as if into another world. Thousands of feet below us, wedged in the crook of a valley beside a steep, old-growth forest, is a tiny square of brilliant green—another vision of Shangri-La.



It takes hours, descending hundreds of switchbacks, to reach the enchanted place. A man with a load of wood on his back is waiting. He leads the way beneath a giant walnut tree, down through skittish pigs and oblivious goats, over a stone fence, along a neon barley field, to a whitewashed, fortress-like Tibetan home. Up a dirt ramp, we pull the leather thong, a little door opens, and we step into the 15th century. A shrunken woman in a red head wrap greets us with both hands, pours two cups of boiling yak butter tea, then disappears.

The floor plan is traditional Tibetan: In the center is a large, open-to-the-sky atrium, warm sunlight dropping inside. A wooden railing—set with planters of various herbs—boxes in the atrium on the main floor, keeping crawling kids from falling to the ground floor, where pigs and chickens live in splendid squalor. Up a hand-hewn ladder is the roof, a flat mud surface with the atrium cut from the middle. The roof is covered with stores of food and fodder: pine cones piled like pineapples, two varieties of corn, chestnuts spread across a plastic tarp, walnuts on another tarp, three varieties of chilies in various stages of drying, green apples in a basket, sacks of rice, slabs of pork air-drying, the carcass of what appears to be a marmot.

Grandparents, parents, kids, and an uncle all share the farmhouse. All have their tasks: the scrawny uncle carrying sacks of corn and sorting horseshoes; the young mother, baby on back, tending the stove and preparing dinner; the patriarch slowly writing something in a ledger in shaky Tibetan script. The sinewy woman who served us tea is the matriarch. She slops the hogs with a kitchen pail, dumping the contents over the railing, then goes outside, where she milks the cows and feeds the horses and churns the yak butter. Through pantomime she explains that she has pain behind her eyes and asks us for medicine. All I have is ibuprofen.

At nightfall it is pitch-dark and frosty inside the house. A terrific screeching cuts the stillness. The patriarch is turning a metal crank mounted on the wall, winding up a cable. As he locks the crank arm in place, compact fluorescent lightbulbs dangling around the house burst to life. The metal cable, it turns out, extends to a creek 400 yards from the farmhouse. There it attaches to a trough carved from a log. Turning the crank pulls the cable, which lifts the trough, sending a flow of creek water into a large wooden cask. Plugged into the base of the cask is a blue plastic pipe that carries water down to a Chinese-made micro-hydropower generator the size of a five-gallon drum.

Dinner is served. Rice with assorted dishes—pork fat in garlic sauce, yak meat with peppers, fried vegetables, glasses of homemade, throat-scalding barley wine, apples for dessert. And then the patriarch opens a carved cabinet door and clicks the remote. There's a soccer match on TV he doesn't want to miss.


The women of the household are up for hours before dawn, hauling water and wood, milking and feeding the animals. The young mother pours us yak butter tea. Her name is Snaw. She is wearing a black baseball cap embroidered with a skull and crossbones, a tattered purple sweater through which you can see her bony body, a thin, fake-fur scarf, tight jeans, and green Chinese army sneakers. Her baby in one arm, she is simultaneously breast-feeding, loading firewood into the stove, checking the rice, stirring the yak butter tea, tossing potato peels over the railing to the pigs, washing dishes, sorting peppers, and talking.

Snaw is 17. Her baby is three months old and has some indiscernible medical problem. She says her dream is to leave this place—the Shangri-La of my imagination—and go to the real town of Shangri-La. She's heard that women her age go to school there and on Saturday go shopping, walking arm in arm along the mall.

Some young women's dreams have already come true. Yang Jifang, a tall, striking 22-year-old Naxi woman, graduated from the Eastern Tibet Training Institute (ETTI) in downtown Shangri-La. There she learned English and computer skills; she now works as a guide at the Khampa Caravan, an adventure-travel firm. She has her own apartment and goes back to her rural village every month, bringing money and medicine to her parents.

"Life for my parents in the village is very hard," she says. "There is no business, just farming."

The training institute was founded in 2004 by Ben Hillman, a professor at the Australian National University who specializes in development in western China. The institute hosts an intensive 16-week, live-in, fully funded vocational school designed to help students from rural areas bridge the gap to urban job opportunities.

"Culture is something that's constantly evolving," says Hillman, who warns me not to apply a Western sense of authenticity to the modern Shangri-La. We're sitting at the Raven café in the old town, listening to Dylan and drinking Dali beer. The Raven, a rebuilt cobbler's shop, is the kind of funky coffee bar you find in Kathmandu—carrot cake on the menu, a poster of John Coltrane on the wall. Owned by a Seattleite and a Londoner, it's operated by two independent Tibetan women.

"Economic development can rekindle interest in cultural heritage, which is inevitably reinterpreted," Hillman says. "I don't think we can judge that without reverting to some kind of elitism, where wealthy and fortunate people who can travel to remote parts of this planet want to keep things locked in a cultural zoo."


The real challenge for Shangri-La's ethnic minorities, Hillman says, is to develop skills for the modern world. "They are traditionally agropastoralists, experts at subsistence farming—growing barley, raising yaks and pigs. But these aren't the skills that most youth need today."

His students hail from disparate ethnicities—Tibetan, Bai, Lisu, Naxi, Han, Yi—but most come from dirt-poor farming households. All had to beg their parents to let them attend this school, a place of clean-scrubbed classrooms, dorm rooms, and a homey kitchen. None intend to return to hardscrabble farm life. The training institute is the kind of place Snaw dreams about while milking yaks in a freezing snowstorm.

Late in the afternoon several graduates of the institute sit together on a couch in the teachers' lounge, so excited to tell their stories that they can hardly contain themselves. The last to speak is Tashi Tsering, a lanky, vibrant 21-year-old with a shock of jet black hair in his face. A Tibetan, he too learned English and service industry skills at ETTI and now works as a guide, taking tourists to Tibetan towns and villages as far away as Lhasa. Conscious that he has escaped a life of drudgery, he wishes his friends back in the village could have the same opportunity he has enjoyed. "Now I can play an important role in the future!" he says.

Tsering looks over at his fellow alums with pride, then out the window at bustling Shangri-La, the construction cranes swinging over stone farmhouses, the taxis swerving around horse-drawn carts, tourist trinkets on sale next to great slabs of yak meat. His eyes follow a plane descending into the Shangri-La airport.

We can't see it from here, but in the center of the first intersection leaving the airport stands a large white stupa, a sacred Tibetan monument that Buddhists walk around clockwise, the same direction a prayer wheel spins. But cars negotiating the intersection must circle the stupa counterclockwise. Consequently, Buddhist tradition sends women bent beneath giant loads of cornstalks, heading home to feed their pigs, and men herding yaks as they have for centuries, straight into the paths of oncoming busloads of tourists. There have been collisions, but somehow it's working. 

Spacecraft Will Take Amazing Pictures of the Sun



The Mars Phoenix lander had enough personality to write a lively twitter feed, and now the Solar Dynamics Observatory seems to be ready for its own Hollywood movie.

To promote the upcoming mission, Chris Smith, made this Pixar-esque video clip in his spare time while working at NASA Goddard Flight Center.

“It’s a really fun little piece,” says Wade Sisler, a television producer for the space agency. “And we’re hoping to use it as a way of waking some kids and folks up to solar science.”

An Atlas 5 rocket is scheduled to carry the satellite to space in mid-October. The observatory will reach a geosynchronous orbit above New Mexico, and gather data that could help scientists understand solar flares and other phenomena that cause extreme weather conditions in space while disrupting radio communications on Earth.

“You’re going to be getting an HD image of the sun every second when that puppy goes up there,” says Sisler.

viernes, 1 de mayo de 2009

Dynamite Used To Reveal New Layer Of Dinosaur Fossils


Sauropod skull from Lower Cretaceous quarry. (Credit: NPS Photo)

What do you do when you have a fossil quarry that has yielded some of the most important and rarest of dinosaur fossils in North America, but the fossil-bearing layer of rock is tilted at 70 degrees and there is so much rock that not even jackhammers can get you to the fossils any longer?

That was the problem facing Dinosaur National Monument at a Lower Cretaceous dinosaur quarry -- the one that has produced the only complete brontosaur skulls from the last 80 million years of the Age of Dinosaurs in North America. The site is so scientifically important that excavations cannot be stopped, yet there was no way to reach the bones.

Dave Larsen, Steve Bors, and Tim George, a blasting team from Rocky Mountain National Park, rode to the rescue in mid-April. Over several days these skilled employees, using their expertise with explosives, blew away the rock covering the fossils and exposed a significant amount of the fossil-bearing layer so that excavation can begin again this year. Without their talents, scientifically important fossils would have remained locked underground in their stony mausoleum.

Fossil excavation often uses small tools, either pneumatic or manual, to carefully remove rock from delicate fossils. However, in some instances, instruments that are more powerful are needed. Although explosives might seem extreme, in the right setting and in the right hands, they are the right tool for the job --- staff at Dinosaur National Monument can certainly testify to that.

60 Percent Of Americans Live In Areas Where Air Is Dirty Enough To Endanger Lives


The 10th annual American Lung Association State of the Air report released April 29 finds that six out of ten Americans--186.1 million people -- live in areas where air pollution levels endanger lives.
State of the Air 2009 acknowledges substantial progress against air pollution in many areas of the country, but finds nearly every major city still burdened by air pollution. Despite America’s growing “green” movement, the air in many cities became dirtier. The State of the Air report includes a national air quality “report card” that assigns A-F grades to communities across the country. The report also ranks cities and counties most affected by the three most widespread types of pollution (ozone—or smog, annual particle pollution, and 24-hour particle pollution levels) and details trends for 900 counties over the past decade.

“This should be a wake-up call. We know that air pollution is a major threat to human health,” said Stephen J. Nolan, American Lung Association National Board Chair. “When 60 percent of Americans are left breathing air dirty enough to send people to the emergency room, to shape how kids’ lungs develop, and to kill, air pollution remains a serious problem.”

The report finds that air pollution hovers at unhealthy levels in almost every major city, threatening people’s ability to breathe and placing lives at risk. Some of the biggest sources of air pollution, including dirty power plants, dirty diesel engines and ocean-going vessels, also worsen global warming.

“The more we learn, the more urgent it becomes for us to take decisive action to make our air healthier,” added Nolan.

Many cities, like Los Angeles, New York, Atlanta, Charlotte, Philadelphia, Washington, D.C., and Baltimore have made considerable improvements in their air quality over the past decade. People living in some of these cities however, are breathing even dirtier air than what was reported in the Lung Association’s 2008 report. Only one city—Fargo, N.D.—ranked among the cleanest in all three air pollution categories covered in State of the Air.

Ozone

Sixteen cities making this year’s 25 most ozone-polluted list experienced worsened ozone (smog) problems than last year’s report found. Fifty-eight percent of people in the United States live in counties with recorded unhealthy levels of ozone air pollution, measured against the tighter standard in effect since March 2008. The new standard showed that unhealthy ozone levels are more widespread and more severe than previously recognized.

The report’s review of the past 10 years identified consistent improvements in ozone in some cities, most notably Los Angeles, which has long been recognized for its serious ozone problem. By contrast, two cities, Dallas-Ft. Worth and Las Vegas, have higher ozone levels than 10 years ago. The report reviewed all previous data against the new EPA standard to appropriately trace the trends.

Ozone is the most widespread form of air pollution. When inhaled, ozone irritates the lungs, resulting in something like a bad sunburn. The health effects of breathing ozone pollution can be immediate. Ozone can cause wheezing, coughing and asthma attacks. Breathing ozone pollution can even shorten lives.

“More than 175 million Americans live in areas with unhealthy smog levels—that’s 80 million more than we identified in last year’s report,” explained Charles D. Connor, American Lung Association President and CEO. “We at the American Lung Association believe that the new ozone standard is not yet strong enough to protect human health—an opinion nearly all scientific experts share.”

Particle Pollution

State of the Air grades counties for both 24-hour and year-round particle pollution levels. Particle pollution is a toxic mix of microscopic soot, diesel exhaust, chemicals, metals and aerosols. It is the most dangerous and deadly of the outdoor air pollutants that are widespread in America. Breathing in particle pollution can increase the risk of early death, heart attacks, strokes and emergency room visits for asthma and cardiovascular disease.

One in six people in the United States lives in an area with unhealthy year-round levels of fine particle pollution (termed annual average levels). Nine cities in the list of the 25 most polluted by year-round particle pollution showed measurable improvement, including five cities that reported their best year-round levels since the Lung Association began tracking this pollutant: Pittsburgh, Cincinnati, Atlanta, York, Pa., and Lancaster, Pa. The annual average level of particle pollution worsened in a dozen cities, including Bakersfield, Calif., Los Angeles and Houston.

Roughly 3 in 10 Americans live in counties with unhealthful spikes of particle pollution which can last from hours to days (termed 24-hour levels). Thirteen cities had more days—or more severe days—of spikes than in last year’s report. Eleven cities have improved continually since the 2007 report.

Emerging research has redefined the severity and immediate health impacts of particle pollution and ozone, as well as an expanded definition of specific groups at great risk. New data show that women in their 50’s may be particularly threatened by air pollution and that diesel truck drivers and dockworkers who are forced to breathe exhaust on the job may face a greater risk of developing lung cancer or chronic obstructive pulmonary disease. California researchers have tripled their estimate of the number of people that particle pollution kills each year in their state.

“The science is rock-solid. We now know that air pollution can impair the lung function of even the healthiest people,” said Norman H. Edelman, MD, American Lung Association Chief Medical Officer. “Air pollution worsens asthma and is a direct cause of heart attacks, which makes people living with lung and heart disease especially vulnerable.”

Low income people and some racial and ethnic groups often face greater risk from pollutants. Pollution sources like factories and power plants may be closer to their homes. Many live near areas with heavy highway traffic or have poor access to health care, which makes them even more vulnerable. Some racial and ethnic groups have a higher prevalence of diseases like asthma or diabetes, which compounds the ill effects of air pollution for these groups.

“We need to renew our commitment to providing healthy air for all our citizens—a commitment the United States made almost 40 years ago when Congress passed the Clean Air Act,” Connor said. “After four decades, we still have much work to do. America needs to cut emissions from big polluters like coal-fired power plants and ocean-going vessels. We need to fix old dirty diesel engines to make them cleaner and strengthen the ozone standards to better protect our health. We also need to improve the decaying infrastructure of air monitors. America must now enforce the laws that help us improve our nation’s air quality.”

As America faces the challenges of air pollution, global warming and energy, the American Lung Association urges Congress, the EPA and individuals to choose solutions that help solve all three challenges together. Some steps that sound like good solutions for one problem can make air pollution worse.

Americans can make personal changes to improve air quality immediately and ultimately impact climate change as well: drive less; don’t burn wood or trash; use less electricity; and make sure local school systems require clean school buses.

Cleanest Cities In USA

Cleanest U.S. Cities for Short-term Particle Pollution (24 Hour PM2.5)

*Cities below had equal scores.

* Alexandria, La.
* Amarillo, Texas
* Austin-Round Rock, Texas
* Bismarck, N.D.
* Brownsville-Harlingen-Raymondville, Texas
* Cheyenne, Wyo.
* Colorado Springs, Colo.
* Corpus Christi-Kingsville, Texas
* Fargo-Wahpeton, N.D.-Minn.
* Farmington, N.M.
* Fort Collins-Loveland, Colo.
* Grand Junction, Colo.
* Longview-Marshall, Texas
* Midland-Odessa, Texas
* Oklahoma City-Shawnee, Okla.
* Portland-Lewiston-South Portland, Maine
* Pueblo, Colo.
* Redding, Calif.
* Salinas, Calif.
* San Luis Obispo-Paso Robles, Calif.
* Santa Barbara-Santa Maria-Goleta, Calif.
* Santa Fe-Espanola, N.M.
* Sioux Falls, S.D.
* Tucson, Ariz.

10 Cleanest U.S. Cities for Long-term Particle Pollution (Annual PM2.5)

*Cities listed in rank order. Duplicate position numbers indicate ties.

1. Cheyenne, Wyo.

2. Santa Fe-Espanola, N.M.

3. Honolulu, Hawaii

4. Great Falls, Mont.

5. Flagstaff, Ariz.

6. Farmington, N.M.

7. Anchorage, Alaska

8. Tucson, Ariz.

9. Bismarck, N.D.

9. Salinas, Calif.

Cleanest U.S. Cities for Ozone Air Pollution

*Cities below had equal scores.

* Billings, Mont.
* Carson City, Nev.
* Coeur D’Alene, Idaho
* Fargo-Wahpeton, N.D.-Minn.
* Honolulu, Hawaii
* Laredo, Texas
* Lincoln, Neb.
* Port St. Lucie-Sebastian-Vero Beach, Fla.
* Sioux Falls, S.D.

Most Polluted Cities in USA

10 U.S. Cities Most Polluted by Short-term Particle Pollution (24 Hour PM2.5)

*Cities listed in rank order. Duplicate position numbers indicate ties.

1. Pittsburgh-New Castle, Pa.

2. Fresno-Madera, Calif.

3. Bakersfield, Calif.

4. Los Angeles-Long Beach-Riverside, Calif.

5. Birmingham-Hoover-Cullman, Ala.

6. Salt Lake City-Ogden-Clearfield, Utah

7. Sacramento-Arden-Arcade-Yuba City, Calif.-Nev.

8. Logan, Utah

9. Chicago-Naperville-Michigan City, Ill.-Ind.-Wis.

9. Detroit-Warren-Flint, Mich.

U.S. Cities Most Polluted by Year-Round Particle Pollution (Annual PM2.5)

*Cities listed in rank order.

1. Bakersfield, Calif.

2. Pittsburgh-New Castle, Pa.

3. Los Angeles-Long Beach-Riverside, Calif.

4. Visalia-Porterville, Calif.

5. Birmingham-Hoover-Cullman, Ala.

6. Hanford-Corcoran, Calif.

7. Fresno-Madera, Calif.

8. Cincinnati-Middletown-Wilmington, Ohio-Ky.-Ind.

9. Detroit-Warren-Flint, Mich.

10. Cleveland-Akron-Elyria, Ohio

U.S. Cities Most Polluted by Ozone

*Cities listed in rank order.

1. Los Angeles-Long Beach-Riverside, Calif.

2. Bakersfield, Calif.

3. Visalia-Porterville, Calif.

4. Fresno-Madera, Calif.

5. Houston-Baytown-Huntsville, Texas

6. Sacramento-Arden-Arcade-Yuba City, Calif.-Nev.

7. Dallas-Fort Worth, Texas

8. Charlotte-Gastonia-Salisbury, N.C.-S.C.

9. Phoenix-Mesa-Scottsdale, Ariz.

10. El Centro, Calif.

The full State of the Air report can be found at http://www.stateoftheair.org.

Scientists Discover 'Dancing' Algae


Freshwater algae called Volvox can form stable groupings in which they dance around each other, researchers have found. (Credit: Ray Goldstein / Cambridge University)

Scientists at the Cambridge University have discovered that freshwater algae can form stable groupings in which they dance around each other, miraculously held together only by the fluid flows they create.

The researchers studied the multicellular organism Volvox, which consists of approximately 1,000 cells arranged on the surface of a spherical matrix about half a millimetre in diameter. Each of the surface cells has two hair-like appendages known as flagella, whose beating propels the colony through the fluid and simultaneously makes them spin about an axis.

The researchers found that colonies swimming near a surface can form two types of "bound states"; the "waltz", in which the two colonies orbit around each other like a planet circling the sun, and the "minuet", in which the colonies oscillate back and forth as if held by an elastic band between them.

The researchers have developed a mathematical analysis that shows these dancing patterns arise from the manner in which nearby surfaces modify the fluid flow near the colonies and induce an attraction between them. The observations constitute the first direct visualisations of the flows, which have been predicted to produce such an attraction. They have been implicated previously in the accumulation of swimming microorganisms such as bacteria and sperm cells near surfaces.

These findings also have implications for clustering of colonies at the air-water interface, where these recirculating flows can enhance the probability of fertilization during the sexual phase of their life cycle.

Professor Raymond E. Goldstein, the Schlumberger Professor of Complex Physical Systems in the Department of Applied Mathematics and Theoretical Physics (DAMTP) and lead author of the study, said: "These striking and unexpected results remind us not only of the grace and beauty of life, but also that remarkable phenomena can emerge from very simple ingredients."

Funded by the Biotechnology and Biological Sciences Research Council (BBSRC), the work is part of a larger effort to improve our knowledge of evolutionary transitions from single-cell organisms to multicellular ones. This greater understanding of the nature of self-propulsion and collective behaviour of these organisms promises to elucidate key evolutionary steps toward greater biological complexity.

Moreover, the flagella of Volvox are nearly identical to the cilia in the human body, whose coordinated action is central to many processes in embryonic development, reproduction, and the respiratory system. For this reason, the study of flagellar organisation has potentially broad implications for human health and disease.

The group was led by Professor Goldstein and included Ph.D. student Knut Drescher, postdoctoral researchers Drs. Idan Tuval and Kyriacos C. Leptos, Professor Timothy J. Pedley of DAMTP, and Prof. Takuji Ishikawa of Tohoku University, Japan.

Milky Way's X-ray Ridge: Resolving A Galactic Mystery


This extremely deep Chandra X-ray Observatory image has resolved a long-standing mystery about an X-ray glow along the plane of the Milky Way. The Chandra results show that the X-ray emission in the region is caused by hundreds of point-like sources, implying that the glow along the plane of the Galaxy is due to millions of such sources. In this image, the Chandra field-of-view, a region located only about 1.4 degrees from the Galactic Center, is pulled out from an infrared image from the Spitzer Space Telescope. (Credit: X-ray: NASA/CXC/TUM/M.Revnivtsev et al.; IR: NASA/JPL-Caltech/GLIMPSE Team)

An extremely deep Chandra X–ray Observatory image of a region near the center of the Milky Way Galaxy has resolved a long-standing mystery about an X-ray glow along the plane of the our home galaxy. The glow in the region covered by the Chandra image was discovered to be caused by hundreds of point-like X-ray sources, implying that the glow along the plane of the Galaxy is due to millions of such sources.
This image shows an infrared view from the Spitzer Space Telescope of the central region of the Milky Way, with a pullout showing a Chandra image of a region located only 1.4 degrees away from the center of the Galaxy.

The so-called Galactic ridge X-ray emission was first detected more than two decades ago using early X-ray observatories such as HEAO-1 and Exosat. The ridge was observed to extend about two degrees above and below the plane of the Galaxy and about 40 degrees along the plane of the galaxy on either side of the galactic center. It appeared to be diffuse.

One interpretation of the Galactic X-ray ridge was that it is emission from 100-million-degree gas. This interpretation is problematic because the disk of the Galaxy is not massive enough to confine such hot gas, which should flow away in a wind. Replenishing the gas would then be a problem, since plausible sources of energy such as supernovas are not nearly powerful enough.

A very deep Chandra observation, lasting for about 12 days, was used to study the nature of this ridge emission. The field was chosen to be close enough to the Galactic plane so that the ridge emission was strong, but in a region with relatively little absorption from dust and gas to maximize the number of sources that might be detected. A total of 473 sources were detected in an area on the sky only about 3% of the size of the full Moon, one of the highest densities of X-ray sources ever seen in our Galaxy.

It was found that more than 80% of the seemingly diffuse ridge of X-ray emission was resolved into individual sources. These are believed to be mostly white dwarfs pulling matter from companion stars and double stars with strong magnetic activity that are producing X-ray outbursts or flares that are similar to, but more powerful than the flares seen on the Sun. These stars are unrelated to the large-scale structures seen towards the center of the Spitzer image, which are probably caused by young massive stars.

The paper reporting these results appears in the April 30th issue of Nature. This work was led by Mikhail Revnivtsev from the Excellence Cluster Universe, Technical University Munich, in Garching, Germany, and from the Space Research Institute, in Moscow, Russia. The co-authors were Sergey Sasanov of the Space Research Institute in Moscow, Russia; Eugene Churazov of the Max Planck Institute for Astrophysics (MPA) in Garching, Germany; William Forman and Alexey Vikhlinin from the Harvard-Smithsonian Center for Astrophysics and Rashid Sunyaev from MPA.

"Hidden" Planet Found in Old Hubble Image


A new technique stripped away starlight in a 1998 Hubble Space Telescope image (inset) to reveal the earliest known picture of a planet orbiting the distant star HR 8799, astronomers announced in April 2009.

The gas giant planet, seen above in an artist's conception, is slightly larger than Jupiter. Scientists aren't sure whether the exoplanet has rings, but they know such features are common around similar planets in our solar system.

Illustration courtesy NASA, ESA, and G. Bacon (STScI); Hubble picture courtesy NASA, ESA, and D. Lafrenire (University of Toronto, Canada)


It took 11 years, but scientists have now found the earliest known picture of a planet outside our solar system.

Using a new technique that removes starlight from an image, scientists re-examined a Hubble Space Telescope picture taken in 1998 and stripped away starlight to reveal a "hidden" world.
This planet orbits the young star HR 8799, which lies about 130 light-years away in the constellation Pegasus, noted lead study author David Lafrenière of the University of Toronto.

Last September Lafrenière and colleagues announced the first direct picture of an alien planetary system: three massive worlds circling HR 8799. The archived Hubble picture shows the outermost of that planetary trio.

Although the new find is technically confirmation of a previously known planet, the discovery suggests there could be many more unknown planets waiting to be found in Hubble's archives, researchers say.

"They've dug up old Hubble images and found a planet! Crazy!" Geoff Marcy, an astronomer at the University of California, Berkeley, commented by email.

"This will spawn a wild race by astronomers everywhere in the world to dig out their old Hubble images to hunt for planets lost in the rubble of the Hubble."

Stripping Starlight

So far, only a handful of extrasolar planets, or exoplanets, have had their pictures taken directly. Most of the more than 300 known exoplanets have been found based on indirect proof of their existence.

Some are Jupiter-size worlds so massive that their gravity causes light from their parent stars to "wobble."

In other cases, a star's gravitational field magnifies background light like a giant lens. The presence of an orbiting planet periodically adds a tiny amount to this magnification effect.

Still other planets pass in front of their stars as seen from Earth, causing the starlight to dim for a moment. It wasn't until 2004 that astronomers released the first direct picture of an exoplanet, and that one was relatively easy to spot because it was circling a dim failed star known as a brown dwarf.

Study author Lafrenière was inspired to go on his retroactive planet hunt when he heard that scientists had taken the 1998 Hubble picture specifically to look for possible planets around HR 8799, but at the time had come up empty.

"You start with a set of several images of different stars obtained with the same instruments at the same wavelength," he said of the new starlight-removal method.

A computer program then combines the images to create a mock star that resembles the light from the real target star.

Subtracting that light from an image of the target star leaves behind any bright planetary dots that might be in orbit.

Orbital Dance

Astronomer Paul Kalas, also at UC Berkeley, found the first visible-light picture of an exoplanet in a 2005 Hubble image of the dusty disk around the star Fomalhaut.

Astronomers had suspected since the 1980s that a planet might exist there, but they needed more observations to confirm the find, which was announced in 2008.

"Proving that an object is a planet and not a faint background star requires evidence that the object moves along with the star in space," Kalas said.

"With archival [Hubble] data, we would be able to find planet candidates, but confirmation requires observations at later dates, after the star has moved a bit relative to the field of distant background stars."

Overall, Kalas said, a successful planet-finding program might combine archived telescope pictures with new data from ground-based observatories.

Planet's Character

Improving techniques for direct imaging can offer more than just finding new planets, study author Lafrenière added.

Once astronomers can confirm that a given planet exists, pictures can tell us more about a planet's size, its chemical makeup, and its likely atmospheric and surface temperatures, he said.

Hubble's shot of the planet orbiting HR 8799, for example, supports theories that its atmosphere contains significant amounts of water vapor and is partially covered with dust clouds.

Also, most indirect planet-spotting techniques, such as the wobble method, aren't well equipped to find planets farther from their stars than Jupiter is from the sun, Lafrenière noted.

That's because they rely on a planet's gravitational influence on its host, an interaction that gets harder to detect farther away from the star.

But based on our own solar system, scientists know planets could exist in very distant orbits.

"So direct imaging is crucial," Lafrenière said, "to complete a census of the diversity of planetary systems that exist out there.

Robot Animals Snare U.S. Poachers


Around the U.S., sting operations using robot decoys (above, a robotic white-tailed deer with moving head and tail) to nab poachers are saving animals from being illegally killed or captured for the pet trade, government officials say.

On a remote U.S. Forest Service road earlier this year, the driver of a white minivan slowly rolls to a stop, sticks a rifle out the window, and starts firing at what look to be wild turkeys.

State officers hiding in nearby bushes emerge, running toward the vehicle and shouting: "Game and Fish Department! Cease fire! Put down your weapon!"

The driver speeds off, but is caught a short distance down the dirt road by another officer. The hunter is cited for discharging a weapon from a vehicle—a U.S. $500 fine.

Unbeknownst to the driver, the turkey is actually a robotic decoy designed to catch such outdoor outlaws. Other robots include swimming moose, white-tailed deer and black bear.

Conservationists estimate that, for every animal killed legally in a hunting season, one animal is lost to poaching.

But year-round sting operations—like the one conducted near Young, Arizona, in 2009 and in nearly every other U.S. state—are helping to level the playing field by saving wildlife from being illegally killed or captured for the pet trade.

"I consider it like a bait car that police departments use to apprehend people who are stealing vehicles," explains Arizona Game and Fish Department officer Ken Dinquel.

For nearly 20 years, the Oregon State Police Department's Fish and Wildlife Division has run a decoy operation targeting violators who hunt off-season from their cars and roadways or at night with the aid of a spotlight.

Under state law, firing at a wildlife enforcement decoy is considered the same as firing at a live animal. All the same penalties apply.

"The people that shoot at decoys are wildlife thieves," said Lt. Steve Lane. "They're not hunters."

Robot Animals

These animals look and act just like the real things.

Molded-fiberglass animals are wrapped in genuine hides obtained by government officers through donations or illegal kills. nside the bodies are radio-controlled motors—the same type found in toy cars or planes—allowing wildlife officers to remotely move a decoy's head, ears, and tail. Special reflective eyes glow at night when light is shined on them.

The robots don't come cheap: Prices range from $500 for turkey to $5,500 for a grizzly bear.

But Bob Koons, executive director of the Humane Society of the United States's Wildlife Land Trust, feels the price is well worth it.

That's because decoys put law enforcement officers and poachers in the same spot at the same time, leading to more convictions.

Koons, whose trust donates the high-tech decoys to law enforcement agencies nationwide, said the program has "been extremely successful."

Illegal Immigrants

In Arizona, wildlife officers are stepping up efforts against the rising number of illegal immigrants hunting at night for meat to feed their families, and, in some cases, entire neighborhoods.

Dinquel, a 20-year veteran with the game-and-fish department, said poaching cases—which include illegal collection of protected species of reptiles for the pet trade—are a huge problem statewide.

The department runs about 12 decoy operations annually, he said, nabbing violators about 80 percent of the time. But not everyone who is caught knows they've done something wrong.

"Oftentimes there's just some disconnect with people on the wildlife laws," Dinquel said.

"They know that buying drugs on the streets of Phoenix is illegal, but they don't view shooting a deer as that big of a deal."

Birds can dance




Snowball the dancing parrot shifts rhythm as music changes.

And so far, they're the only known animals to display such rhythm.

Cats, dogs, and lab monkeys spend lots of time around human music. But no animal had ever been confirmed as moving to a beat—leading to the common belief that animals ain't got rhythm.

For one of two new studies on animal dancing, Aniruddh Patel at the Neurosciences Institute in San Diego and colleagues worked with Snowball the parrot, which seems to love "dancing" to the likes of Queen and Backstreet Boys.

To test whether the sulphur-crested cockatoo was really keeping a beat, the scientists would change the music's tempo—represented in these videos as "BPM" (beats per minute).

Not one to miss a beat, Snowball quickly picked up the new rhythms, stomping and head-bobbing in time.

"We were surprised by the degree Snowball could adjust his tempo," Patel said.

Only "Talking" Birds Can Dance?

The team theorized that dancing in rhythm relies on brain systems for vocal learning, found in humans and many parrots—an idea put to the test by the other study, led by Adena Schachner at Harvard University.

Schachner's team reviewed thousands of YouTube videos showing bird species that imitate sounds "dancing" to music. YouTube videos excerpted above helped confirm unique ability of vocal-learning birds.

"Across the hundreds of species in the database, we only found evidence of keeping a beat in species that could imitate sound," Schachner said.

Aqua Boogie?

The finding is a bit surprising, since wild parrots are not known to dance to other birds' songs, Schachner said.

No other wild animals are known to dance in time with music, either, for that matter. But the Neurosciences Institute's Patel noted that other animals are vocal learners, including a few that aren't born with dancing feet—or any feet at all.

"I'm now particularly interested in finding out if dolphins can move to the beat of music, as they, like humans, and unlike all other primates, are vocal-learning mammals."

http://www.youtube.com/watch?v=-6JSDxgHOJw&feature=player_embedded

The Mystery of Everett Ruess: SOLVED


For 75 years the disappearance of Everett Ruess has posed one of the greatest mysteries in the annals of adventure. Now, a skeleton in the desert, a navajo tale of murder, and a battery of genetic and forensic analyses may finally put the legend to rest.
Text by David Roberts
Photographs: Everett Ruess, in a previously unpublished 1933 portait by Dorothea Lange. Utah's Comb Ridge; Denny Bellson and Daisy Johnson; archaeologist Ron Maldonado by Dawn Kish (3).


Editor's Note: The DNA results are now in and confirm that the skeleton is Everett Ruess.

DNA results identify the body of 20-year-old Everett Ruess

NEW YORK—In a joint announcement today with National Geographic ADVENTURE magazine, researchers from the University of Colorado at Boulder released the results of a DNA test that positively identifies the remains of famed explorer and artist Everett Ruess, who disappeared in 1934, solving a mystery that has baffled law enforcement for more than 75 years.

Dr. Kenneth Krauter, professor of molecular, cellular, and developmental biology at the University of Colorado at Boulder, presented test results that compared the DNA of a femur found in the Utah desert to saliva samples taken from four of Ruess's nieces and nephews, the closest living relatives. The test examined the inheritance of some 600,000 markers using gene chips from the Affymetrix Corporation and found that the saliva samples and the DNA extracted from the femur share approximately 25 percent of those markers by inheritance. Nieces and nephews are expected to hold about one-quarter of their genetic markers in common with an aunt or uncle. The test provides essentially irrefutable evidence of a close blood relationship between the Ruess family DNA and the bone DNA. Subsequent tests comparing the bone DNA with 50 unrelated people confirmed the results, with considerably less than 1 percent of markers shared in this way.

"This was a textbook case," said Krauter. "We had a large number of markers and, when comparing the bone DNA and the Ruess samples, the mode of inheritance of those markers was exactly what you'd expect for the relationship between an uncle and a niece or nephew."

The DNA confirmation is the capstone of a yearlong investigation by National Geographic ADVENTURE magazine and its contributing editor David Roberts. Ruess, a writer, artist, and icon of the American Southwest, was last seen near Davis Gulch in Utah in 1934. Since his disappearance, at age 20, scores of searchers have canvassed the area, and his legend has grown to rival that of other lost American explorers, such as Amelia Earhart. In 1942 author Wallace Stegner took measure of Ruess, comparing him to a young John Muir, and in 1996 Jon Krakauer devoted 10 pages of Into the Wild to Ruess. The complete story of Ruess, his disappearance and the discovery of his gravesite appears in the April/May 2009 issue of National Geographic ADVENTURE, currently on newsstands.

The key to breaking the case came from an unlikely source: Denny Bellson, a traditional Navajo, who was unaware of the Ruess mystery prior to helping to solve it. In May 2008 Bellson's sister, Daisy Johnson, relayed a story her grandfather had told her of a young Anglo who was murdered in the Utah desert. Bellson found the site soon after.

The grave was excavated by Ron Maldonado, the Navajo Nation's supervisory archaeologist, and—with permission from the family—the remains were handed off to forensic anthropologists at the University of Colorado at Boulder. The anthropologists, Dr. Dennis Van Gerven, professor of anthropology at the University of Colorado at Boulder, and his graduate student assistant, Paul Sandberg, used fragments of skeleton to create a biological profile of the victim.

"The shape of the pelvis told us that the individual was male," Sandberg reports in the April/May issue of National Geographic ADVENTURE. "The degree of developmental maturity of the bones told us that he was between the ages of 19 and 22."

The anthropologists stabilized the fragile bone pieces, which were sun-bleached and eroded after decades of exposure, and painstakingly rebuilt a portion of the skull. They then superimposed an image of the remade skull on photographs of Everett Ruess taken in 1933, shortly before his disappearance. "The bones match the photo in every last detail," Van Gerven said after finishing the analysis. "Even down to the spacing between his teeth."

The results of the DNA test not only confirm the forensic work of Van Gerven and Sandberg but validate Navajo oral tradition. "If this were going before a court of law, you'd want to build a case," said Van Gerven. "That’s what we've done here, with Navajo oral tradition, the forensic analysis and now the DNA test. We can be certain that this is Ruess."

The investigative team also included Matt McQueen, assistant professor, Institute of Behavioral Genetics, University of Colorado at Boulder; and Helen Marshall, research assistant, molecular, cellular and developmental biology, University of Colorado at Boulder.


It was a chilly day in November 1934. The country had been mired in the Great Depression for more than five years, and no town felt the pinch of poverty more acutely than Escalante. Founded by Mormon pioneers 59 years earlier, the small settlement in southern Utah—then one of the most remote towns in the United States—had been stricken in successive summers by a plague of grasshoppers that ruined the crops and by the worst drought in nearly eight decades. In late autumn, the arrival of any visitor in Escalante was a rare occurrence. It was all the more surprising, then, when the thin, sandy-haired stranger rode into town from the west, saddled on one undersized burro, leading another that was packed with camping gear. His name, he told the locals, was Everett Ruess. He was from California. And although he was only 20, he had been wandering all over the Southwest for the better part of the previous four years.

The young boys of Escalante took an instant liking to the vagabond. During the next several days, they rode horseback with him along the nearby ridges, hunted for arrowheads, and shared his campfire dinner of venison and potatoes. On his last night in town, Ruess (pronounced roo-ess) treated a couple of the boys to the local movie theater. They watched Death Takes a Holiday.

Then Ruess rode alone out of town, headed southeast down the Hole in the Rock Trail toward the barren plateau the locals called the Desert. The day before, he had mailed a last letter to his brother in California. "It may be a month or two before I have a post office," he wrote, "for I am exploring southward to the Colorado [River], where no one lives."

Ruess was launched on the next leg of his quest for beauty and adventure. A week later, 50 miles out, he sat around a campfire with a couple of Escalante sheepherders.

And then, Everett Ruess disappeared from the face of the Earth.



It was a warm day in May 2008. Daisy Johnson had come from her home in Farmington, New Mexico, to Shiprock to visit her younger brother, Denny Bellson. And to tell him a story he had never heard before—a story about their grandfather, Aneth Nez, that took place back in the 1930s.

Fifty-six years old last May, Johnson was a troubled woman. A year before, she had been diagnosed with ovarian cancer. She underwent a round of chemotherapy that nauseated her and caused her hair to fall out, but the cancer had gone away. Now, just in the past few weeks, it had come back. This time Johnson, a traditional Navajo, went to a medicine man.

"He told me this all came about because of our grandpa," Johnson said to her brother. She knew in a heartbeat that the medicine man must be right. How else had he known about her grandfather?

Bellson lives on the Navajo Reservation, just off U.S. Highway 191, not far from where he and his sister had grown up, and where their grandfather, Aneth Nez, had lived. Last May he listened to his sister’s story in electrified silence.

"A long time ago," she said, "Grandpa was sitting up there on the rim of Comb Ridge [a sandstone uplift that crosses the Utah-Arizona border]. For several days he watched this guy—he was a real young Anglo dude—riding up and down the canyon below him. The guy had two mules, one that he rode and one that was packed with things dangling off the side. It was like he was looking for something."

One day, according to Johnson, Nez saw the young man down in the riverbed, only this time he was yelling and riding fast. Nez scanned the wash below and saw three Utes chasing the boy. "They caught up with him and hit him on the head and knocked him off his mule," she recounted. "They left him there and took off with the mules and whatever else the guy had."

As he watched the scene unfold, Nez stayed out of view. For centuries Utes living north of the San Juan River had been fierce enemies of the Navajo, whose homeland lay south of the river. As late as the 1930s, tensions between the groups occasionally broke out in violence. Nez’s perch was only a few miles from that ethnic frontier.

When the Utes had gone, Nez descended some 300 feet from Comb Ridge to the bed of Chinle Wash. The young man was dead by the time Nez got to him. Rather than looking for a burial site in the open wash, the Navajo hauled the body up to the rocky folds of the ridge, in all likelihood on the back of his horse. "Grandpa got a lot of blood on him," Johnson said. "That’s what made him get sick later. Then he buried the young guy up there on the rim."

For more than three decades, Aneth Nez had told no one about this dark episode in his past. Then, in 1971, at the age of 72, he also had fallen ill with cancer. Nez paid a medicine man to diagnose his trouble. "He said," Daisy Johnson recalled, "‘You had no business messing around with that body.’"

The medicine man told Nez that the only way he could cure his cancer would be to retrieve a lock of hair from the head of the young man he had buried decades earlier, then use it in a five-day curing ceremony. "I was 19," Johnson said. "I was home for the summer. That was the first time I ever heard anything about the young dude the Utes had killed down there in Chinle Wash."

Johnson drove Nez out toward the Comb in a pickup. She waited in the cab for two hours, guessing that her grandfather was reconnoitering the land or perhaps even praying to prepare himself. He returned to the pickup empty-handed.

Later, Nez traveled back to the Comb with a medicine man. This time he retrieved a lock of hair from the grave. In the curing ceremony, Johnson said, the medicine man dusted the hair with ashes—"so it will never bother the patient again." At the end of the five days, the medicine man shot the lock with a gun, to destroy it completely.

"And then Grandpa got better," Daisy Johnson said. "He lived another ten years."
As he listened to her story, Bellson realized that the grave must lie not far from the house he had built in 1993. Thirteen years younger than his sister, Bellson has kept a close bond with the land on which he grew up. Now he was seized with a passion to find the grave where Nez had buried the "young dude" back in the 1930s.

Several weeks later, Bellson drove to Farmington to see his sister. He brought with him a USGS topo map. "I tried to get her to show me where she’d parked the pickup with our grandpa," Bellson told me later. "When I showed her the map, she recognized a Y in the road near Colored Rock Woman’s house. She gave me real good directions."



During the next few weeks, Bellson, a carpenter and craftsman, spent his free time out hiking Comb Ridge, looking into every corner and crack along the rim. Then, one day, in an obscure crevice just under the crest of the Comb, he found a grave. Bellson saw at once that the person whose bones lay in that unlikely tomb had been buried in haste, and perhaps in great fear. A traditional Navajo himself, Bellson did not touch a thing.

When he got home, he called Johnson. "I found the grave," he told her.

Supercomputer Time


The Department of Energy is releasing a record amount of supercomputing time, 1.3 billion processor hours, which has astrophysicists, biologists and everyone in between drooling in anticipation.

Starting in 2010, some of them will have the chance to run the biggest and most intricate simulations ever, creating experimental galaxies, plasma fusion reactors and global climates to help solve some of science’s most complex problems.

They’ll be competing for time on the Cray XT system “Jaguar” at Oak Ridge National Laboratory in Tennessee and the IBM Blue Gene/P “Intrepid” at Argonne National Laboratory in Illinois, two of the most powerful supercomputer facilities in the world. Unlike many of the DOE’s big machines, they’re dedicated to open, unclassified research.

“This is an incredible increase in computing power, which was itself a huge increase from the year before,” said DOE spokesman Jeff Sherwood. “It’s for research that would not be possible without petascale computing.”

In 2009, 900 million processor hours were up for grabs (a million processing hours would take 1,000 processors 1,000 hours, or around 41 days), but both computers received huge performance boosts this year. Jaguar’s processor count has shot up from 31,328 to 180,832, while Intrepid now boasts 163,840 from 32,768. Jaguar’s peak performance is now a blistering 1.64 petaflops (a quadrillion and a half floating point operations per second), making it the second most powerful supercomputer on Earth.

The only number cruncher with more power is IBM’s “Roadrunner” at Los Alamos National Laboratory in New Mexico, which runs simulations of nuclear weapons, and sits behind the rather impenetrable firewall of national security.

The boost will allow scientists to tackle traditionally cantankerous problems that involve multiple simultaneous physical phenomena. In enormous, high-resolution simulations, they can tweak an unprecedented multitude of conditions to test their theories.

“These are the only places in the world where you can do these types of simulations,” said Bronson Messer of ORNL, whose simulations of core-collapse supernovae were allocated 75 million processing hours in 2009, more than any other project. “In the case of stars and dark matter, there’s a lot of physics going on. They’re very attractive targets for a big machine like this.”Messer hopes to understand how stars more than 10 times the mass of our sun die. Such deaths are the dominant source of elements in the universe.

Giant stars live much shorter lives than sun-size stars — about 10 million years rather than 5 to 15 billion — and they do not die quietly. The iron core collapses from a couple thousand miles in diameter to about 35 miles in half a second, reaching a density equivalent to the mass of all humans on Earth packed into a sugar cube. The core then rebounds with a blast of neutrinos and a shock wave that rips the star apart.

As the saying goes, these supernovae “live fast, die young, and leave a beautiful corpse,” but astrophysicists don’t understand some of the basic mechanisms of how the alluring explosions take place.

“People have been trying to attack this on computers for 40 to 50 years,” Messer said. “We’re using simulations to basically pick a neutrino and ride along as it flies out of the star, and do this with as many neutrinos as possible. We’re finally starting to see some hints of what’s happening, and we’re pretty jazzed about it.”

The team has used Jaguar to simulate the supernova up to about 100 milliseconds after the shock wave begins, and they hope to reach half a second. “If we can use 180,000 processors, we’ll get much more accurate physics,” Messer said.

ch24flameAnother astrophysics project on Jaguar led by Piero Madau at the University of California, Santa Cruz will use 5 million processor-hours to explore the invisible halo of dark matter that surrounds the Milky Way.

Madau’s simulations, the largest ever performed for the Milky Way, will divide the halo into 30 billion parcels of dark matter and will simulate their evolution over 13 billion years. In an earlier simulation on Jaguar, he produced the most detailed picture of the Milky Way’s halo, showing that small clumps of dark matter from the early galaxy survived to present day.



“In fact, the entire galaxy is decidedly clumpy, including our own neighborhood,” he said. “Earlier simulations on less powerful systems had shown the dark matter smoothing out, especially in the galaxy’s dense inner reaches, because they did not have the resolution to resolve the unevenness.”

Astrophysics projects get the biggest allocation of Jaguar’s processing time — between 18 and 19 percent of the total. But other areas involving vast scales and multiple physical phenomena, like climate and combustion, also get sizable chunks of processing time.

Jackie Chen of Sandia National Laboratories is using 30 million processor-hours on Jaguar to simulate the combustion process of alternative fuels, like biofuel and ethanol. Her modeling of flames, ignition and turbulence can influence engine design, allowing for higher-efficiency and lower emissions vehicles.

“To understand the underlying physics of what’s going on in the internal combustion engines with alternative fuels,” said Chen, “we need some of the world’s largest calculations.”



Other ongoing projects seek to understand how proteins misfold in neurodegenerative diseases, develop thermoelectric materials to capture wasted heat from tailpipe emissions and create high-resolution climate models.

Mummified Puppy Found in Egyptian Tomb


A small bundle found at the feet of an ancient Egyptian mummy whose tomb was inscribed with the phrase "Hapi-Men" contained the remains of a young dog, according to University of Pennsylvania Museum of Archaeology and Anthropology staff that have named the canine "Hapi-Puppy."

The approximately 2,300-year-old puppy, revealed during a recent CT scan, is thought to be one of the world's rarest mummified animals. Early Egyptians often preserved cats, birds and even crocodiles, but not often dogs.

Jennifer Wegner, a senior research scientist in the museum's Egyptian section, explained to Discovery News that unlike some of the other more commonly mummified animals, the ancient Egyptians "had no dog gods, per se, although certain gods, like Anubis, could take the form of a jackal."

"In this case, we think Hapi-Men simply wanted to be buried with his beloved pet," she said, explaining that "Hapi-Men" translates roughly to, "The Apis bull endures," referring to the bull god Apis. Patients at the Hospital of the University of Pennsylvania must have been surprised when, just over a week ago, Hapi-Men, Hapi-Puppy were hauled into the hospital's CT scanning room. Computed tomography creates detailed three-dimensional images of objects by compiling multiple photographed "slices."

The researchers had no trouble sliding the mummies into the machine, but the mummies' length required two partial body scans with overlaps.

Janet Monge, acting curator of the museum's Physical Anthropology section, was delighted when the puppy images came through.

"You could see its Jack Russell terrier-type legs, long head and individual toes," she said. Wegner added that early Egyptians commonly depicted two general types of dogs: a greyhound-looking canine and one that looked more like a corgi. Another researcher, Samantha Cox, and other scientists plan to study Hapi-Puppy to more precisely identify it.



"The ancient Egyptians showed dogs being held on a leash, sitting under the chairs of owners, and they even sometimes listed their names, such as Brave One, Reliable, North Wind and even Useless," said Wegner. "Obviously people enjoyed close relationships with their dogs, and Hapi-Men must have been no exception."

Royals appeared to enjoy pets as well. Ruler Intef Wahankh II was immortalized in a stele with his three hunting dogs named Gazelle, Greyhound and Black. Images suggest Cleopatra may have preferred cats, which were also popular.

The scans showed Hapi-Men was 40-plus when he died, a relatively advanced age for his time. He was draped with numerous amulets, including a "wadjet eye" stuck in the middle of his forehead, heart-shaped objects, a scarab beetle, an Isis goddess figurine and objects in the shape of the four Sons of Horus, associated with renewal and healing.

The cause of Hapi-Puppy's demise remains unknown, but the dog's age suggests it was killed upon his master's death.

"We see this as a senseless slaughter today, but in ancient Egypt it would've been viewed very differently," Monge explained. "People then felt life on Earth was very short. Hapi-Men wanted to spend all of eternity with his dog."