Showing posts with label Health. Show all posts
Showing posts with label Health. Show all posts

Stinkbug Threat Has Farmers Worried


Part of our weekly "In Focus" series—stepping back, looking closer.

Maryland farmer Nathan Milburn recalls his first encounter.

It was before dawn one morning in summer 2010, and he was at a gas station near his farm, fueling up for the day. Glancing at the light above the pump, something caught his eye.

"Thousands of something," Milburn remembers.

Though he'd never actually seen a brown marmorated stinkbug, Milburn knew exactly what he was looking at. He'd heard the stories.

This was a swarm of them—the invasive bugs from Asia that had been devouring local crops.

"My heart sank to my stomach," Milburn says.

Nearly three years later, the Asian stinkbug, commonly called the brown marmorated stinkbug, has become a serious threat to many mid-Atlantic farmers' livelihoods.

The bugs have also become a nuisance to many Americans who simply have warm homes—favored retreats of the bugs during cold months, when they go into a dormant state known as overwintering.

The worst summer for the bugs so far in the U.S. was 2010, but 2013 could be shaping up to be another bad year. Scientists estimate that 60 percent more stinkbugs are hunkered down indoors and in the natural landscape now than they were at this time last year in the mid-Atlantic region.

Once temperatures begin to rise, they'll head outside in search of mates and food. This is what farmers are dreading, as the Asian stinkbug is notorious for gorging on more than a half dozen North American crops, from peaches to peppers.

Intruder Alert

The first stinkbugs probably arrived in the U.S. by hitching a ride with a shipment of imported products from Asia in the late 1990s. Not long after that, they were spotted in Allentown, Pennsylvania. Since then, they've been identified in 39 other states. Effective monitoring tools are being developed to help researchers detect regional patterns.

There are two main reasons to fear this invader, whose popular name comes from the pungent odor it releases when squashed. It can be distinguished from the native stinkbug by white stripes on its antennae and a mottled appearance on its abdomen. (The native stinkbug can also cause damage but its population number is too low for it to have a significant impact.)

For one thing, Asian stinkbugs have an insatiable appetite for fruits and vegetables, latching onto them with a needlelike probe before breaking down their flesh and sucking out juice until all that's left is a mangled mess.

Peaches, apples, peppers, soybeans, tomatoes, and grapes are among their favorite crops, said Tracy Leskey, a research entomologist leading a USDA-funded team dedicated to stinkbug management. She adds that in 2010, the insects caused $37 million in damage just to apple crops in the mid-Atlantic region.

Another fear factor: Although the stinkbug has some natural predators in the U.S., those predators can't keep up with the size of the stinkbug population, giving it the almost completely unchecked freedom to eat, reproduce, and flourish.

Almost completely unchecked. Leskey and her team have found that stinkbugs are attracted to blue, black, and white light, and to certain pheromones. Pheromone lures have been used with some success in stinkbug traps, but the method hasn't yet been evaluated for catching the bugs in large numbers.

So Milburn—who is on the stakeholders' advisory panel of Leskey's USDA-funded team—and other farmers have had to resort to using some chemical agents to protect against stinkbug sabotage.

It's a solution that Milburn isn't happy about. "We have to be careful—this is people's food. My family eats our apples, too," he says. "We have to engage and defeat with an environmentally safe and economically feasible solution."

Damage Control

Research Entomologist Kim Hoelmer agrees but knows that foregoing pesticides in the face of the stinkbug threat is easier said than done.

Hoelmer works on the USDA stinkbug management team's biological control program. For the past eight years, he's been monitoring the spread of the brown marmorated stinkbug with an eye toward containing it.

"We first looked to see if native natural enemies were going to provide sufficient levels of control," he says. "Once we decided that wasn't going to happen, we began to evaluate Asian natural enemies to help out."

Enter Trissolcus, a tiny, parasitic wasp from Asia that thrives on destroying brown marmorated stinkbugs and in its natural habitat has kept them from becoming the extreme pests they are in the U.S.

When a female wasp happens upon a cluster of stinkbug eggs, she will lay her own eggs inside them. As the larval wasp develops, it feeds on its host—the stinkbug egg—until there's nothing left. Most insects have natural enemies that prey upon or parasitize them in this way, said Hoelmer, calling it "part of the balance of nature."

In a quarantine lab in Newark, Delaware, Hoelmer has been evaluating the pros and cons of allowing Trissolcus out into the open in the U.S. It's certainly a cost-effective approach.

"Once introduced, the wasps will spread and reproduce all by themselves without the need to continually reintroduce them," he says.

And these wasps will not hurt humans. "Entomologists already know from extensive research worldwide that Trissolcus wasps only attack and develop in stinkbug eggs," Hoelmer says. "There is no possibility of them biting or stinging animals or humans or feeding on plants or otherwise becoming a pest themselves."

But there is a potential downside: the chance the wasp could go after one or more of North America's native stinkbugs and other insects.

"We do not want to cause harm to nontarget species," Hoelmer says. "That's why the host range of the Asian Trissolcus is being studied in the Newark laboratory before a request is made to release it."

Ultimately, the USDA's Animal and Plant Health Inspection Service will decide whether or not to introduce the wasp. If it does, the new natural enemy could be let loose as early as next year.

Do you have stinkbugs in your area? Have they invaded your home this winter? Or your garden last summer? How do you combat them? Share your sightings and stories in the comments.


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How Green Was the 'Green Pope'?


As the world's one billion Catholics wait for white smoke to rise above the Vatican, signaling the election of a new pontiff, it's how clear the air is elsewhere that will go a long way toward shaping the legacy of retiring Pope Benedict XVI. Among the many titles Benedict has been given over his eight-year reign, the "Green Pope" is certainly one of the most unexpected. But to Vatican observers, Green Pope is entirely appropriate, as the pontiff has made environmental awareness a key tenant of his tenure.

Benedict wasn't the first environmentally conscious pope. In 1990, Pope John Paul II went on record during a speech on the World Day of Peace urging Catholics to regard the natural world as one of God's creations worth protecting. By the time Benedict first put on his papal robes in 2005, caring for the environment had become an important part of the church's doctrine. Benedict gave the issue an even higher profile. He delivered homilies and speeches asking world leaders to take seriously the harm being inflicted on the planet. "If we want justice and peace, we must protect the habitat that sustains us," Benedict said on the 2010 World Day of Peace. Not long after, the influential Pontifical Academy of Sciences, a scientific arm of the Vatican, released a report on climate change recommending that world leaders cut carbon dioxide emissions, reduce existing pollution, and prepare for the inevitable impacts of a changing climate.

Benedict also made moves on his home turf. He approved a plan to cover the Vatican's Paul VI hall with solar panels, enough to power the lighting, heating, and cooling of a portion of the entire country (which covers, of course, a mere one-fifth of a square mile). He authorized the Vatican's bank to purchase carbon credits by funding a Hungarian forest that would make the Catholic city-state the only country fully carbon neutral. And several years later, he unveiled a new hybrid Popemobile that would be partially electric.

At a time when the church was dealing with more pressing structural issues within its ranks, some of Benedict's moves could be seen as simply good PR-inexpensive changes to build good will. Yet certain Vatican watchers see Benedict's efforts as genuine. "I think it's remarkable how much attention he gave to the environment; this for him was a big theme," said Walter Grazer, an adviser to the National Religious Partnership for the Environment and former spokesman for the U.S. Conference of Catholic Bishops (USCCB). In this regard, Benedict's advocacy, says Grazer, is likely to set the tone for a successor tasked with making the church's pastoral teachings more aligned with issues of modern life.

As world leaders gathered in half a dozen cities during Benedict's papacy to discuss global emissions treaties, Benedict did not participate, lacking an element of diplomatic gravitas as a head of state of a physically small country. Where Benedict did exert influence, however, was injecting morality into the environmental debate. Changing light bulbs or saving a wild animal by protecting habitat wasn't about saving money, Benedict implied, but was a religious obligation. "It's clear the church is now on the side of protecting the environment, seeing it as God's creation and something that should be respected," said Tom Reese, a Jesuit priest and senior fellow at Georgetown University's Woodstock Theological Center. "I think that the leaders of the environmental movement are now realizing the church is an ally."

The impetus for the church's environmental advocacy isn't all spiritual. There is obvious concern for how climate change will affect material quality of life, especially for the disadvantaged. Last year, the USCC, the Vatican's U.S. arm, issued a statement saying that the human response to environmental challenges "will affect poor and vulnerable people at home and around the world."

Benedict has echoed the same sentiment, at times stating publicly that the countries emitting the most greenhouse gas emissions aren't the ones feeling the most damaging impacts of rising oceans, extreme storms, and scarcity of water. "He has a great concern for what was going to happen to the poorest people as a result of environmental destruction," said Grazer.

As Benedict begins his retirement today, the better way to judge Benedict's influence might not be in how many solar panels he had installed at the Vatican or how many gallons of gasoline he saved with the Popemobile, but in how he harnessed the influence of his global church to act on the sort of change he advocated. Many national dioceses around the world now include "environmental stewardship" on their list of advocacy topics. In the U.S., bishops have created curricula for discussing sustainability in school and pushed local officials on issues like clean air. "I think many people have found inspirational Benedict's constant reference to the need to be responsible for the environment," said William Skylstad, bishop emeritus of the diocese of Spokane, Washington. Skylstad hopes the next pontiff will also be willing to carry the same green torch.


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Megadam Project Galvanizes Native Opposition in Malaysia


Most villages along the Baram River in Malaysia cannot count on round-the-clock electricity. Diesel generators hum at night near longhouses in the northwestern corner of the island of Borneo. Mobile and Internet coverage are almost nonexistent.

A plan to dam the Baram River would generate power far in excess of current demand in the rainforest state: At 1,000 megawatts, the hydropower project would be large enough to power 750,000 homes in the United States.

Yet the promise of power rings hollow for many who live here.

Natives from the tribes of Penan, Kenyah, and Kayan have taken to their traditional longboats, traveling downstream to the town of Long Lama to voice opposition to the plan. (See related quiz: "What You Don't Know About Water and Energy.")

Baram is one of seven big hydropower projects that Malaysia's largest state, Sarawak, is building in a bid to lure aluminum smelters, steelmakers, and other energy-intensive heavy industry with the promise of cheap power. Together, the dams mapped out in the state government's sprawling $105 billion Sarawak Corridor of Renewable Energy (SCORE) plan would harness nearly as much river power as the largest generating station in the world, the massive Three Gorges Dam in China. (See related photos: "A River People Awaits an Amazon Dam.")

The Sarawak project is changing landscape and lives. The dam across the sinuous Baram River will submerge 159 square miles (412 square kilometers) of rain forest, displacing some 20,000 indigenous people.

Open acts of defiance are rare in Sarawak after three decades of authoritarian rule under the state's Chief Minister Abdul Taib Mahmud, who has long battled charges that he has amassed personal wealth by selling off swaths of the rain forest in corrupt deals with timber industry. But protests have become increasingly bold among indigenous people opposed to the megahydro plan. Last September, native tribes set up a blockade to protest the Murum River dam project in western Sarawak. And in January, the longboat protest came to Long Lama, with shouts of "Stop Baram Dam" in indigenous languages reverberating through the normally quiet town.

"I don't care if I'm not reappointed" as the village chief by the government, said Panai Erang, 55, an ethnic Penan, one of several chiefs openly against the state-backed project. "I have to speak out for my people."

Power Transformation

Baram Dam is part of a grand eonomic-development vision for Sarawak, which along with Sabah is one of two Malaysian states on the northern coast of Borneo (map), along the South China Sea. Borneo, shared with Indonesia and Brunei, is one of the largest islands in the world, and home to one of its oldest rain forests. (See related story: "Borneo's Moment of Truth")

Endangered species such as Hose's civet, the Borneo gibbon, and six different species of hornbills rely on the habitat. The Bornean bay cat, one of the most elusive cats in the world, was sighted near the upper Baram River last November. Sarawak boasts more than 8,000 unique types of flora and 20,000 species of fauna, including one of the world's largest butterflies, the Rajah Brooke Birdwing, and one of the most extensive cave systems on Earth.

Despite its natural resources, Sarawak's economy has lagged behind the rest of Malaysia. An ever-widening economic gap, as well as a sea, separates Sarawak from the fast-growing states and bustling capital of Kuala Lumpur on the Malay peninsula. But Sarawak's SCORE plan aims to "transform Sarawak into a developed state by year 2020."

A government spokesperson close to Mahmud said Sarawak has to tap the hydro potential of its numerous rivers to power the state's industrial development.

"The people affected [by the dams] will be those who are living in small settlements scattered over remote areas," said the spokesperson, who asked not to be named, in an email. "They are still living in poverty.

"To build a dam, not just to generate reasonably priced energy, is also to involve the affected people in meaningful development," he said. "Otherwise, they will be left out."

The spokesperson added that Sarawak will also be exploiting its one to two billion tons of coal reserve for power. One of the coal plants is already operating in the developing township of Mukah. Malaysia's first aluminum smelter was opened here in 2009.

Sarawak's plan is to grow its economy by a factor of five, increase jobs, and double the population to 4.6 million by 2030.

But during the January protest at Long Lama, village chief Panai Erang said he and his people have little confidence that they will benefit from the new industrial development. Erang has visited the town of Sungai Asap, in central Sarawak, where 10,000 indigenous people already displaced by the first megadam project, Bakun Dam, were relocated. The forced exodus began in the late 1990s, and construction continued for more than a decade. With a capacity of 2,400 megawatts, Bakun, which opened in 2011, is currently Asia's largest hydroelectric dam outside China.

Erang said the settlers were given substandard houses and infertile farmland. Some have returned to Bakun and are living on floating houses at the dam site.

The community leader is fearful for the future of his villagers. Many do not possess a MyKad—the Malaysian national identification card—because of government policies making it difficult for them to prove citizenship. As a result, they cannot vote and would be unlikely to find employment if they were forced out of their ancestral homes into towns and cities.

"This is not the development that we want," said Salomon Gau, 48, an ethnic Kenyah from the village of Long Ikang, located downstream off the Baram River. "We don't need big dams. We want micro-hydro dams, [which are] more affordable and environmentally friendly."

Energy and Development

The concerns of the indigenous tribes are echoed by academics and activists from Malaysia and around the world. They worry about SCORE's potential social and environmental impact.

Benjamin Sovacool, founding manager of Vermont Law School's Energy Security and Justice Program, studied the SCORE project extensively. He and development consultant L.C. Bulan traveled the corridor and interviewed dozens of Sarawak planners and stakeholders to catalog the drivers and risks of the project. Their research, conducted at the National University of Singapore, was published last year in the journal Renewable Energy.

Government officials told the researchers that SCORE would improve prospects for those now living in villages, especially the young people: "They want gadgets, cars, nice clothes, and need to learn to survive in the modern economy," one project planner told Sovacool and Bulan. "They are not interested in picking some fruit in the forest, collecting bananas, hunting pigs."

And yet when the researchers visited the Sungai Asap resettlement community, they found people scraping for both water and food, oppressed by heat and rampant disease, with limited transportation options. "We had trouble sleeping at night due to coughing from a tuberculosis epidemic, malaria-carrying mosquitoes buzzing around our beds, and the smell of urine, since the longhouse lacked basic sanitation," they wrote.  Many community members had fled.

The squalor stands in marked contrast to the portrait of Sarawak that the SCORE project seeks to paint in its bid to attract new industry, a region of "world-class infrastructure, multimodal interconnectivity and competitive incentives," strategically located near potential fast-growing markets of India, China, and Indonesia.

Sovacool and Bulan noted that SCORE had encountered difficulties in finding investors and financiers, and flawed environmental impact assessments and questionable procurement practices would further hamper those efforts. (At least one major aluminum smelter plan was scrapped last year over a dispute over finances.) The authors concluded that SCORE might undermine Sarawak's greatest assets: "[I]t is taking what is special to Sarawak, its biodiversity and cultural heritage and destroying and converting it into electricity, a commodity available in almost every country on the planet."

And yet, Sovacool and Bulan wrote that such projects may become increasingly common globally, as governments seek to build energy systems and spur development at the same time.

Daniel Kammen, founder of the Renewable and Appropriate Energy Laboratory at the University of California, Berkeley, who has worked extensively on alternative energy solutions in Malaysia, thinks Sarawak should explore other renewable energy options before implementing SCORE's power projects.

"The political and infrastructure challenges are immense, and the ecological and cultural impacts have barely been evaluated," he told National Geographic News via email.

He said careful evaluation and planning in cooperation with communities could yield better solutions; Kammen's team's work was pivotal in the 2011 decision by neighboring state Sabah to scrap plans for a 300-megawatt coal plant in an ecologically sensitive habitat, and provide energy instead with natural gas.

"What is vital to the long-term social and economic development of [Sarawak], and of Borneo, is to explore the full range of options that are available to this resource-rich state, recognizing that community, cultural, and environmental resources have tremendous value that could be lost if the SCORE project goes ahead without a full analysis of the options that exist in the region," he said.

Mounting Resistance

The natives of Sarawak, including those from Baram, have already lost thousands of hectares of customary land to logging companies and oil palm plantation companies over the past few decades. The state government often cuts land lease deals with companies without consulting natives. Consequently, there are now more than 200 land-dispute court cases pending in Sarawak.

The Penans, a nomadic hunter-gatherer tribe, have suffered more than the Kenyah and Kayan agricultural tribes as they are entirely dependent on the forest for their livelihoods, and are well-known for their blockades against loggers.

But the dam development has united different tribes traditionally divided by their disparate interests. Unlike previous upheavals due to logging, the hydro projects will force tribes out of their ancestral land completely. Adding to anger is the appearance of nepotism in several of the deals; for example, Hamed Abdul Sepawi, chairperson of the state utility company Sarawak Energy Bhd, which is building the Murum Dam, is the cousin of chief minister Mahmud.

The tribes struggle to have their concerns heard. The opposition party that organized the longboat protest in January at Baram, The People's Justice Party, collected more than 7,000 signatures but the government-appointed regional chief refused to see the protestors.

In some cases, the opponents have received a better reception abroad. Peter Kallang, an ethnic Kenyah and chairperson of the Save Sarawak Rivers Network, and other local indigenous activists traveled to Australia late last year to draw attention to their plight. "Development isn't just about economic growth," said Kallang. "Will these mega projects really raise the standard of living among our indigenous communities?" With support of Australian green groups, the activists pressured dam operator and consultant Hydro Tasmania to withdraw from Sarawak's hydropower projects.  Reports say Hydro Tasmania told the campaigners it plans to leave Sarawak after it fulfills its current contractual obligations, but the company has maintained it has been a small player in the SCORE program.

In any event, the indigenous activists plan to step up their campaign against the dam in the coming weeks in anticipation of upcoming national elections. Sarawak and Sabah traditionally have been viewed as a stronghold for the Barisan Nasional coalition that has ruled Malaysia for half a century.

Malaysian opposition leader Anwar Ibrahim now views the rural states on Borneo as key to his bid to unseat the long-standing regime, due to the support he has garnered among increasingly organized indigenous tribes.

In uniting Sarawak's native peoples, the project to alter its rivers may, in the end, change the course of Malaysia.

This story is part of a special series that explores energy issues. For more, visit The Great Energy Challenge.


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A History of Balloon Crashes


A hot-air balloon exploded in Egypt yesterday as it carried 19 people over ancient ruins near Luxor. The cause is believed to be a torn gas hose. In Egypt as in many other countries, balloon rides are a popular way to sightsee.

The sport of hot-air ballooning dates to 1783, when a French balloon took to the skies with a sheep, a rooster, and a duck. Apparently, they landed safely. But throughout the history of the sport, there have been tragedies like the one in Egypt.

1785: Pioneering balloonist Jean-Francois Pilatre de Rozier and pilot Pierre Romain died when their balloon caught fire, possibly from a stray spark, and crashed during an attempt to cross the English Channel. They were the first to die in a balloon crash.

1923: Five balloonists participating in the Gordon Bennett Cup, a multi-day race that dates to 1906, were killed when lightning struck their balloons.

1924: Meteorologist C. LeRoy Meisinger and U.S. Army balloonist James T. Neely died after a lightning strike. They had set off from Scott Field in Illinois during a storm to study air pressure. Popular Mechanics dubbed them "martyrs of science."

1995: Tragedy strikes the Gordon Bennett Cup again. Belarusian forces shot down one of three balloons that drifted into their airspace from Poland. The two Americans on board died. The other balloonists were detained and fined for entering Belarus without a visa.

1989: Two hot air balloons collided during a sightseeing trip near Alice Springs, Australia. One balloon crashed to the ground killing all 13 people on board. The pilot of the other balloon was sentenced to a two-year prison term for "committing a dangerous act." Until today, this was considered the most deadly balloon accident.

2012: A balloon hit a power line and caught fire in New Zealand, killing all 11 on board. Investigators later determined that the pilot was not licensed to fly and had not taken  proper safety measures during the crash, like triggering the balloon's parachute and deflation system.

2012: A sightseeing balloon carrying 32 people crashed and caught fire during a thunderstorm in the Ljubljana Marshes in Slovenia. Six died; many other passengers were injured.


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Lost Continent Found in Indian Ocean


Evidence of a drowned "microcontinent" has been found in sand grains from the beaches of a small Indian Ocean island, scientists say.

A well-known tourist destination, Mauritius (map) is located about 1,200 miles (2,000 kilometers) off the coast of Africa, east of Madagascar. Scientists think the tiny island formed some nine million years ago from cooling lava spewed by undersea volcanoes.

But recently, researchers have found sand grains on Mauritius that contain fragments of the mineral zircon that are far older than the island, between 660 million and about 2 billion years old.

In a new study, detailed in the current issue of the journal Nature Geoscience, scientists concluded that the older minerals once belonged to a now vanished landmass, tiny bits of which were dragged up to the surface during the formation of Mauritius. (Also see "World's Oldest Rocks Suggest Early Earth Was Habitable.")

"When lavas moved through continental material on the way towards the surface, they picked up a few rocks containing zircon," study co-author Bjørn Jamtveit, a geologist at the University of Oslo in Norway, explained in an email.

Most of these rocks probably disintegrated and melted due to the high temperatures of the lavas, but some grains of zircons survived and were frozen into the lavas [during the eruption] and rolled down to form rocks on the Mauritian surface."

Prehistoric Atlantis

Jamtveit and his colleagues estimate that the lost microcontinent, which they have dubbed Mauritia, was about a quarter of the size of Madagascar (map).

Furthermore, based on a recalculation of how the ancient continents drifted apart, the scientists concluded that Mauritia was once a tiny part of a much larger "supercontinent" that included India and Madagascar, called Rodinia.

The three landmasses "were tucked together in one big continent prior to the formation of the Indian Ocean," Jamtveit said.

But like a prehistoric Atlantis, Mauritia was eventually drowned beneath the waves when India broke apart from Madagascar about 85 million years ago. (Also see "Slimmer Indian Continent Drifted Ten Times Faster.")

Ancient Rocks

Scientists have long suspected that volcanic islands might contain evidence of lost continents, and Jamtveit and his team decided to test this hypothesis during a layover in Mauritius as part of a longer research trip in 1999. (See volcano pictures.)

The stop in tropical Mauritius "was a very tempting thing to do for a Norwegian in the cold month of January," Jamtveit said.

Mauritius was a good test site because it was a relatively young island and, being formed from ocean lava, would not naturally contain zircon, a tough mineral that doesn't weather easily.

If zircon older than 9 million years was found on Mauritius, it would be good evidence of the presence of buried continental material, Jamtveit explained. (See lava and rock pictures.)

At first, the scientists crushed rocks from Mauritius to extract the zircon crystals, but this proved difficult because the crushing equipment contained zircon from other sites, raising the issue of contamination.

"That was a show stopper for a while," Jamtveit said.

A few years later, however, some members of the team returned to Mauritius and this time brought back sand from two different beaches for sampling.

The scientists extracted 20 zircon samples and successfully dated 8 of them by calculating the rate that the elements uranium and thorium inside of the samples slowly break down into lead.

"They all provided much older ages than the age of the Mauritius lavas," Jamtveit said. "In fact they gave ages consistent with the ages of known continental rocks in Madagascar, Seychelles, and India."

Missing Evidence?

Jérôme Dyment, a geologist at the Paris Institute of Earth Physics in France, said he's unconvinced by the work because it's possible that the ancient zircons found their way to the island by other means, for example as part of ship ballast or modern construction material.

"Extraordinary claims require extraordinary evidence, which are not given by the authors so far," said Dyment, who did not participate in the research.

"Finding zircons in sand is one thing, finding them within a rock is another one ... Finding the enclave of deep rocks that, according to the author's inference, bring them to the surface during an eruption would be much more convincing evidence."

Dyment added that if Mauritia was real, evidence for its existence should be found as part of a joint French and German experiment that installed deep-sea seismometers to investigate Earth's mantle around Réunion Island, which is situated about 120 miles (200 kilometers) from Mauritius. (Learn what's inside the Earth.)

"If a microcontinent lies under Réunion, it should be depicted by this experiment," said Dyment, who is part of the project, dubbed RHUM-RUM.

More Dismembered Continents to Be Found?

But Conall Mac Niocaill, a geologist at the University of Oxford in the U.K. who was also not involved in the study, said "the lines of evidence are, individually, only suggestive, but collectively they add up to a compelling story."

The zircons "produce a range of ages, but all yield ages older than 660 million years, and one is almost 2 billion years old," he added.

"There is no obvious source for them in Mauritius, and they are unlikely to have been blown in by the wind, or carried in by human activity, so the obvious conclusion is that the young volcanic lava sampled some older material on their way through the crust."

Based on the new findings, Mac Niocaill and others think other vanished microcontinents could be lurking beneath the Indian Ocean.

In fact, analyses of Earth's gravitational field have revealed other areas in the world's oceans where the rock appears to be thicker than normal and could be a sign of continental crusts.

"We know more about the topography of Mars than we do about the [topography] of the world's ocean floor, so there may well be other dismembered continents out there waiting to be discovered."



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Picture Archive: Dorothy Lamour and Jiggs, Circa 1938


Dorothy Lamour, most famous for her Road to ... series of movies with Bing Crosby and Bob Hope, never won an Oscar. In her 50-plus-year career as an actress, she never even got nominated.

Neither did Jiggs the chimpanzee, pictured here with Lamour on the set of Her Jungle Love in a photo published in the 1938 National Geographic story "Monkey Folk."

No animal has ever been nominated for an Oscar. According to Academy Award rules, only actors and actresses are eligible.

Uggie, the Jack Russell terrier from last year's best picture winner, The Artist, didn't rate a nod. The equines that portrayed Seabiscuit and War Horse, movies that were best picture contenders in their respective years, were also snubbed.

Even the seven piglets that played Babe, the eponymous star of the best picture nominee in 1998, didn't rate. And the outlook seems to be worsening for the animal kingdom's odds of ever getting its paws on that golden statuette.

This year, two movies nominated in the best picture category had creatures that were storyline drivers with significant on-screen time. Neither Beasts of the Southern Wild (which featured extinct aurochs) or Life of Pi (which featured a CGI Bengal tiger named Richard Parker) used real animals.

An Oscar's not the only way for animals to get ahead, though. Two years after this photo was published, the American Humane Association's Los Angeles Film & TV Unit was established to monitor and protect animals working on show business sets. The group's creation was spurred by the death of a horse during the filming of 1939's Jessie James.

Today, it's still the only organization that stamps "No Animals Were Harmed" onto a movie's closing credits.

Editor's note: This is part of a series of pieces that looks at the news through the lens of the National Geographic photo archives.


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Elderly Abandoned at World's Largest Religious Festival


Every 12 years, the northern Indian city of Allahabad plays host to a vast gathering of Hindu pilgrims called the Maha Kumbh Mela. This year, Allahabad is expected to host an estimated 80 million pilgrims between January and March. (See Kumbh Mela: Pictures From the Hindu Holy Festival)

People come to Allahabad to wash away their sins in the sacred River Ganges. For many it's the realization of their life's goal, and they emerge feeling joyful and rejuvenated. But there is also a darker side to the world's largest religious gathering, as some take advantage of the swirling crowds to abandon elderly relatives.

"They wait for this Maha Kumbh because many people are there so nobody will know," said one human rights activist who has helped people in this predicament and who wished to remain anonymous. "Old people have become useless, they don't want to look after them, so they leave them and go."

Anshu Malviya, an Allahabad-based social worker, confirmed that both men and women have been abandoned during the religious event, though it has happened more often to elderly widows. Numbers are hard to come by, since many people genuinely become separated from their groups in the crowd, and those who have been abandoned may not admit it. But Malviya estimates that dozens of people are deliberately abandoned during a Maha Kumbh Mela, at a very rough guess.

To a foreigner, it seems puzzling that these people are not capable of finding their own way home. Malviya smiles. "If you were Indian," he said, "you wouldn't be puzzled. Often they have never left their homes. They are not educated, they don't work. A lot of the time they don't even know which district their village is in."

Once the crowd disperses and the volunteer-run lost-and-found camps that provide temporary respite have packed away their tents, the abandoned elderly may have the option of entering a government-run shelter. Conditions are notoriously bad in these homes, however, and many prefer to remain on the streets, begging. Some gravitate to other holy cities such as Varanasi or Vrindavan where, if they're lucky, they are taken in by temples or charity-funded shelters.

In these cities, they join a much larger population, predominantly women, whose families no longer wish to support them, and who have been brought there because, in the Hindu religion, to die in these holy cities is to achieve moksha or Nirvana. Mohini Giri, a Delhi-based campaigner for women's rights and former chair of India's National Commission for Women, estimates that there are 10,000 such women in Varanasi and 16,000 in Vrindavan.

But even these women are just the tip of the iceberg, says economist Jean Drèze of the University of Allahabad, who has campaigned on social issues in India since 1979. "For one woman who has been explicitly parked in Vrindavan or Varanasi, there are a thousand or ten thousand who are living next door to their sons and are as good as abandoned, literally kept on a starvation diet," he said.

According to the Hindu ideal, a woman should be looked after until the end of her life by her male relatives—with responsibility for her shifting from her father to her husband to her son. But Martha Chen, a lecturer in public policy at Harvard University who published a study of widows in India in 2001, found that the reality was often very different.

Chen's survey of 562 widows of different ages revealed that about half of them were supporting themselves in households that did not include an adult male—either living alone, or with young children or other single women. Many of those who did live with their families reported harassment or even violence.

According to Drèze, the situation hasn't changed since Chen's study, despite the economic growth that has taken place in India, because widows remain vulnerable due to their lack of education and employment. In 2010, the World Bank reported that only 29 percent of the Indian workforce was female. Moreover, despite changes in the law designed to protect women's rights to property, in practice sons predominantly inherit from their parents—leaving women eternally dependent on men. In a country where 37 percent of the population still lives below the poverty line, elderly dependent relatives fall low on many people's lists of priorities.

This bleak picture is all too familiar to Devshran Singh, who oversees the Durga Kund old people's home in Varanasi. People don't pay toward the upkeep of their relatives, he said, and they rarely visit. In one case, a doctor brought an old woman to Durga Kund claiming she had been abandoned. After he had gone, the woman revealed that the doctor was her son. "In modern life," said Singh, "people don't have time for their elderly."

Drèze is currently campaigning for pensions for the elderly, including widows. Giri is working to make more women aware of their rights. And most experts agree that education, which is increasingly accessible to girls in India, will help improve women's plight. "Education is a big force of social change," said Drèze. "There's no doubt about that."


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Pictures: Best News Photos from 2013 World Photo Press Contest

Photograph courtesy Maika Elan, Most, via WPP
 
 

In Da Nang, Vietnam, Phan Thi Thuy and her partner, Dang Thi Bich Bay, relax after studying at school.

The couple, who has been together for a year, lives in a country that has historically been hostile to same-sex relations, but could also become the first Asian country to recognize gay marriage, despite past human rights issue and a long-standing stigma.

"We were all enchanted by this series," Tucker said. "They're tender portraits, but some are complicated. Some make you wonder if all is well with the couples."

The photo series, titled "The Pink Choice," took first prize in the "Contemporary Issues Stories" category for photographer Maika Elan's ability to both stir the viewers' imagination and engage with her subjects.

"A good picture stimulates imagination and you go with it. You're delighted to be stimulated and encouraged to think," Tucker said.

"You feel like you've been given access to people, and even a world, that you normally wouldn't have access to, but in a respectful way," she added.

Published February 22, 2013

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Pictures: Artifacts Provide Clues to Life in Early Christchurch

Photograph courtesy Jaden Harris, Underground Overground Archaeology
 
 
 

A tiny container for Holloway's ointment, less than two inches (five centimeters) wide, came from what was probably a brick-lined basement on Madras Street under a multistory modern commercial building.

British patent medicine entrepreneur Thomas Holloway began to advertise his ointment in 1837, claiming it would cure an impressive list of ailments—"Bad Legs, Bad Breasts, Burns, Bunions, Bite of Mosquitoes and Sandflies, Coco-bay, Chiego-foot, Chilblains, Chapped Hands, Corns (Soft), Cancers, Contracted and Stiff Joints, Elephantiasis, Fistulas, Gout, Glandular Swellings, Lumbago, Piles, Rheumatism, Scalds, Sore Nipples, Sore Throats, Skin Diseases, Scurvy, Sore Heads, Tumours, Ulcers, Wound(s), Yaws."

("Coco-bay" is a Jamaican word for a form of leprosy. "Chiego-foot" is a Trinidadian term that describes a foot covered in chigger bites.)

Holloway moved his company several times in London. "The changing address and the subtle differences in the wording and images that appear on these pots are what enable them to be dated," said Watson. The address on this particular pot—533 Oxford Street, London—indicates that it was made between 1867 and 1881.

Published February 21, 2013

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Florida Python Hunt Captures 68 Invasive Snakes


It's a wrap—the 2013 Python Challenge has nabbed 68 invasive Burmese pythons in Florida, organizers say. And experts are surprised so many of the elusive giants were caught.

Nearly 1,600 people from 38 states—most of them inexperienced hunters—registered for the chance to track down one of the animals, many of which descend from snakes that either escaped or were dumped into the wild.

Since being introduced, these Asian behemoths have flourished in Florida's swamps while also squeezing out local populations of the state's native mammals, especially in the Everglades. (See Everglades pictures.)

To highlight the python problem, the Florida Fish and Wildlife Conservation Commission and its partners launched the 2013 Python Challenge, which encouraged registered participants to catch as many pythons as they could between January 12 and February 10 in state wildlife-management areas within the Everglades.

The commission gave cash prizes to those who harvested the most and longest pythons.

Frank Mazzotti, a wildlife ecologist at the University of Florida and scientific leader for the challenge, said before the hunt that he would consider a harvest of 70 animals a success—and 68 is close enough to say the event met its goals.

It's unknown just how many Burmese pythons live in Florida, but catching 68 snakes is an "exceptional" number, added Kenneth Krysko, senior herpetologist at the Florida Museum of Natural History in Gainesville.

Snakes in the Grass

Finding 68 snakes is impressive, experts say, since it's so hard to find pythons. For one, it's been unusually warm lately in Florida, which means the reptiles—which normally sun themselves to regulate their body temperature—are staying in the brush, making them harder to detect, Krysko said.

On top of that, Burmese pythons are notoriously hard to locate, experts say.

The animals are so well camouflaged that people can stand right next to one and not notice it. "It's rare that you get to see them stretched out—most of the time they're blending in," said Cheryl Millett, a biologist at the Nature Conservancy, a Python Challenge partner.

What's more, the reptiles are ambush hunters, which means they spend much of their time lying in wait in dense vegetation, not moving, she said.

That's why Millett gave the hunters some tips, such as looking along the water's edge, where the snakes like to hang out, and also simply listening for "something big moving through the vegetation."

Even so, catching 68 snakes is "actually is a little more than I expected," said Millett.

No Walk in the Park

Ruben Ramirez, founder of the company Florida Python Hunters, won two prizes in the competition: First place for the most snakes captured—18—and second place for the largest python, which he said was close to 11 feet (3.4 meters) long. The biggest Burmese python caught in Florida, nabbed in 2012, measured 17.7 feet (5.4 meters).

"They're there, but they're not as easy to find as people think," said Ramirez. "You're not going to be stumbling over pythons in Miami." (Related blog post: "What It's Like to Be a Florida Python Hunter.")

All participants, some of whom had never hunted a python before, were trained to identify the difference between a Burmese python and Florida's native snakes, said Millett. No native snakes were accidentally killed, she said.

Hunters were also told to kill the snakes by either putting a bolt or a bullet through their heads, or decapitating them—all humane methods that result "in immediate loss of consciousness and destruction of the brain," according to the Python Challenge website.

Ramirez added that some of the first-time or amateur hunters had different expectations. "I think they were expecting to walk down a canal and see a 10-foot [3-meter], 15-foot [4.5-meter] Burmese python. They thought it'd be a walk in the park."

Stopping the Spread

Completely removing these snakes from the wild isn't easy, and some scientists see the Python Challenge as helping to achieve part of that goal. (Read an opposing view on the Python Challenge: "Opinion: Florida's Great Snake Hunt Is a Cheap Stunt.")

"You're talking about 68 more animals removed from the population that shouldn't be there—that's 68 more mouths that aren't being fed," said the Florida museum's Krysko. (Read about giant Burmese python meals that went bust.)

"I support any kind of event or program that not only informs the general public about introduced species, but also gets the public involved in removing these nonnative animals that don't belong there."

The Nature Conservancy's Millett said the challenge had two positive outcomes: boosting knowledge for both science and the public.

People who didn't want to hunt or touch the snakes could still help, she said, by reporting sightings of exotic species to 888-IVE-GOT-1, through free IveGot1 apps, or www.ivegot1.org.

Millett runs a public-private Nature Conservancy partnership called Python Patrol that the Florida wildlife commission will take on in the fall. The program focuses not only on eradicating invasive pythons but on preventing the snake from moving to ecologically sensitive areas, such as Key West.

Necropsies on the captured snakes will reveal what pythons are eating, and location data from the hunters will help scientists figure out where the snakes are living—valuable data for researchers working to stop their spread.

"This is the most [number of] pythons that have been caught in this short of a period of time in such an extensive area," said the University of Florida's Mazzotti.

"It's an unprecedented sample, and we're going to get a lot of information out of that."


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New Study Analyzes Heavy Metal Dancing


Parents may never understand their rock 'n' roll loving children, but scientists might. A study published online in arXiv this week seeks to explain the "mosh pit"—using physics.

To most scientists, heavy metal refers to elements on the lower end of the periodic table. But to Jesse Silverberg and Matt Bierbaum, doctoral students at Cornell University's department of Condensed Matter Physics, the aggressive music—and the violent dancing that accompanies it—could be a key to understanding extreme situations such as riots and panicked responses to disasters.

For the past two years, Silverberg and Bierbaum have studied "moshing," at heavy metal concerts, using theories of collective motion and the physical properties of gasses to better understand the chaos of metal fans' dancing.

Moshing, for those who have never attended a heavy metal show, is a form of dancing in which participants bump, jostle, and slam into one another. It's a form of social ritual that anthropologists have likened to spirit possession in its uncontrolled, dynamic, and often violent nature.

Silverberg and Bierbaum say it can also be understood by applying models of gaseous particles. As these particles float in groups, they too run, bash, and slam into each other, sending the elements flying in chaotic patterns.

"We are interested in how humans behave in similar excited states," said Silverberg, "but it's not exactly ethical to start a riot for research."

Extreme Physics

Mosh pits provided the scientists with a way to observe excited collective movement without causing undue injury or death. Analyzing hours of recorded footage from concerts and making multiple field trips to music clubs, Silverberg and Bierbaum recognized the particulate physical patterns in the mosh pit.

Further, they differentiated two distinct forms of heavy metal dancing: the "mosh pit" itself, which follows the gaseous pattern, and the "circle pit" (where dancers run, smash, and dance in a circular rotation) within it, which adheres to a vortex pattern of particulate behavior.

Based on these observations, they created an interactive computer model depicting the behavior.

Animal Instincts

"Herd animals behave in very similar spirit—what physicists call 'flocking' behavior," said Bierbaum. (See "The Genius of Swarms," from the July 2007 issue of National Geographic magazine.)

As with groups of flying birds or schooling fish, simple rules can be applied to individuals in large groups—like moshers—to understand what seems to be very complex behavior. This makes modeling possible, allowing computers to re-create immense numbers of actions in a matter of seconds. These models can then be used to design spaces that would minimize trampling or injury, or to tailor responses to disasters like fires.

"The lessons we've learned in mosh pits [could be used] to build better stadiums, or movie theaters," Silverberg said.

James Sethna, one of the researchers' advising professors, hastened to add that his students' forays into heavy metal science "didn't start out for reasons of creating safer stadiums. We did it because it was cool and we wanted to know if we could explain human behavior—albeit slightly intoxicated behavior—without having to use complex [models]."

A longtime heavy metal fan himself, Silverberg shared which band produced the best results: "Killswitch Engage ... always gets the crowd nuts. Although of course everyone has their own favorites."


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Confirmed: Dogs Sneak Food When People Aren't Looking


Many dog owners will swear their pups are up to something when out of view of watchful eyes. Shoes go missing, couches have mysterious teeth marks, and food disappears. They seem to disregard the word "no."

Now, a new study suggests dogs might understand people even better than we thought. (Related: "Animal Minds.")

The research shows that domestic dogs, when told not to snatch a piece of food, are more likely to disobey the command in a dark room than in a lit room.

This suggests that man's best friend is capable of understanding a human's point of view, said study leader Juliane Kaminski, a psychologist at the U.K.'s University of Portmouth.

"The one thing we can say is that dogs really have specialized skills in reading human communication," she said. "This is special in dogs." (Read "How to Build a Dog.")

Sneaky Canines

Kaminski and colleagues recruited 84 dogs, all of which were more than a year old, motivated by food, and comfortable with both strangers and dark rooms.

The team then set up experiments in which a person commanded a dog not to take a piece of food on the floor and repeated the commands in a room with different lighting scenarios ranging from fully lit to fully dark.

They found that the dogs were four times as likely to steal the food—and steal it more quickly—when the room was dark. (Take our dog quiz.)

"We were thinking what affected the dog was whether they saw the human, but seeing the human or not didn't affect the behavior," said Kaminski, whose study was published recently in the journal Animal Cognition.

Instead, she said, the dog's behavior depended on whether the food was in the light or not, suggesting that the dog made its decision based on whether the human could see them approaching the food.

"In a general sense, [Kaminski] and other researchers are interested in whether the dog has a theory of mind," said Alexandra Horowitz, head of the Dog Cognition Lab at Barnard University, who was not involved in the new study.

Something that all normal adult humans have, theory of mind is "an understanding that others have different perspective, knowledge, feelings than we do," said Horowitz, also the author of Inside of a Dog.

Smarter Than We Think

While research has previously been focused on our closer relatives—chimpanzees and bonobos—interest in dog cognition is increasing, thanks in part to owners wanting to know what their dogs are thinking. (Pictures: How smart are these animals?)

"The study of dog cognition suddenly began about 15 years ago," Horowitz said.

Part of the reason for that, said Brian Hare, director of the Duke Canine Cognition Lab and author of The Genius of Dogs, is that "science thought dogs were unremarkable."

But "dogs have a genius—years ago we didn't know what that was," said Hare, who was not involved in the new research. (See pictures of the the evolution of dogs, from wolf to woof.)

Many of the new dog studies are variations on research done with chimpanzees, bonobos, and even young children. Animal-cognition researchers are looking into dogs' ability to imitate, solve problems, or navigate social environments.

So just how much does your dog understand? It's much more than you—and science—probably thought.

Selectively bred as companions for thousands of years, dogs are especially attuned to human emotions—and, study leader Kaminski said, are better at reading human cues than even our closest mammalian relatives.

"There has been a physiological change in dogs because of domestication," Duke's Hare added. "Dogs want to bond with us in ways other species don't." (Related: "Dogs' Brains Reorganized by Breeding.")

While research reveals more and more insight into the minds of our furry best friends, Kaminski said, "We still don't know just how smart they are."


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Meet the Meteorite Hunter


Michael Farmer is one of the world's only full-time meteorite hunters. Since the 1990s, the 40-year-old Tucson, Arizona, resident has been scouring the world for pieces of interstellar rock, racing to be the first one on the scene and selling his finds to museums and private collectors. On Friday, as Russians reportedly scrambled to collect fragments from a passing meteorite that injured hundreds, Farmer spoke with National Geographic about his unusual line of work.

Why are so many people in Russia busy gathering up meteorite fragments?

It's a historic event. This will be talked about forever. Everyone wants to have a little piece of it. And scientifically, we want to study it. We want to know what's out there, and we want to know how big it is, and we want to know what damage it can cause. The preliminary data from NASA's Jet Propulsion Laboratory says about 7,000 tons landed.

How many meteorite fragments are known to be on Earth?

There are a couple of hundred thousand known meteorites. Of course, there's millions and millions on the planet; we just have to find them. Most of the Earth is inhospitable—heavy forest, jungle, ocean. Meteorites that fall in the ocean are just gone, disappeared to the bottom.

How many other full-time meteorite hunters are there?

Dedicated, serious meteorite hunters? There are maybe 20 of us. If you add in the part-timers who go somewhere whenever [an impact is] close to them, then you might approach a hundred.

How did you become a meteorite hunter?

Here in Tucson right now we have the world's biggest mineral show going on. I bought a meteorite at this very same show 20 years ago, and I was absolutely obsessed and hooked. Since then I've been around the world more times than I can count—four million miles on American Airlines alone.

How many countries have you been to?

About 70 countries, by my last count. About 50, 59 trips to Africa—a lot of work in Africa. The Sahara and other deserts there make meteorites easier to find than on other terrains, and also keep them well preserved.

What are the challenges you face when you're on a hunt?

Well, you're usually going into a kind of chaotic scene where nobody really knows much. In Africa and other places I go [the locals] don't usually understand what's happening, and most of the time they don't care. They're more concerned with eating that day. But the instant some guy shows up and says, "I'll pay you to find this rock," the whole village empties—and then lots of rocks show up.

Related: Best Meteorites for Tourists

It can be dangerous work. I've been robbed, put into prison. For example, I was in prison two years ago in the Middle East, in Oman—actually sentenced, convicted, and put in prison for three months for "illegal mining activity." Not a very nice time. And the same year, 2011, in the fall I went to Kenya three times, after a major meteorite fell. On the third trip over I had a robbery where they ambushed us and almost murdered me. I was down on my knees, with a bag over my head and a machete on my throat and a gun at my head, being beaten. Luckily they decided to just take everything and leave instead of killing us. It's a dangerous line of work because it involves money, and people want that money.

What's the most valuable meteorite you've found?

Well, I've found three separate moon rocks in the Middle East. [Moon rocks are considered a type of meteorite that came loose from the lunar surface and fell to Earth.] And one of them I sold for $100,000 a week later. It was just a small piece—the size of a walnut. But the best meteorite I found was with my three partners up in Canada. It was actually discovered in 1931, but we went back to the location and discovered 53 kilograms [117 pounds] more. It's an extremely rare type of meteorite called a pallasite, and it's about 4.5 billion years old. We sold it to the Canadian government for just under a million dollars. Now it's in the Royal Ontario Museum, in Toronto, and it's considered a national treasure.

Where else do you sell your wares?

Well, I do shows around the world, in France, Germany, Japan. I go to expos, like this one here in Tucson, which is the biggest mineral show in the world and lasts for three weeks. And museums are always calling me.

Related: Archival Photos of Meteorite Recovery

It's a small market. It's not like I need a shop or anything. People call me or email me or go to my website and check it out. The market these days is so ravenous for anything new that when I get a new meteorite, it's usually sold in hours. I don't even have to work anymore. I just make phone calls to a few people, and it's all gone.

Where do you store your collection?

I have multiple storage sites—never put all your eggs in one basket. And I have lots of bulk material. Sometimes I buy this stuff by the ton, and it goes into storage and I sell it off one piece at a time.

What's the verification process like?

Any meteorite, anything that we want to have an official name, has to go to a laboratory, where it gets sectioned and studied by scientists. For example, I'd guess this meteorite in Russia yesterday will be in a lab in Moscow, being researched within hours.

Related: History's Big Meteorite Crashes

In the collector market, we work collaboratively with the scientists. I supply them with rocks, and they supply me with data, both of which I need to make money. People want to know what something is before they buy it.

Are there legal or ethical implications to meteorite hunting?

There always are. Certain countries have passed laws. But when I was arrested in Oman, they actually had no law—they were just very upset that we were taking lots of meteorites. The only law they could charge us with was illegal mining operations—basically running a company in the country without government licensing. But I won on appeal because we had no mining equipment. We were picking up rocks off the surface of the desert. And a judge said, "If a child could do it, then it's not mining." And I was immediately released and sent home.

But there's always friction between the collecting market and the scientific market. There are scientists out there who believe that no meteorite should be in private hands. Well, I tell you, I've been on hunts all over the world and I've only run into scientists a couple of times. They don't have the time or money to do it. So if it wasn't for us, 99 percent of these meteorites would be lost to science.

What about this meteorite strike—do you think scientists will go to Russia?

I guarantee there'll be scientists from everywhere in the world going to this one.

Are you catching the next flight to Moscow?

Well, of course as a meteorite dealer, I want to own this. I woke up this morning to a hundred e-mails from people begging me to get on a plane and go get it so they can buy a piece.

But I'm probably not going. Getting into Russia can be complicated. I'll just buy some from the Russians when it comes out.

Of course, if this had happened in China or somewhere in Africa, I'd be packing my bags right now and getting on a plane, figuring it all out when I get there.


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Asteroid Impacts:10 Biggest Known Hits


There's one physical connection that isn't going down after Valentine's Day this year: Earth and asteroid.

The asteroid known as 2012 DA14 will narrowly miss Earth this Friday, the closest asteroid flyby on record. But the planet has not always been so lucky.

Earth's craters are enduring testaments to direct asteroid hits. And though millions—in some cases billions—of years of erosion have made it difficult to determine the exact size of the meteorites, there is a general scientific consensus around the world's largest craters, which mark the largest asteroid impacts.

Here are the ten biggest known:

1. Vredefort Crater

Asteroid impact date: Estimated 2 billion years ago

Location: Free State, South Africa

Specs: Also known as the Vredefort Dome, the Vredefort crater has an estimated radius of 118 miles (190 kilometers), making it the world's largest known impact structure. This crater was declared a UNESCO World Heritage Site in 2005.

2. Sudbury Basin

Asteroid impact date: Estimated 1.8 billion years ago

Location: Ontario, Canada

Specs: The Sudbury Basin is considered one of largest impact structures on Earth, with an estimated diameter of 81 miles (130 kilometers). Dating back 1.8 billion years, it is also one of the oldest known impact structures in the world.

3. Acraman Crater

Asteroid impact date: Estimated 580 million years ago

Location: South Australia, Australia

Specs: Located in what is now Lake Acraman, this impact structure has an estimated diameter of 56 miles (90 kilometers).

4. Woodleigh Crater

Asteroid impact date: Estimated 364 million years ago

Location: Western Australia, Australia

Specs: This crater is not exposed at the surface and has led to many discrepancies regarding its actual size. Reports on its diameter vary from 25 to 75 miles (40 to 120 kilometers).

5. Manicouagan Crater

Asteroid impact date: Estimated 215 million years ago

Location: Quebec, Canada

Specs: This impact crater formed what is now Lake Manicouagan. Even with erosion, it's considered one of the largest and best-preserved craters on Earth, with an estimated diameter of 62 miles (100 kilometers).

6. Morokweng Crater

Asteroid impact date: Estimated 145 million years ago

Location: North West, South Africa

Specs: Located near the Kalahari Desert in South Africa, this crater contained the fossilized remains of the meteorite that created it.

7. Kara Crater

Asteroid impact date: Estimated 70.3 million years ago

Location: Nenetsia, Russia

Specs: Now greatly eroded, the Kara crater is a non-exposed impact structure in Russia. Some have claimed that the impact structure actually consists of two adjacent craters: the Kara and the Ust-Kara crater.

8. Chicxulub Crater

Asteroid impact date: Estimated 65 million years ago

Location: Yucatán, Mexico

Specs: Located on the Yucatán Peninsula in Mexico, many scientists believe that the meteorite that left this crater caused or contributed to the extinction of the dinosaurs. Estimates of its actual diameter range from 106 to a whooping 186 miles (170 to 300 kilometers), which if proved right could mean it's the biggest.

9. Popigai Crater

Asteroid impact date: Estimated 35.7 million years ago

Location: Siberia, Russia

Specs: Russian scientists claim that this crater site contains trillions of carats of diamonds, making it one of the largest diamond deposits in the world. These diamonds have been referred to as "impact diamonds."

10. Chesapeake Bay Crater

Asteroid impact date: Estimated 35 million years ago

Location: Virginia, United States

Specs: Discovered in the early 1980s, the Chesapeake Bay Crater is located approximately 125 miles (201 kilometers) from Washington, D.C. Some estimates suggest this crater is 53 miles (85 kilometers) wide.


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Owl Monkeys Shed Light on Evolution of Love


It may not seem like monkey business, but emotional bonds in animals such as primates may have evolved into love as we know it.

Take owl monkeys, tiny tropical tree-dwellers that treat every day like it's Valentine's Day. A male and a female stick together as long as possible, never cheat, and never "divorce" their mates—extremely unusual behavior, even among people. (Also see "Male Monkeys Wash With Urine to Attract Females?")

Sometimes, though, young adult owl monkeys that can't find mates—monkeys that scientists call floaters—pick vicious fights with established pairs, eventually kicking one of them out.

Now, new research shows that the monkeys forced to take on new partners have fewer babies than owl monkeys that haven't been broken up, said Eduardo Fernandez-Duque, a biological anthropologist at the University of Pennsylvania in Philadelphia who led a new study on owl monkey relationships.

The results show how monogamy helps owl monkeys—and may even shed light on how human relationships evolved.

"Call it love, call it friendship, call it marriage—there is something in our biology that leads to this enduring, emotional bond between two individuals that is widespread among human societies," Fernandez-Duque said in a statement.

Trouble in Paradise

Only about 5 percent of mammals are monogamous, and the phenomenon most often arises when both parents are needed to raise offspring, as in the case of people.

With owl monkeys, fathers take on most of the childcare after a baby is born, relying on the mother only for milk. (See video: "Owl Monkey Fathers Know Best?")

But floaters—which Fernandez-Duque and colleagues first noticed in 2003 in Argentina's Chaco region (map)—can spell trouble in paradise.

Drawing on nearly two decades of observations of 18 owl monkey groups, the team discovered that pairs that stay intact produce 25 percent more babies than monkeys in severed pairs.

The exiled animal from those broken relationships, meanwhile, is usually injured and often dies.

Since the team studied more than 150 animals, "I felt very confident that what he was telling us is a real phenomenon—it's not a flash in the pan," noted Patricia Wright, who was one of the first people to study owl monkeys in the 1980s.

"He had the goods on the animals. I was really excited about that," said Wright, an anthropologist at Stony Brook University in New York.

Wright said she was personally pleased that the study reinforced findings that owl monkeys stay true to one another unless forced to separate.

"I knew that these little monkeys didn't fool around," she said.

Chemistry of Love

Why monkeys that are broken up have fewer babies is unknown, though Fernandez-Duque suspects there's an emotional component. (See more pictures of all-star animal dads.)

Just as a man and a woman need time to get to know each other and form a deep connection, so do owl monkeys. So when a marauding monkey enters into a new relationship, there's a delay in mating—usually about a year, Fernandez-Duque  said.

In fact, pair bonding in monogamous animals, such as owl monkeys, may be "sort of evolutionary antecedent to love in humans," said Larry Young, a behavioral neuroscientist at Emory University in Atlanta and author of the new book The Chemistry Between Us: Love, Sex, and the Science of Attraction.

Young, who studies the brain chemistry of love and emotion, does most of his research on monogamous prairie voles.

Though human love is a rich emotion reflective of our advanced brains, he said, "the foundation of that emotion is very similar to the neuromechanisms that are causing the bond between these two prairie voles."

For instance, experiments have shown that if a vole loses its partner, the "widowed" animal shows depressive symptoms—measured by a lack of willingness to escape a dangerous situation.

According to Young, our brains are in the love seat, so to speak: The organs "have evolved the mechanism to produce an emotional attachment," he said.

That attachment is spurred by oxytocin—produced during intimate contact in both people and animals—and dopamine, which is responsible for feelings of exhilaration and happiness.

So, many splendored as it is, love, he said, "is really the result of a cocktail of chemicals."

The owl monkey study was published January 23 in the journal PLoS ONE.


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Where Will Pope Benedict XVI Retire?


Someone with a suspicious mind and deep knowledge of Vatican trivia might have guessed that something was going on months ago. Last November, a community of cloistered nuns vacated the  Mater Ecclesiae monastery, located inside Vatican Gardens, two years before they were expected to do so.

The monastery has since been closed for renovation.

On Monday, in the press conference that followed Pope Benedict XVI's announcement that he will resign at the end of the month, Father Federico Lombardi, director of the Holy See Press Office,  revealed that the monastery will be the retired pontiff's new home. (Photo Gallery: Inside the Vatican.)

"When renovation work on the monastery of cloistered nuns inside the Vatican is complete, the Holy Father will move there for a period of prayer and reflection," Lombardi said.

Until then, the pope will stay at the Apostolical Palace and the Pontifical Villas in Castel Gandolfo, a small lake town about 15 miles (24 kilometers) southeast of Rome, which serves as the traditional summer residence for popes.

The Mater Ecclesiae monastery was founded in 1992 by Benedict's predecessor, John Paul II, "to create a place to house an international convent for contemplative life within the walls of Vatican City," according to the Vatican City State website.

It has housed small communities of cloistered nuns whose main task has been to provide spiritual assistance to the pope and to the Roman Catholic Church as a whole by praying in Latin and singing Gregorian chants.

The nuns would also embroider papal garments and cultivate a small organic orchard and a rose garden next to their residence. In a 2009 interview with the Vatican newspaper L'Osservatore Romano, the monastery's then abbess said that Benedict particularly appreciated the special-recipe marmalade that the nuns would prepare out of the oranges and lemons they picked in the Vatican orchard.

It is not yet clear for how long the soon-to-be-former pope will stay at the monastery. Lombardi has said that Benedict will not participate in the March conclave that will elect his successor, stressing that there will be "no confusion or division arising from his resignation."

Lombardi also said that he wasn't sure of Benedict's future title-there are no canon law provisions or historical precedents regarding the statute, prerogatives, or titles for a retired pope.

Resignations of Popes Past

Only a handful of popes have willfully or forcefully resigned in the church's history, the last case going back to 1415, almost 600 years ago.

"It was Pope Gregory XII, who, in a very sacrificial gesture, offered to resign so that the Council of Constance could assume his power and appoint a new pope, and in so doing bring an end [to the] Great Western Schism," Donald Prudlo, associate professor of history at Jacksonville State University in Alabama, told Vatican Radio.

Italian and foreign commentators have been likening Benedict's choice to a famous case of papal abdication-that of Celestine V, who was elected in 1294 and left the Roman throne only five months later.

"At the end of the 13th century, a very holy hermit named Peter was elected as Pope Celestine V in order to break a deadlock in the conclave that had lasted nearly three years," Prudlo explained. "He was elected because of his personal holiness, sort of a unity candidate. And once he got there, being a hermit, not used to the ways of the Roman Curia, he found himself somewhat unsuited to the task."

So he resigned and lived as a hermit—or, some historians say, as a prisoner—in a castle belonging to his successor, Boniface VIII, before dying in 1296.

Celestine is widely recognized as the object of Dante Alighieri's scolding verses in his Divine Comedy. The former pope was proclaimed saint in 1313.

In 2009, Benedict XVI visited Celestine's tomb in L'Aquila (map) and left the pallium—a vestment that is the symbol of papal authority—on the grave. Now that gesture is being interpreted as a premonition of the choice he would eventually make.


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Biggest Crocodile Dies in Captivity


Lolong is the largest crocodile in captivity no longer.

The 20.24-foot-long (6.17-meter-long) saltwater crocodile died recently at his home in the Bunawan Eco-Park and Research Centre in the Philippines' Bunawan township (map), according to news reports.

In July, Guinness World Records named the behemoth, which was captured alive in September 2011, the largest crocodile in captivity. (See pictures of Lolong's capture.)

The previous captive record-holder was a 17.97-foot-long (5.48-meter-long) Australian-caught saltwater crocodile.

The cause of death is unknown, although a post-mortem may reveal more details, CNN reported.

Biggest Crocodile Boosted Conservation

The giant reptile's death is a loss to crocodile conservation in the country, Philippines' Environment Secretary Ramon Pajeto told CNN affiliate ABS-CBN News.

Indeed, the 2,370-pound (1,075-kilogram) Lolong may have inspired people in the Philippines to "perhaps respect crocodiles a little bit more,"Adam Britton, senior partner of the Australia-based crocodilian research and consulting group Big Gecko, wrote on his blog in June 2012. (See pictures of alligators and crocodiles.)

For instance, in 2011 Philippine Senate introduced a resolution to strengthen laws protecting the saltwater crocodile and the Philippine crocodile, a species deemed critically endangered by the International Union for Conservation of Nature.

Lolong will still loom large even after death, however—Paje told ABS-CNN that the reptile will be stuffed and mounted.


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