Today on New Scientist: 21 December 2012

Cadaver stem cells offer new hope of life after death

Stem cells can be extracted from bone marrow five days after death to be used in life-saving treatments

Apple's patents under fire at US patent office

The tech firm is skating on thin ice with some of the patents that won it a $1 billion settlement against Samsung

Himalayan dam-building threatens endemic species

The world's highest mountains look set to become home to a huge number of dams - good news for clean energy but bad news for biodiversity

Astrophile: Black hole exposed as a dwarf in disguise

A white dwarf star caught mimicking a black hole's X-ray flashes may be the first in a new class of binary star systems

Blind juggling robot keeps a ball in the air for hours

The robot, which has no visual sensors, can juggle a ball flawlessly by analysing its trajectory

Studio sessions show how Bengalese finch stays in tune

This songbird doesn't need technological aids to stay in tune - and it's smart enough to not worry when it hears notes that are too far off to be true

Giant tooth hints at truly monumental dinosaur

A lone tooth found in Argentina may have belonged to a dinosaur even larger than those we know of, but what to call it?

Avian flu virus learns to fly without wings

A strain of bird flu that hit the Netherlands in 2003 travelled by air, a hitherto suspected by unproven route of transmission

Feedback: Are wind turbines really fans?

A tale of "disease-spreading" wind farms, the trouble with quantifying "don't know", the death of parody in the UK, and more

The link between devaluing animals and discrimination

Our feelings about other animals have important consequences for how we treat humans, say prejudice researchers Gordon Hodson and Kimberly Costello

Best videos of 2012: First motion MRI of unborn twins

Watch twins fight for space in the womb, as we reach number 6 in our countdown of the top videos of the year

2012 Flash Fiction winner: Sleep by Richard Clarke

Congratulations to Richard Clarke, who won the 2012 New Scientist Flash Fiction competition with a clever work of satire

Urban Byzantine monks gave in to temptation

They were supposed to live on an ascetic diet of mainly bread and water, but the monks in 6th-century Jerusalem were tucking into animal products

The pregnant promise of fetal medicine

As prenatal diagnosis and treatment advance, we are entering difficult ethical territory

2013 Smart Guide: Searching for human origins in Asia

Africa is where humanity began, where we took our first steps, but those interested in the latest cool stuff on our origins should now look to Asia instead

The end of the world is an opportunity, not a threat

Don't waste time bemoaning the demise of the old order; get on with building the new one

Victorian counting device gets speedy quantum makeover

A photon-based version of a 19th-century mechanical device could bring quantum computers a step closer

Did learning to fly give bats super-immunity?

When bats first took to the air, something changed in their DNA which may have triggered their incredible immunity to viruses

Van-sized space rock is a cosmic oddball

Fragments from a meteor that exploded over California in April are unusually low in amino acids, putting a twist on one theory of how life on Earth began

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CIA chief decries torture in Osama bin Laden hunt movie

WASHINGTON: Acting CIA director Michael Morell said that "Zero Dark Thirty," the Hollywood take on the hunt for Osama bin Laden, exaggerates the importance of information obtained by harsh interrogations.

The movie by Academy Award-winning director Kathryn Bigelow tells the story of the decade-long search after September 11, 2001 that climaxed in last year's dramatic and deadly raid in May on the Al-Qaeda terror leader's hideout in Abbottabad, Pakistan.

The film shows US personnel using harsh interrogation techniques like water-boarding -- a method widely seen as torture -- to force captives to speak. The information obtained was crucial, according to the movie, in piecing together the trail that eventually led to bin Laden.

Not so, Morell said in a message to Central Intelligence Agency employees released to AFP on Saturday.

The movie "creates the strong impression that the enhanced interrogation techniques that were part of our former detention and interrogation program were the key to finding bin Laden. That impression is false."

Morell's message, sent to the employees on Friday, states that "multiple streams of intelligence" led CIA analysts to conclude that bin Laden was hiding in Abbottabad.

He acknowledged that "some" of the information "came from detainees subjected to enhanced techniques. But there were many other sources as well."

The controversial techniques were banned in 2009 by President Barack Obama.

Morell said that "whether enhanced interrogation techniques were the only timely and effective way to obtain information from those detainees, as the film suggests, is a matter of debate that cannot and never will be definitively resolved."

Morell is widely believed to be a top candidate for the job of CIA director after the resignation of David Petreaus, America's most celebrated military leader in a generation. Petreaus stepped down in November after admitting to an extra-marital affair with his biographer.

Morell's message, first reported by The New York Times, echoes a statement decrying the "Zero Dark Thirty" interrogation scenes signed by three senators, including Republican John McCain, himself a prisoner of war and torture victim during the Vietnam War.

In a letter to the head of Sony Pictures, McCain -- the 2008 Republican presidential candidate -- and Democratic senators Diane Feinstein and Carl Levin wrote that the movie "clearly implies that the CIA's coercive interrogation techniques were effective" in obtaining information that would lead to bin Laden.

"We have reviewed CIA records and know that this is incorrect," the senators wrote. "We believe that you have an obligation to state that the role of torture in the hunt for (Bin Laden) is not based on the facts, but rather part of the film's fictional narrative."

However two CIA officials active when suspects were tortured disputed those assertions.

Jose Rodriguez, who oversaw the CIA's counterterrorism operations when "harsh interrogation" methods were in use, wrote in the Washington Post in April that the path leading to bin Laden "started in a CIA black site ... and stemmed from information obtained from hardened terrorists who agreed to tell us some (but not all) of what they knew after undergoing harsh but legal interrogation methods."

And former CIA director Michael Hayden wrote in a Wall Street Journal in June 2011 that a "crucial component" of information that eventually led to bin Laden came from three CIA prisoners, "all of whom had been subjected to some form of enhanced interrogation."

Hayden claimed that he learned the information when, in 2007, he was first briefed about pursuing bin Laden through his courier network.

But interim CIA director Morell emphasized the film, a likely Oscar contender, "takes significant artistic licence, while portraying itself as being historically accurate."

"What I want you to know is that Zero Dark Thirty is a dramatization, not a realistic portrayal of the facts.

"CIA interacted with the filmmakers through our Office of Public Affairs but, as is true with any entertainment project with which we interact, we do not control the final product."

- AFP/jc

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Rape protesters hit with water cannon

India rape protest

India rape protest

India rape protest

India rape protest

India rape protest

India rape protest

India rape protest

India rape protest

India rape protest

India rape protest

STORY HIGHLIGHTS

• Dozens of people are hurt in protests in New Delhi's government district


• Police blast anti-rape protesters with water cannon, fire tear gas


• Demonstrators wave banners, chant "We want justice"


• Police say a 23-year-old woman was gang-raped, badly beaten on a New Delhi bus

New Delhi (CNN) -- Police in India blasted protesters with water cannon and tear gas Saturday as clashes broke out at a rally in New Delhi against rape, leaving scores of people drenched and angry.

The demonstration was prompted by wide public outrage over what police said was the gang-rape and beating of a 23-year-old woman on a moving bus in the capital last Sunday.

Her injuries were so severe she spent days in intensive care in a city hospital, battling for her life. Police said Saturday that she had recovered enough to give a statement to a magistrate from her hospital bed the previous evening.

Dozens of police, some equipped with bamboo canes, flanked the water cannon as it blasted out on to the thousands of protesters assembled by New Delhi's historic India Gate.

Some demonstrators attempted to break through the security barriers blocking access to the country's government district, parliament building and presidential palace.

Others chanted, punched the air in defiance and waved banners as the police sought to disperse them from Raisina Hill, the seat of Indian power.

"Hang them till death," read the placard of one protester seeking capital punishment for rape suspects.

"Stop this shame," read another. A third said, "Give them the same physical torture."

Shouts of "We want justice" also rose above the large and diverse crowd, symbolizing a widely felt anger over attacks against women. Banners proclaiming the same message were marked with a hangman's noose.

Surviving rape: iReporters speak out

One young woman protester, who said her leg was injured by a blow from a police baton, lamented what she called a failure of democracy in the country.

"Today, I have seen democracy dying," she said.

New Delhi's police spokesman Rajan Bhagat said up to 35 protesters and nearly 40 police personnel were injured.

Thirty barricades were damaged in the course of the protest, he said, and police fired 125 tear gas shells. A number of vehicles were also damaged, he said.

Saturday's furious protest was just the latest held across the country in the past week, where official data show that rape cases have jumped almost 875% over the past 40 years -- from 2,487 in 1971 to 24,206 in 2011.

New Delhi alone reported 572 rapes last year and more than 600 in 2012.

Bhavyaa Sharma, a 19-year-old student at a leading women's college in the capital, told CNN how she fears for her safety when she leaves the campus. Sexual assaults on women in the city have horrified her and her female friends.

"I feel vulnerable here," said Sharma, accompanied by her classmates. "I am very sure about it. Delhi is not safe for women."

Opinion: Rapes show that Indian society needs a new attitude

Six suspects, including the bus driver and a minor, have now been arrested in connection with Sunday's rape.

As fury about the assault gathered pace, some Indian lawmakers even called for treating rape as a capital crime.

"We'll work collectively to see we make a law which is deterrent and preventive," said New Delhi's chief minister, Sheila Dikshit.

India's Home Minister Sushilkumar Shinde told reporters Saturday that the government would work toward increasing punishment in "rarest of the rare" rape cases.

But pressed on whether the administration would agree to demands for death by hanging in such instances, he said: "We'll have to see in what way it (the rape sentencing) can be enhanced."

Shinde said the government was pushing for a speedy trial for the attack.

Authorities are also taking a number of steps to improve security for women in New Delhi, particularly on public transport, he said.

"(The) government shares the widespread concern and support that has been expressed throughout society for the girl who has so suffered. Government also respects the right of legitimate protest," he said.

"At the same time, there is need to exercise calm at this juncture and for everyone to work together to improve the safety and security environment."

In the meantime, the victim has been promised the best possible medical care, Shinde said.

A physician described the woman's condition Saturday as better than a day earlier, but said there was still a risk of infection. She is receiving psychological as well as medical care, he said.

Read more: Indian girl seeks justice after gang rape

Following the brutal assault, the country's human rights body shot off notices to city police and federal authorities, demanding an explanation.

"The incident has raised the issue of declining public confidence in the law and order machinery in the city, especially in its capacity to ensure safety of women, as a number of such incidents have been reported in the national capital in the recent past," the National Human Rights Commission said in a statement Tuesday.

Home Secretary R. K. Singh announced the suspension of five police officers in the wake of Sunday's rape.

Meantime, some observers say anti-women acts in India stem from the country's largely patriarchal social setup.

Indians' preference for sons over daughters, for example, has manifested itself in a worrisome population imbalance. The 2011 census of the world's second-most populous nation recorded an alarming drop in the percentage of girls among country's preschoolers.

For every 1,000 boys up to 6 years old, the census counted 914 girls, a drop from 927 a decade ago. It's illegal in India to abort a child because of its sex, but such abortions happen, often aided by illegal clinics.

CNN's Harmeet Shah Singh and Mallika Kapur reported from New Delhi, and Laura Smith-Spark wrote from London.

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Newtown swamped by charity for victims, families

NEWTOWN, Conn. Peter Leone was busy making deli sandwiches and working the register at his Newtown General Store when he got a phone call from Alaska. It was a woman who wanted to give him her credit card number.

"She said, 'I'm paying for the next $500 of food that goes out your door,'" Leone said. "About a half hour later another gentleman called, I think from the West Coast, and he did the same thing for $2,000."

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Funerals and tributes for Newtown victims

Money, toys, food and other gifts have poured in from around the world as Newtown mourns the loss of 20 children and six school employees at Sandy Hook Elementary School a little over a week ago. The 20-year-old shooter, Adam Lanza, killed his mother before attacking the school then killing himself. Police don't know what caused him to massacre first-graders, teachers, school staff or his mother.

Saturday, all the town's children were invited to town hall to choose from among hundreds of toys donated by individuals, organizations and toy stores.

The basement of the building resembled a toy store, with piles of stuffed penguins, Barbie dolls, board games, soccer balls and other fun gifts. All the toys were inspected and examined by bomb-sniffing dogs before being sorted and put on card tables. The children could choose whatever they wanted.

"But we're not checking IDs at the door," said Tom Mahoney, the building administrator, who's in charge of handling gifts. "If there is a child from another town who comes in need of a toy, we're not going to turn them away."

The United Way of Western Connecticut said the official fund for donations had $2.6 million in it Saturday morning. Others sent envelopes stuffed with cash to pay for coffee, and a shipment of cupcakes arrived from a gourmet bakery in Beverly Hills, Calif.

The Postal Service reported a six-fold increase in mail in town and set up a unique post office box to handle it. The parcels come decorated with rainbows and hearts drawn by school children.

Some letters arrive in packs of 26 identical envelopes — one for each family of the children and staff killed or addressed to the "First Responders" or just "The People of Newtown." One card arrived from Georgia addressed to "The families of 6 amazing women and 20 beloved angels." Many contain checks.

Postal worker Christine Dugas sorts letters at the post office in Newtown, Conn., Friday, Dec. 21, 2012, including a letter addressed to "The families of 6 Amazing Women and 20 Beloved Angels.

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AP Photo/Julio Cortez

"This is just the proof of the love that's in this country," said Postmaster Cathy Zieff.

Many people have placed flowers, candles and stuffed animals at makeshift memorials that have popped up all over town. Others are stopping by the Edmond Town Hall on Main Street to drop off food, or toys, or cash.

"There's so much stuff coming in," Mahoney, of Newtown, said. "To be honest, it's a bit overwhelming; you just want to close the doors and turn the phone off."

Mahoney said the town of some 27,000 with a median household income of more than $111,000 plans to donate whatever is left over to shelters or other charities.

Sean Gillespie of Colchester, who attended Sandy Hook Elementary, and Lauren Minor, who works at U.S. Foodservice in Norwich, came from Calvary Chapel in Uncasville with a car filled with food donated by U.S. Foodservice. But they were sent elsewhere because the refrigerators in Newtown were overflowing with donations.

"We'll find someplace," Gillespie said. "It won't go to waste."

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Urban Advocates Say New Gun Control Talk Overdue

For years, voices have cried in the urban wilderness: We need to talk about gun control.

Yet the guns blazed on.

It took a small-town slaughter for gun control to become a political priority. Now, decades' worth of big-city arguments against easy access to guns are finally being heard, because an unstable young man invaded an elementary school in Newtown, Conn., with a military-style assault rifle and 30-bullet magazines. Twenty young children and six adults were slain.

President Barack Obama called the tragedy a "wake-up call." Vice President Joe Biden met Thursday with Obama's cabinet and law-enforcement officers from around the country to launch a task force on reducing gun violence. Lawmakers who have long resisted gun control are saying something must be done.

Such action is energizing those who have sought to reduce urban gun violence. Donations are up in some places; other leaders have been working overtime due to this unprecedented moment.

The moment also is causing some to reflect on the sudden change of heart. Why now? Why weren't we moved to act by the killing of so many other children, albeit one by one, in urban areas?

Certainly, Newtown is a special case, 6- and 7-year-olds riddled with bullets inside the sanctuary of a classroom. Even in a nation rife with violence, where there have been three other mass slayings since July and millions enjoy virtual killing via video games, the nature of this tragedy is shocking.

Critics Slam NRA for Proposing Armed School Guards Watch Video

Gun Violence Victims, Survivors Share Thoughts After Newtown Massacre Watch Video

But still: "There's a lot of talk now about we have to protect our children. We have to protect all of our children, not just the ones living in the suburbs," said Tammerlin Drummond, a columnist for the Oakland Tribune.

In her column Monday, Drummond wrote about 7-year-old Heaven Sutton of Chicago, who was standing next to her mother selling candy when she was killed in the crossfire of a gang shootout. Also in Chicago, which has been plagued by a recent spike in gun violence: 6-year-old Aaliyah Shell was caught in a drive-by while standing on her front porch; and 13-year-old Tyquan Tyler was killed when a someone in a car shot into a group of youths outside a party.

Wrote Drummond: "It has taken the murders of 20 babies and six adults in an upper-middle class neighborhood in Connecticut to achieve what thousands of gun fatalities in urban communities all over this country could not."

So again: What took so long? The answers are complicated by many factors: resignation to urban violence, even among some of those who live there; the assumption that cities are dangerous and small towns safe; the idea that some urban victims place themselves in harm's way.

In March, the Children's Defense Fund issued a report titled "Protect Children, Not Guns 2012." It analyzed the latest federal data and counted 299 children under age 10 killed by guns in 2008 and 2009. That figure included 173 preschool-age children.

Black children and teens accounted for 45 percent of all child and teen gun deaths, even though they were only 15 percent of the child/teen population.

"Every child's life is sacred and it is long past time that we protect it," said CDF president Marian Wright Edelman in the report.

It got almost no press coverage — until nine months later, when Newtown happened.

Tim Stevens, founder and chairman of the Black Political Empowerment Project in Pittsburgh, has been focusing on urban gun violence since 2007, when he said Pennsylvania was declared the worst state for black-on-black violence.

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Strong 6.8 quake strikes off Vanuatu: USGS

SYDNEY: A strong 6.8-magnitude earthquake hit off the coast of the South Pacific island of Vanuatu on Saturday, the US Geological Survey said, but no immediate tsunami warning was issued.

The quake struck at a depth of more than 200 kilometres around 2230 GMT Friday some 130 kilometres north of Santo, USGS said.

"It's quite deep ... so there's no tsunami," said David Jepsen, a seismologist with Geoscience Australia which measured the quake at 6.6 magnitude.

"I think it's well away from (the capital) Port Vila... but it's closer to some of the islands further to the northwest, but they would have had some moderate shaking really," he told AFP.

The Hawaii-based Pacific Tsunami Warning Center said a destructive tsunami was not generated, based on the earthquake and historical tsunami data.

Vanuatu lies on the so-called "Pacific Ring of Fire", a zone of frequent seismic activity caused by friction between shifting tectonic plates.

It has been rocked by several large quakes in recent years, averaging about three magnitude 7.0 or above incidents every year without any major damage.

- AFP/jc

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3 charged in deadly home explosion

By Logan Burruss, CNN

updated 6:11 PM EST, Fri December 21, 2012

Bob Leonard Jr., left, Mark Leonard and Monserrate Shirley are accused in a deadly explosion.

STORY HIGHLIGHTS

• Two brothers among accused in explosion at that killed couple next door


• Explosion injured 12 other people and caused $4 million in damage


• Investigators found abnormalities in gas line at suspect's home, affidavit says

(CNN) -- Three Indiana residents were arrested Friday on charges of arson and felony murder in a fatal house explosion in Indianapolis in November, according to the Marion County, Indiana, prosecutor's office.

Monserrate Shirley and brothers Mark Leonard and Bob Leonard Jr. were arrested Friday morning and charged with two counts of felony murder in the deaths of John and Jennifer Longworth, the neighbors of Shirley and Mark Leonard who were killed by the explosion at Shirley's home in the Richmond Hill area on November 10.

"We have to acknowledge that we are helpless to alleviate the pain and anguish of such innocent victims and their families," prosecutor Terry Curry said at a news conference Friday, according to a news release. "However, what we as a public safety community can do and must do is devote our best efforts to see that justice is served on behalf of those victims."

The explosion also injured 12 people and caused roughly $4 million in residential damage, according to the prosecutor's office.

An investigation led by local and federal authorities, including the Bureau of Alcohol, Tobacco, Firearms and Explosives, revealed suspicious behavior and circumstances surrounding the explosion. In particular, various elements of the gas line at Shirley's home may have been tampered with before the blast, including a missing step-down regulator, which reduces gas pressure entering the home, and a missing on/off valve to the residence's gas fireplace.

"The absence of the valve and regulator would explain how such a large volume of gas would be released into the home," Curry told CNN.

In addition, the digital thermostat at Shirley's home had been replaced by a slide-switch thermostat that "will produce a spark when the thermostat reaches a specified temperature," the probable cause affidavit says. However, it appears that the thermostat did not contribute to the explosion; instead, it appears to have been started by the microwave in the kitchen, which was a model that could be programmed to start 24 hours in advance.

Witnesses interviewed during the investigation indicated that the three accused may have a long history of fraud, particularly Mark Leonard, who has allegedly been participating in confidence schemes since 1995, according to the affidavit. The investigation also revealed that Shirley filed for bankruptcy in 2012.

In addition to two counts of felony murder, the accused are charged with conspiracy to commit arson, 12 counts of arson as a Class A felony and 33 counts of arson as a Class B felony. Mark Leonard and Shirley were also charged with conspiracy to commit arson as a Class B felony. They are being held at the Marion County Jail without bail, and an initial court hearing is scheduled for Monday morning.

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NRA: Guns in schools would protect students

Updated: 6:44 p.m. ET

In a press conference reflecting on last week's massacre in Newtown, Conn., the National Rifle Association's Wayne LaPierre today called on Congress to put armed law enforcement agents in every American school, insisting that guns in schools -- not tougher gun laws -- would most effectively protect children from school shootings.

Play Video

A "good guy with a gun" in every school?

LaPierre, who did not take any questions and whose remarks were interrupted twice by pro-gun control protesters, disdained the notion that stricter gun laws could have prevented "monsters" like Adam Lanza from committing mass shootings, and wondered why students, unlike banks, don't have the protection of armed officials. He also called for a "national database of the mentally ill."

"The only thing that stops a bad guy with a gun is a good guy with a gun," he said.

Twenty first-grade students were gunned down at their Connecticut elementary school last Friday, when 20-year-old Lanza reportedly opened fire in the school. Six adult faculty members were killed in his rampage, and Lanza also took his own life. Shortly before entering Sandy Hook Elementary School, Lanza is believed to have killed his mother, Nancy Lanza, in her bed. In the aftermath of the shootings, there has been much speculation as to the state of Adam Lanza's mental health, but no concrete evidence has been established that he was mentally ill.

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60 Minutes archives: Understanding the NRA

In the aftermath of the shooting, the NRA stayed largely silent, making only a brief comment earlier this week when announcing today's press conference. In his remarks today, however, LaPierre vehemently defended the pro-gun agency against critics and offered up a solution of his own.

"We must speak for the safety of our nation's children," said LaPierre. "We care about our money, so we protect our banks with armed guards. American airports, office buildings, power plants, courthouses, even sports stadiums, are all protected by armed security. We care about our president, so we protect him with armed Secret Service agents. Members of Congress works in offices surrounded by Capitol police officers, yet when it comes to our most beloved innocent and vulnerable members of the American family -- our children -- we as a society leave them every day utterly defenseless. And the monsters and the predators of the world know it and exploit it."

"That must change now," argued LaPierre, moments before being interrupted by a protester carrying a large pink sign proclaiming that the "NRA is killing our kids." "The truth is that our society is populated by an unknown number of genuine monsters -- people so deranged, so evil, so possessed by voices and driven by demons that no sane person can possibly ever comprehend them. They walk among us every day. And does anybody really believe that the next Adam Lanza isn't planning his attack on a school he's already identified at this very moment?"

Play Video

60 Minutes archives: The anti-gun lobby

Alternately criticizing politicians, the media, and the entertainment industry, LaPierre argued that "the press and political class here in Washington [are] so consumed by fear and hatred of the NRA and America's gun owners" that they overlook what he claims is the real solution to the nation's recent surge in mass shootings -- and what, he said, could have saved lives last week.

"What if, when Adam Lanza started shooting his way into Sandy Hook Elementary School last Friday, he had been confronted by qualified, armed security?" he asked. "Will you at least admit it's possible that 26 innocent lives might have been spared? Is that so abhorrent to you that you would rather continue to risk the alternative?"

LaPierre called on Congress to put a police officer in every school in America, which according to a Slate analysis would cost the nation at least $5.4 billion. LaPierre recognized that local budgets are "strained," but urged lawmakers "to act immediately, to appropriate whatever is necessary to put armed police officers in every school." He offered up the NRA's unique "knowledge, dedication, and resources" to assist in efforts to train those forces, but made no mention of a fiscal contribution. 

Columbine High School employed an armed guard, Neil Gardner, at the time of the 1999 school shootings. According to CNN, Gardner was eating lunch in his car when violence broke out in the school, and 13 people were killed.

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Protesters disrupt NRA press conference

Gun control advocates immediately decried LaPierre's comments, and New York City Mayor Michael Bloomberg called the press conference a "shameful evasion of the crisis facing our country."

"Instead of offering solutions to a problem they have helped create, they offered a paranoid, dystopian vision of a more dangerous and violent America where everyone is armed and no place is safe," he said. "Leadership is about taking responsibility, especially in times of crisis. Today the NRA's lobbyists blamed everyone but themselves for the crisis of gun violence."

On Twitter, Senator-elect Chris Murphy, D-Ct., called LaPierre's comments "the most revolting, tone-deaf statement I've ever seen."

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Obama Says He Is 'Ready and Willing' to Get Deal

President Barack Obama says he is "ready and willing" to get a big package done to deal with the "fiscal cliff" and says there's no reason not to protect middle-class Americans from tax increases.

Mandel Ngan/AFP/Getty Images

Fiscal Cliff: Boehner Doesn't Have Votes for Plan B Watch Video

Next Steps for Fiscal Cliff? 'God Only Knows,' Says Boehner Watch Video

'Fiscal Cliff' Negotiations: Boehner's Plan B Watch Video

Obama says he spoke Friday with House Speaker John Boehner and met with Senate Majority Leader Harry Reid. He says Congress should pass a plan to extend tax breaks for the middle class and extend unemployment benefits.

Obama says no one can get 100 percent of what they want and there are "real consequences" to how they deal with the across-the-board tax increases and steep spending cuts scheduled to kick in Jan. 1. Economists fear the combination could deliver a blow to the U.S. economy.

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Van-sized space rock is a cosmic oddball

The shattered remains of a high-profile space rock are oddly low in organic materials, the raw ingredients for life. The discovery adds a slight wrinkle to the theory that early Earth was seeded with organics by meteorite impacts.

In April a van-sized meteor was seen streaking over northern California and Nevada in broad daylight. The fireball exploded with a sonic boom and sprayed the region with fragments. Videos, photographs and weather radar data allowed the meteor's trajectory to be reconstructed, and teams quickly mobilised to search for pieces in the foothills of the Sierra Nevada in northern California.

Researchers readily identified the meteorites as rare CM chondrites, thought to be one of the oldest types of rock in the universe. "Because the meteorites were discovered so freshly, for the first time we had a chance to study this type of meteorite in a pristine form," says Peter Jenniskens of the SETI Institute in Mountain View, California, who led the search effort and the subsequent study of the space rocks.

Jenniskens personally found a fragment in a parking lot, where it remained relatively free of soil contaminants. "That's the best you could hope for, other than landing in a freezer," says Daniel Glavin of NASA's Goddard Space Flight Center in Greenbelt, Maryland.

Battered past

CM chondrites make up only about 1 per cent of known meteorites. Most of them contain plenty of organic materials, including amino acids, the building blocks of life on Earth.

Jenniskens and colleagues found that the California fragments also have amino acids, including some not found naturally on Earth. But in three rocks collected before a heavy rainstorm, which bathed the other pieces in earthly contaminants, organics are less abundant by a factor of 1000 than in previously studied CM chondrites.

These three rocks could not have lost organics due to space "weathering": analysis of the meteorites' exposure to cosmic rays suggests the original meteor was flying through space for only about 50,000 years before hitting Earth.

Based on its trajectory and its relatively short flight time, Jenniskens thinks the meteor can be traced back to a family of asteroids dominated by 495 Eulalia, a group known as a possible source of CM chondrites. It is probably a piece that broke off during an impact, revealing the relatively pristine material inside.

So what happened to its organics? Jenniskens' team found that the meteorites are breccia – smaller rocks cemented together – which suggests that the asteroid from which they came took a series of beatings. Those impacts, or possibly other processes inside the asteroid, could have heated it enough to destroy most organic material.

Limited delivery

The result might have implications for the organics delivery theory, says Bill Bottke of the Southwest Research Institute in Boulder, Colorado.

"It shows that not all asteroids can deliver sufficient quantities. One of the disappointments is that, from a prebiotic organic chemistry perspective, it was very limited," says Bottke. "But this is an unusual case. Most [CM chondrites] are loaded with organic compounds."

Still, studying the space rocks will help us prepare future missions to asteroids such as OSIRIS-Rex, scheduled to take off for asteroid 1999 RQ36 in 2016 and bring a sample back in 2023.

"In some ways, we've had a sample, a very fresh one, come to us," says Bottke. "This is a test bed for the techniques we'll use in that mission."

Journal reference: Science, DOI: 10.1126/science.1227163

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