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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Ex-Beatle's widow lauds Ravi Shankar at US memorial

ENCINITAS, California: Former Beatle George Harrison's widow Olivia joined hundreds of fans and family of Ravi Shankar on Thursday at an open-air memorial to the Indian sitar legend near his California home.

Anoushka Shankar, daughter of the late musician who died last week near San Diego, and her step-sister Grammy-winning singer Norah Jones also paid their last respects at the service in a palm tree-lined meditation centre.

Tributes were read out from fellow musicians and artists who had been inspired by Shankar, labelled "The Godfather of World Music" by the Beatles and compared to Mozart by violin maestro Yehudi Menuhin.

Harrison, whose late husband learned sitar from Shankar and collaborated with him notably on the ground-breaking Concert for Bangladesh in 1971, said the former Beatle had learned so much from their friendship.

"They were like father and son as well as brothers... they made each other laugh as if they shared a secret. And I'm sure they did," said the 64-year-old, whose husband died of cancer in 2001.

Shankar "laid the stepping stones from West to East, that led George to new concepts, alternative philosophies and completely transformed his musical sensibilities," she said.

"They exchanged ideas and melodies until their minds and hearts, East and West, were entwined, like a double helix," she added in Encinitas, where Shankar had a home.

Shankar's 31-year-old daughter Anoushka -- also a sitar player, and just nominated for a Grammy -- told the audience that her father would have approved of the memorial's venue, the Self-Realization Fellowship spiritual centre.

"My father loved spending time here so much, so it feels so right for us to be here celebrating his journey," she said, before tributes were read out from singer Peter Gabriel and film director Martin Scorsese.

Gabriel said: "Ravi Shankar opened the door to non-Western music for millions of people around the world."

"His music has such power, seeming ancient and immediate, impassioned and meditative, full of sorrow and joy. He was a true master," said Scorsese, "From the first time I met him ... his brilliant sitar playing has mesmerised me."

Shankar died last Tuesday at the age of 92, after failing to recover from surgery at a hospital in La Jolla, near San Diego. His family was at his bedside.

Private memorial services were announced both in the United States and India, where Shankar also had a home.

Jazzy soul singer Jones, Shankar's daughter from an affair with a US concert producer, was dressed in black and kept a low profile at Thursday's event in Encinitas, up the coast from San Diego.

His widow Sukanya was also at the California memorial, which started with prayers chanted by M.N. Nandakumara of the Bharatiya Vidya Bhavan institute for Indian art and culture in London.

Nandakumara said that Shankar's music "brought people of various countries, communities together to his soul-stirring music, which was matchless.

"I do not know another musician who has understood the Eastern and Western music the way (Shankar) understood it, and interpreted it in such a way that people around the world were mesmerized by it," he said.

As well as Indian family and friends, Thursday's event -- at which speakers were flanked on stage by photos of Shankar at various stages of his life -- was attended by locals and other fans and followers.

"He's local, he's part of the community here," said Eddy Jimenez, a musician and trumpet player from Encinitas, comparing Shankar's influence and music to that of Harrison's fellow Beatle John Lennon.

"He's a bridge between humanity, really, not just East and West. I'm just here to pay my respects," the 61-year-old told AFP.

-AFP/fl

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Facebook begins rolling out new privacy tools

Facebook began rolling out new tools this evening that it touts as helping users better manage who can see what on the social network.

Facebook is not changing what settings users can set, except for the option to block profile searches within the social network. The network has already begun phasing out this feature and soon it will be removed from everyone's profiles.

Facebook says these new changes are designed to give users more flexibility with their privacy.

"We believe that the better you understand who can see the things you share, the better your experience on Facebook can be," Sam Lessin, a director of product for Facebook, said in a statement.

As detailed last week, the new tools include Privacy Shortcuts, an updated Activity Log, and a Request and Removal tool for managing tagged photos. It also added an education feature intended to explain key concepts about sharing privacy.

A privacy setting shortcuts menu has been added to the tool bar at the top of page, letting users pick what privacy settings they want to change base on questions rather than by setting: Who can see my stuff? Who can contact me? How do I stop someone from bothering me?

The new Activity Log -- where users can review and delete their activity -- includes new tools for deleting unwanted content. In addition to a "Request and Removal" tool, users can go to the "Photos of You" tab and select multiple pictures for untagging or removal.

Facebook also added a tutorial to educate users about their privacy actions. For example, when a user hides a post from a Timeline, a message will pop up that explains that while the post is hidden on the Timeline, it will still show in other places, such as their friends' news feeds and in searches.

CNET's Donna Tam contributed to this report.

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Hollies Get Prickly for a Reason

With shiny evergreen leaves and bright red berries, holly trees are a naturally festive decoration seen throughout the Christmas season.

They're famously sharp. But not all holly leaves are prickly, even on the same tree. And scientists now think they know how the plants are able to make sharper leaves, seemingly at will. (Watch a video about how Christmas trees are made.)

A new study published in the Botanical Journal of the Linnean Society suggests leaf variations on a single tree are the combined result of animals browsing on them and the trees' swift molecular response to that sort of environmental pressure.

Carlos Herrera of the National Research Council of Spain led the study in southeastern Spain. He and his team investigated the European holly tree, Ilex aquifolium. Hollies, like other plants, can make different types of leaves at the same time. This is called heterophylly. Out of the 40 holly trees they studied, 39 trees displayed different kinds of leaves, both prickly and smooth.

Five holly leaves from the same tree.

Photographs by Emmanuel Lattes, Alamy

Some trees looked like they had been browsed upon by wild goats and deer. On those trees, the lower 8 feet (2.5 meters) had more prickly leaves, while higher up the leaves tended to be smooth. Scientists wanted to figure out how the holly trees could make the change in leaf shape so quickly.

All of the leaves on a tree are genetic twins and share exactly the same DNA sequence. By looking in the DNA for traces of a chemical process called methylation, which modifies DNA but doesn't alter the organism's genetic sequence, the team could determine whether leaf variation was a response to environmental or genetic changes. They found a relationship between recent browsing by animals, the growth of prickly leaves, and methylation.

"In holly, what we found is that the DNA of prickly leaves was significantly less methylated than prickless leaves, and from this we inferred that methylation changes are ultimately responsible for leaf shape changes," Herrera said. "The novelty of our study is that we show that these well-known changes in leaf type are associated with differences in DNA methylation patterns, that is, epigenetic changes that do not depend on variation in the sequence of DNA."

"Heterophylly is an obvious feature of a well-known species, and this has been ascribed to browsing. However, until now, no one has been able to come up with a mechanism for how this occurs," said Mike Fay, chief editor of the Botanical Journal of the Linnean Society and head of genetics at the Kew Royal Botanic Gardens. "With this new study, we are now one major step forward towards understanding how."

Epigenetic changes take place independently of variation in the genetic DNA sequence. (Read more about epigenetics in National Geographic magazine's "A Thing or Two About Twins.")

"This has clear and important implications for plant conservation," Herrera said. In natural populations that have their genetic variation depleted by habitat loss, the ability to respond quickly, without waiting for slower DNA changes, could help organisms survive accelerated environmental change. The plants' adaptability, he says, is an "optimistic note" amidst so many conservation concerns. (Related: "Wild Holly, Mistletoe, Spread With Warmer Winters.")

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Boehner Pulls Plan B Option

In a surprise development late Thursday night, House Speaker John Boehner pulled his so-called "Plan B option" -- an extension of current tax rates for Americans making up to $1 million a year -- from the House floor, admitting that it did not have the support necessary to pass and leaving a resolution to the fiscal cliff in question.

"The House did not take up the tax measure today because it did not have sufficient support from our members to pass. Now it is up to the president to work with [Democratic Senate Majority Leader Harry] Reid on legislation to avert the fiscal cliff," Boehner, R-Ohio, wrote in a statement. "The House has already passed legislation to stop all of the Jan. 1 tax rate increases and replace the sequester with responsible spending cuts that will begin to address our nation's crippling debt. The Senate must now act."

Immediately after the announcement that "plan B" had failed, Dow Jones Industrial futures traded down, with other stock indicators also signaling sharp losses and volatility for Friday morning's opening -- though stock futures generally are lightly traded in the evening. Indicators soon bounced off the initial lows but still signaled a rough start to the final trading session of the week.

In Washington, all legislative business has concluded for the week. House Majority Leader Eric Cantor's office said that members could still return "after the Christmas holiday when needed" if a breakthrough is eventually reached.

Jacquelyn Martin/AP Photo

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The outlook for a deal to avert the "fiscal cliff" by Christmas has reached a new low, with no clear path forward, though lawmakers and the White House maintained hope this week for a deficit-reduction compromise by the end of the year.

A senior aide to the speaker confirmed late Thursday evening that Boehner and Obama still have not spoken since Monday evening, when the speaker told the president that he would move ahead with his backup plan, although staff-level talks have continued behind the scenes.

"Speaker Boehner tried to play hardball by asking his members to vote for a tax increase. He learned the hard way that you must find a bipartisan solution," one senior House Democratic leadership aide said reacting to the developments. "Walking away has considerably weakened him and put the country literally on the precipice of the cliff."

Republicans had sought to act to avoid an income tax hike on 99 percent of Americans in 2013, and leverage new pressure on President Obama in the ongoing talks for a broader "cliff" deal.

Obama has threatened to veto the legislation, calling it counterproductive and the cuts burdensome for the middle class, and Reid, D-Nev., has promised not to bring it up for consideration in the Senate.

"'Plan B' ... is a multi-day exercise in futility at a time when we do not have the luxury of exercises in futility," said White House spokesman Jay Carney Thursday.

Democrats complained that the posturing on "plan B" distracted the focus from a broader bargain on taxes, spending, entitlement reforms and other measures that had begun coming into focus earlier this week.

Reid said the Senate would break for the Christmas holiday but return to Washington one week from Thursday. President Obama will not join his family in Hawaii on Friday as planned if the "cliff" is not resolved, an administration official said.

"If you look at Speaker Boehner's proposal and you look at my proposal, they're actually pretty close," Obama said Wednesday, appealing for a big "fair deal."

"It is a deal that can get done," he said. "But it cannot be done if every side wants 100 percent. And part of what voters were looking for is some compromise up here."

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Human hands evolved so we could punch each other

Forget toolmaking, think fisticuffs. Did evolution shape our hands not for dexterity but to form fists so we could punch other people? That idea emerges from a new study, although it runs counter to conventional wisdom.

About the same time as we stopped hanging from trees and started walking upright, our hands become short and square, with opposable thumbs. These anatomical changes are thought to have evolved for tool manipulation, but David Carrier at the University of Utah in Salt Lake City has an alternative explanation.

He says there are several possible hand shapes that would have allowed greater dexterity, making it less clear why we ended up with the hands we have. But only one hand shape lets us make a fist with a thumb as buttress.

Among primates' hands, ours is unique for its ability to form a fist with the thumb outside the fingers. The fingers of other primates' hands are too long to curl into their palms, and their thumbs are too short to reach across the fingers. So when apes fight, they are far more likely to wrestle or hold their opponent down while others stomp on him, says Carrier.

To test the importance of fists, Carrier and his colleagues recruited 10 athletes and measured how hard they could hit a punching bag using a normal fist, a fist with the thumb stuck out, and with an open palm.

The athletes could generate more than twice the force with a normal fist as with the thumb-stuck-out fist, because of thumb's buttressing role. There was no difference in the force they could generate with a normal fist and with an open palm, but Carrier says it's possible that a fist concentrates the force into a smaller area and so does more damage.

Cause or effect?

Mary Marzke of Arizona State University in Tempe says the study is interesting, but it far from proves that the ability to make a strong fist was the main driver behind the evolution of our hands' shape. It is more likely that it was a useful side effect of a whole suite of modifications.

She points out that apes strike with the heel of their hand when knocking fruit out of trees. Carrier's study didn't assess the force that the heel of the hand generates, but if it turns out to be as good as a fist, it becomes less clear that our hands evolved so as to be perfect for fist-making, Marzke says.

But if the hypothesis is true, Carrier thinks it could explain another mystery. It has long been unclear why high levels of testosterone cause men's ring fingers to be longer than their index fingers. He says the finger-length ratio makes sense if it generates a better fist. This would make dominant males even better fighters.

Journal reference: Journal of Experimental Biology, doi:10.1242/jeb.075713

If you would like to reuse any content from New Scientist, either in print or online, please contact the syndication department first for permission. New Scientist does not own rights to photos, but there are a variety of licensing options available for use of articles and graphics we own the copyright to.

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Apple "pinch-to-zoom" patent deemed invalid

SAN FRANCISCO: A filing in a high-stakes legal battle between Samsung and Apple revealed that a "pinch-to-zoom" patent central to the case has been deemed invalid.

The patent was a centerpiece of a trial that ended in August with a jury ordering Samsung to pay Apple $1.05 billion in damages for illegally copying iPhone and iPad features for its flagship Galaxy S smartphones.

Samsung provided US District Judge Lucy Koh a copy of a US Patent and Trademark Office preliminary determination that, upon review, the Apple pinch-to-zoom technology wasn't original enough to merit a patent.

Samsung hoped the filing would bolster its argument for a new trial or to have the damages award slashed.

Since the verdict, US patent officials tentatively invalidated an Apple patent on technology that gives a "rubber-band" springing effect when a finger tugs at the edge of a touch-screen smartphone. That patent was also at issue at the trial.

Koh on Monday denied Apple's request to ban a set of Samsung smartphones from the US market based on the jury's finding that the South Korean firm was guilty of infringing on six of the Cupertino, California-company's patents.

Even though Apple was victorious in the patent case, the iPhone and iPad maker failed to prove that the technology at issue was the driving factor in people's buying decisions, Koh reasoned in the ruling.

Samsung -- the world's top mobile and smartphone maker -- has appealed the verdict.

- AFP/al

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Twitter shuffles top execs, names new COO and CFO

Twitter CEO Dick Costolo confirmed via tweet today that the massive social network is now being headed by a new chief operating officer and chief financial officer.

Ali Rowghani moves into the COO position from his previous post of CFO at Twitter. Rowghani has been with the social network since 2010, when he joined the company after serving as CFO for the Disney-owned Pixar Animation Studios. According to AllThingsD, Rowghani is known for multi-tasking at the social network and contributing to Twitter's Promoted Suite of ad products.
Mike Gupta moved into Rowghani's former position after working as the treasurer for Zynga. According to AllThingsD, Gupta was at Zynga for about a year and beforehand worked as a high-level executive at Yahoo where he worked on online partnership deals with Microsoft.

It will be interesting to see what these two will do in coming up with ideas to create more revenue for Twitter.

In the past few months, the social network has been pushing hard on structural changes in hopes that it will boost profitability. In September, it announced a new mobile-first strategy aimed at settling on more user experience consistency across its many clients -- Web, iPhone, iPad, and
Android -- a move that it clearly hopes will help increase advertising revenue.

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Detecting Rabid Bats Before They Bite

A picture is worth a thousand words—or in the case of bats, a rabies diagnosis. A new study reveals that rabid bats have cooler faces compared to uninfected colony-mates. And researchers are hopeful that thermal scans of bat faces could improve rabies surveillance in wild colonies, preventing outbreaks that introduce infections into other animals—including humans.

Bats are a major reservoir for the rabies virus, according to the Centers for Disease Control and Prevention (CDC) in Atlanta. Previous research shows that bats can transmit their strains to other animals, potentially putting people at risk. (Popular Videos: Bats share the screen with creepy co-stars.)

Rabies, typically transmitted in saliva, targets the brain and is almost always fatal in animals and people if left untreated. No current tests detect rabies in live animals—only brain tissue analysis is accurate.

Searching for a way to detect the virus in bats before the animals died, rabies specialist James Ellison and his colleagues at the CDC turned to a captive colony of big brown bats (Eptesicus fuscus). Previous studies had found temperature increases in the noses of rabid raccoons, so the team expected to see similar results with bats.

Researchers established normal temperature ranges for E. fuscus—the bat species most commonly sent for rabies testing—then injected 24 individuals with the virus. The 21-day study monitored facial temperatures with infrared cameras, and 13 of the 21 bats that developed rabies showed temperature drops of more than 4ºC.

"I was surprised to find the bats' faces were cooler because rabies causes inflammation—and that creates heat," said Ellison. "No one has done this before with bats," he added, and so researchers aren't sure what's causing the temperature changes they've discovered in the mammals. (Related: "Bats Have Superfast Muscles—A Mammal First.")

Although thermal scans didn't catch every instance of rabies in the colony, this method may be a way to detect the virus in bats before symptoms appear. The team plans to fine-tune their measurements of facial temperatures, and then Ellison hopes to try surveillance in the field.

This study was published online November 9 in Zoonoses and Public Health.

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Obama Invokes Newtown on 'Cliff' Deal

Invoking the somber aftermath of the school massacre in Newtown, Conn., President Obama today appealed to congressional Republicans to embrace a standing "fair deal" on taxes and spending that would avert the fiscal cliff in 13 days.

"If there's one thing we should have after this week, it should be a sense of perspective about what's important," Obama said at a midday news conference.

"I would like to think that members of that [Republican] caucus would say to themselves, 'You know what? We disagree with the president on a whole bunch of things,'" he said. "'But right now what the country needs is for us to compromise.'"

House Speaker John Boehner's response: "Get serious."

Boehner announced at a 52-second news conference that the House will vote Thursday to approve a "plan B" to a broad White House deal -- and authorize simply extending current tax rates for people earning less than $1 million a year and little more.

"Then, the president will have a decision to make," the Ohio Republican said. "He can call on Senate Democrats to pass that bill or he could be responsible for the largest tax increase in American history."

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Unless Congress acts by Dec. 31, every American will face higher income tax rates and government programs will get hit with deep automatic cuts starting in 2013.

Obama and Boehner have been inching closer to a deal on tax hikes and spending cuts to help reduce the deficit. But they have not yet had a breakthrough on a deal.

Obama's latest plan would raise $1.2 trillion in new tax revenue over 10 years, largely through higher tax rates on incomes above $400,000. He also proposes roughly $930 billion in spending cuts, including new limits on entitlement spending, such as slower annual cost-of-living increases for Social Security beneficiaries.

Boehner has agreed to $1 trillion in new tax revenue, with a tax rate hike for households earning over $1 million. He is seeking more than $1 trillion in spending cuts, with significant changes to Medicare and Social Security.

The president said today that he remains "optimistic" about reaching a broad compromise by Christmas because both sides are "pretty close," a sentiment that has been publicly shared by Boehner.

But the speaker's backup plan has, at least temporarily, stymied talks, with no reported contact between the sides since Monday.

"The speaker should return to the negotiating table with the president because if he does I firmly believe we can have an agreement before Christmas," said Sen. Chuck Schumer, D-N.Y., a White House ally.

Schumer said Obama and Boehner are "not that far apart" in the negotiations.

"If they were to come to an agreement by Friday, they could write this stuff over the Christmas break and then we'd have to come back before the New Year and pass it," Schumer said.

Obama said he is "open to conversations" and planned to reach out to congressional leaders over the next few days to try to nudge Republicans to accept a "fair deal."

"At some point, there's got to be, I think, a recognition on the part of my Republican friends that -- you know, take the deal," he told reporters.

"They keep on finding ways to say no, as opposed to finding ways to say yes," Obama added. "At some point, you know, they've got take me out of it and think about their voters and think about what's best for the country."

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