Hip implants a bit more likely to fail in women

CHICAGO (AP) — Hip replacements are slightly more likely to fail in women than in men, according to one of the largest studies of its kind in U.S. patients. The risk of the implants failing is low, but women were 29 percent more likely than men to need a repeat surgery within the first three years.

The message for women considering hip replacement surgery remains unclear. It's not known which models of hip implants perform best in women, even though women make up the majority of the more than 400,000 Americans who have full or partial hip replacements each year to ease the pain and loss of mobility caused by arthritis or injuries.

"This is the first step in what has to be a much longer-term research strategy to figure out why women have worse experiences," said Diana Zuckerman, president of the nonprofit National Research Center for Women & Families. "Research in this area could save billions of dollars" and prevent patients from experiencing the pain and inconvenience of surgeries to fix hip implants that go wrong.

Researchers looked at more than 35,000 surgeries at 46 hospitals in the Kaiser Permanente health system. The research, published Monday in JAMA Internal Medicine, was funded by the U.S. Food and Drug Administration.

After an average of three years, 2.3 percent of the women and 1.9 percent of the men had undergone revision surgery to fix a problem with the original hip replacement. Problems included instability, infection, broken bones and loosening.

"There is an increased risk of failure in women compared to men," said lead author Maria Inacio, an epidemiologist at Southern California Permanente Medical Group in San Diego. "This is still a very small number of failures."

Women tend to have smaller joints and bones than men, and so they tend to need smaller artificial hips. Devices with smaller femoral heads — the ball-shaped part of the ball-and-socket joint in an artificial hip — are more likely to dislocate and require a surgical repair.

That explained some, but not all, of the difference between women and men in the study. It's not clear what else may have contributed to the gap. Co-author Dr. Monti Khatod, an orthopedic surgeon in Los Angeles, speculated that one factor may be a greater loss of bone density in women.

The failure of metal-on-metal hips was almost twice as high for women than in men. The once-popular models were promoted by manufacturers as being more durable than standard plastic or ceramic joints, but several high-profile recalls have led to a decrease in their use in recent years.

"Don't be fooled by hype about a new hip product," said Zuckerman, who wrote an accompanying commentary in the medical journal. "I would not choose the latest, greatest hip implant if I were a woman patient. ... At least if it's been for sale for a few years, there's more evidence for how well it's working."

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Online:

Journal: http://www.jamainternalmed.com

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Asian shares listless, yen firmer but near lows

TOKYO (Reuters) - Most Asian shares barely moved on Tuesday as a holiday in the U.S. overnight and a lack of catalysts kept many investors on the sidelines.

Concerns about the euro zone economy, U.S. fiscal talks and Chinese appetite limited gains in commodities and also weighed on the euro.

The dollar's strength against a basket of currencies <.dxy> also weighed on commodities and capped gains in gold.

"Markets have become top-heavy after rallying through early February on signs of economic recovery in the United States and Europe, and investors now await fresh factors to push prices higher from here," said Tomomichi Akuta, senior economist at Mitsubishi UFJ Research and Consulting in Tokyo.

"The broad sentiment is underpinned by a lack of tail risks, but investors are turning to some potentially worrying elements such as Italian elections and U.S. budget talks," he said.

The MSCI's broadest index of Asia-Pacific shares outside Japan <.miapj0000pus> was flat after briefly touching a 18-1/2-month high. The index has gained 3.5 percent this year.

Disappointing earnings pushed European shares lower on Monday for a third straight session while U.S. markets were closed for the President's Day holiday.

The risk of an inconclusive outcome in Italy's election this weekend added to concerns while investors kept eyes on Washington where policymakers are discussing a package of budget cuts set to kick in March 1, which analysts warn could hurt the economy.

"We didn't have a lead from Wall St overnight, we also had weakness coming through from European markets overnight, so we were never expecting a strong day," said Juliette Saly, stock market analyst at Commonwealth Securities in Sydney.

Australian shares <.axjo> edged up 0.1 percent as investors focused on local corporate earnings for direction after a three-month rally that has taken the market to 4-1/2 year highs.

The Nikkei stock average <.n225> eased 0.2 percent, after closing up 2.1 percent on Monday to approach its highest level since September 2008 of 11,498.42 tapped on February 6. <.t/>

Spot gold was up 0.3 percent at $1,614.01 an ounce.

London copper inched up 0.3 percent to $8,144 a tonne as Monday's three-week low drew bargain hunting given prospects for a slowly improving global economic recovery. Unease over China's limp return to the market from a week-long break held back upside momentum, however.

U.S. crude fell 0.3 percent to $95.59 a barrel while Brent inched up 0.1 percent to $117.48.

The euro was steady around $1.3344. The currency eased slightly on Monday after European Central Bank President Mario Draghi said in a speech at the European Parliament that "the exchange rate is not a policy target but is important for growth and price stability" and that its rise is "a risk."

YEN JITTERY

The yen remained near recent lows on Tuesday, as attention turned to the appointment of a new Bank of Japan governor.

The yen, which has dropped 20 percent against the dollar since mid-November, fell further at the start of the week after financial leaders from the G20 promised not to devalue their currencies to boost exports and avoided singling out Japan for any direct criticism.

The choice of the next BOJ governor and two deputies has drawn attention as a gauge of how strongly Prime Minister Shinzo Abe is committed to reflating the economy. The G20's message was that as long as Japan pursues aggressive monetary easing to achieve that goal, a weaker yen as a result of such domestic monetary policy will be tolerated, analysts say.

"But that means that some other economy's monetary conditions have been tightened," said Barclays Capital in a note.

"Japan hasn't even changed its policy stance thus far, and the effect of expectations of a looser setting have led to limited moves in domestic interest rates, but the sell-off of the JPY has been marked and has clearly caused unease in other economies," the note said.

Market reaction was muted to the release of the minutes of the BOJ's January 21-22 meeting, when the bank set a 2 percent inflation target and pledged an open-ended quantitative easing from 2014. But the yen was bought when Finance Minister Taro Aso told reporters Japan has no plans to buy foreign currency bonds as part of monetary easing, a trader said.

The dollar was down 0.2 percent to 93.73 yen, but remained near its highest since May 2010 of 94.465 hit on February 11. The euro also eased 0.3 percent to 125.05 yen, below its peak since April 2010 of 127.71 yen touched on February 6.

(Additional reporting by Maggie Lu Yueyang and Thuy Ong in Sydney; Editing by Richard Borsuk)

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The Lede: Spectacular Videos of Meteor Over Siberia

Video posted on YouTube on Friday appeared to catch an explosion caused by a meteor streaking over the Russian city of Chelyabinsk.

Last Updated, 5:40 p.m. As our colleagues Ellen Barry and Andrew Kramer report, Russians recorded video of a bright flash, apparently debris from a meteor, “streaking through the sky in western Siberia early on Friday, accompanied by a boom that damaged buildings across a vast area of territory.” Hundreds of injuries were reported, mainly from breaking glass.

The video clips, many recorded from cars on the dashboard cameras that are popular in Russia, quickly spread from social networks to Russian news sites. While it was not possible to confirm the authenticity of all of the clips posted online, several tracked closely with witness accounts and each other. (Russian speakers should be aware that some of the videos contain strong language.)

Video uploaded to YouTube on Friday was said to have been recorded over the Russian city of Chelyabinsk (although the camera’s time stamp displays an earlier date).

Video said to have been recorded on Friday in the Russian city of Chelyabinsk as a meteor passed low overhead. An explosion can be heard clearly at the seven-minute mark of the video.

Dashboard-camera footage appeared to record a meteor plunging to Earth on Friday in Russia.

A compilation of video clips posted online by Russia Today, a Kremlin-financed satellite channel.

NASA’s Jet Propulsion Laboratory reported, “The Russian fireball is the largest reported since 1908, when a fireball hit Tunguska, Siberia.”

The fireball entered the atmosphere at about 40,000 mph (18 kilometers per second). The impact time was 7:20:26 p.m. PST, or 10:20:26 p.m. EST on Feb. 14 (3:20:26 UTC on Feb. 15), and the energy released by the impact was in the hundreds of kilotons.

Based on the duration of the event, it was a very shallow entry. It was larger than the fireball over Indonesia on Oct. 8, 2009. Measurements are still coming in, and a more precise measure of the energy may be available later. The size of the object before hitting the atmosphere was about 49 feet (15 meters) and had a mass of about 7,000 tons.

Later in the day, NASA released more information about the meteor.

#RussianMeteor grazed across the atmosphere, where the meteor trail was visible for ~30 secs. The meteor was also brighter than the Sun

— NASA (@NASA) 15 Feb 13

Our colleague Henry Fountain reminds us of the vastly greater impact of what’s known as The Tunguska Event on 1908.

Several clips showed a flaming object streaking through the sky and a burst of blinding light followed by a smoke trail. One, shot by a driver named Alexander Mezentsev, showed a bright light over a city street in Chelyabinsk, a city of 1 million about 900 miles east of Moscow.

One clip, recorded on a street in Chelyabinsk, appeared to capture the chaotic aftermath of the event, as glass shattered after the shock wave and people shouted and tried to make sense of what was happening.

Video said to have been recorded in the Russian city of Chelyabinsk on Friday after a meteor passed overhead.

A very loud explosion could be heard about 25 seconds into another video, apparently recorded on a phone in the same city by a blogger named Sergey Hametov.

Video said to have been recorded on Friday in Chelyabinsk appeared to capture a loud explosion.

“There was panic. People had no idea what was happening,” Mr. Hametov told The Associated Press. “We saw a big burst of light, then went outside to see what it was and we heard a really loud, thundering sound.”

The blast, and breaking glass, was also captured about 70 seconds into another clip, which showed very clear images of the smoke trail after the meteor passed by.

Video posted on YouTube on Friday showed a smoke trail and a loud explosion after a meteor passed over Siberia.

Another video, shot from the window of a building, seemed to capture the long trail of smoke after the object passed through the sky.

Video posted on YouTube Friday appeared to show the trail of a meteor fragment in the sky.

Several clips also showed what bloggers said was the damage caused by the sonic boom.

Damage to a school in the Chelyabinsk region of Russia, said to have been caused by the sonic boom from a meteor.

Video of what was described as damage caused by the sonic boom after a meteor passed over Russia on Friday.

As Radio Free Europe/Radio Liberty reports, a blinding flash of light was captured by traffic cameras on top of buildings in Nizhny Tagil, around 220 miles north of Chelyabinsk.

A blinding flash of light was captured by Web cameras in Nizhny Tagil, north of Chelyabinsk

Another view of the meteor streaking across the sky in Nizhniy Tagil was captured on a driver’s dashboard camera.

Video of a meteor from a dashboard camera in the Russian town of Nizhniy Tagil.

Our colleague William Broad from The Times Science desk will be explaining what likely caused today’s spectacular event and answering questions on The Lede later today.

Send us your questions on the meteor strike. We’re hosting a Q&A with science writer @WilliamJBroad. Include #NYTScience

— NYT Science (@nytimesscience) 15 Feb 13

Almost immediately after the spectacular images appeared online, Russian bloggers started making comic alterations, adding aliens and President Vladimir V. Putin to the pictures.

Some of the numerous videos that quickly emerged of the incident highlighted a distinctly Russian phenomenon: the viral dashboard-cam clip. As the blogger Marina Galperina explained last year, they are commonplace in Russia partly because of the dangerous driving conditions that lead to so many accidents, and with an unreliable police force such cameras can provide valuable evidence after a crash.

The conditions of Russian roads are perilous, with insane gridlock in cities and gigantic ditches, endless swamps and severe wintry emptiness on the back roads and highways. Then there are large, lawless areas you don’t just ride into, the police with a penchant for extortion and deeply frustrated drivers who want to smash your face.

Psychopaths are abundant on Russian roads. You best not cut anyone off or undertake some other type of maneuver that might inconvenience the 200-pound, six-foot-five brawling children you see on YouTube hopping out of their SUVs with their dukes up. They will go ballistic in a snap, drive in front of you, brake suddenly, block you off, jump out and run towards your vehicle. Next thing you start getting punches in your face because your didn’t roll up your windows, or getting pulled out of the car and beaten because you didn’t lock the doors.

These fights happen all the time and you can’t really press charges. Point to your broken nose or smashed windows all you want. The Russian courts don’t like verbal claims. They do, however, like to send people to jail for battery and property destruction if there’s definite video proof.

One popular video posted on YouTube last year appeared to show just such a fight being prevented by a man facing down another driver clutching a baseball bat by pointing out that any attack on him would be recorded on his dashboard-cam.

Video of a confrontation between two Russian drivers recorded last year on a dashboard-cam.

Just last month, video recorded by a Russian driver on a dashboard-cam showed a tank suddenly cutting across a highway.

Last month, a Russian driver recorded video of a tank cutting across a highway.

The meteor that streaked across the Russian skies came from almost the opposite direction as 2012 DA14, the larger asteroid that missed Earth on Friday. That both showed up on the same day was just cosmic coincidence.

“There is no relation there,” said Paul Chodas, a scientist at NASA’s Near-Earth Object program office.

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Downton Abbey's Season 3 Finale: Shocking, Says PEOPLE's TV Critic

Downton Abbey

By Tom Gliatto

02/17/2013 at 10:00 PM EST

Downton Abbey season 3 cast

Carnival Film & Television/PBS

Downton Abbey's third season finale on PBS's Masterpiece was, to say the least, a spoiler's paradise. The episode, which saw the Granthams and servants going on holiday in the Scottish Highlands, started on a joyful note – Lady Mary was pregnant! – and ended with a shock that would have knocked the hat off Lady Violet wobbling head.

SPOLIER ALERT: Major plot points to be revealed immediately.

Cousin Matthew (Dan Stevens) died in a car accident. He was driving back to Downton, so happy he was practically whistling, just after Lady Mary (Michelle Dockery) had given birth to their son – the male Downton heir everyone has been so obsessed with since Season 1.

Many viewers probably saw this coming: For one thing, Stevens had said he was thinking of decamping before season 4 started shooting. And after the finale had its premiere broadcast in Britain in December, he blabbed all about it, including for an interview posted online by The New York Times.

Even so, the death was almost sadistically abrupt and arbitrary, especially after the soft tenderness and growing love between Mary and Matthew in recent episodes. Now we saw dead poor Matthew dumped on the cold mossy ground, eyes wide open.

You can never be sure Downton writer-creator Julian Fellowes won't pull some shameless stunt to kick-start a story – in season 2 Matthew, paralyzed during the war, suddenly leaped out of his wheelchair – but he seemed to want us to be sure that Matthew was 100% gone. I wouldn't have been surprised if the car backed over the corpse.

So ended a terribly sad season of Downton.

We already suffered the loss in childbirth of Lady Sybil (Jessica Brown Findlay). Her deathbed scene was unflinching and deeply moving as she gasped for breath and called for help. Her poor mother (Elizabeth McGovern) sobbed in despair, and the doctors couldn't agree on what to do.

Millions of viewers cried, too, and sighed for a long time afterward. Those who didn't are probably evil.

That scene was the heart of the season: Sybil was so beautiful and kind and gracious and spirited, and so different from her fractious sisters. It was if one were to discover a rare, transcendent soul among the Kardashians. Her death robbed the show of a lovely presence, and also brought out the best moments yet from McGovern and Maggie Smith, as Lady Violet.

It never ceases to annoy me, to be honest, that Lady Violet's feeble witticisms are treated as if they were Oscar Wilde one-liners on loan, like Harry Winston jewels. If you want real witticisms, try any contemporary American sitcom, including FX's Archer.

But this season, as Violet grieved, we saw how much depth Smith can invest in a single moment. At one point in the finale, she looked up as dinner was announced, and in her enormous eyes you saw a woman who wished she could just chuck the whole damn thing and dwell on her memories.

I wish I could say I will miss Matthew, but all in all an unattached Lady Mary is better than a married one. She was never sexier than in the first season, when she sneaked off to bed with velvety, sensual Mr. Pamuk, who unfortunately kicked the bucket while they made love.

Mary is a wonderful creation – the show's most original, complex character – capable of bouncing from romance to sorrow to sarcasm. You could say her love for Matthew transformed her, but it also had the potential to dull her.

Matthew was blandly handsome and good and patient and full of improving notions, but not terribly exciting. He was like a Bachelor from a much earlier period.

There isn't much else to say about the finale. Fellowes worked through a number of plots with his usual tangy glibness. The performances were all delightful, tart, full of emotion, humor and regret.

For now, we can look forward to Lady Mary at her most beautiful, because most woeful, in season 4.

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Study: Better TV might improve kids' behavior

SEATTLE (AP) — Teaching parents to switch channels from violent shows to educational TV can improve preschoolers' behavior, even without getting them to watch less, a study found.

The results were modest and faded over time, but may hold promise for finding ways to help young children avoid aggressive, violent behavior, the study authors and other doctors said.

"It's not just about turning off the television. It's about changing the channel. What children watch is as important as how much they watch," said lead author Dr. Dimitri Christakis, a pediatrician and researcher at Seattle Children's Research Institute.

The research was to be published online Monday by the journal Pediatrics.

The study involved 565 Seattle parents, who periodically filled out TV-watching diaries and questionnaires measuring their child's behavior.

Half were coached for six months on getting their 3-to-5-year-old kids to watch shows like "Sesame Street" and "Dora the Explorer" rather than more violent programs like "Power Rangers." The results were compared with kids whose parents who got advice on healthy eating instead.

At six months, children in both groups showed improved behavior, but there was a little bit more improvement in the group that was coached on their TV watching.

By one year, there was no meaningful difference between the two groups overall. Low-income boys appeared to get the most short-term benefit.

"That's important because they are at the greatest risk, both for being perpetrators of aggression in real life, but also being victims of aggression," Christakis said.

The study has some flaws. The parents weren't told the purpose of the study, but the authors concede they probably figured it out and that might have affected the results.

Before the study, the children averaged about 1½ hours of TV, video and computer game watching a day, with violent content making up about a quarter of that time. By the end of the study, that increased by up to 10 minutes. Those in the TV coaching group increased their time with positive shows; the healthy eating group watched more violent TV.

Nancy Jensen, who took part with her now 6-year-old daughter, said the study was a wake-up call.

"I didn't realize how much Elizabeth was watching and how much she was watching on her own," she said.

Jensen said her daughter's behavior improved after making changes, and she continues to control what Elizabeth and her 2-year-old brother, Joe, watch. She also decided to replace most of Elizabeth's TV time with games, art and outdoor fun.

During a recent visit to their Seattle home, the children seemed more interested in playing with blocks and running around outside than watching TV.

Another researcher who was not involved in this study but also focuses his work on kids and television commended Christakis for taking a look at the influence of positive TV programs, instead of focusing on the impact of violent TV.

"I think it's fabulous that people are looking on the positive side. Because no one's going to stop watching TV, we have to have viable alternatives for kids," said Dr. Michael Rich, director of the Center on Media and Child Health at Children's Hospital Boston.

____

Online:

Pediatrics: http://www.pediatrics.org

___

Contact AP Writer Donna Blankinship through Twitter (at)dgblankinship

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Japan stocks rally to near four-year highs, yen resumes fall after G20

TOKYO (Reuters) - Japanese shares surged 2.1 percent on Monday and were on the brink of revisiting four-year highs tapped recently, as the yen slumped after Tokyo dodged direct criticism from G20 peers on its aggressive reflation plans that have weakened the currency.

The G20 opted not to single out Tokyo, but committed members to refrain from competitive devaluations and said monetary policy would be directed only at price stability and growth. Japan said this decision is a green light to pursue its expansionary policies.

The market's focus is now on Prime Minister Shinzo Abe's nominee for the next Bank of Japan governor. Abe is expected to announce his choice in coming days.

Sources told Reuters on Friday that former top financial bureaucrat Toshiro Muto is leading the field of candidates to govern the bank. He may intensify stimulus efforts to energise the economy but might not pursue unconventional easing measures.

"The G20 basically gave tacit approval for currency weakening as a result of monetary easing, and not intervention. So that puts focus on what the BOJ will do next. As long as the BOJ shows its seriousness about stamping out deflation, the yen's decline will likely be tolerated," said Citibank Japan chief FX strategist Osamu Takashima.

The dollar gained 0.5 percent to 93.97 yen inching closer to its highest since May 2010 of 94.465 hit on February 11. The euro added 0.3 percent to 125.34 yen, still below its peak since April 2010 of 127.71 yen touched on February 6.

The Nikkei average <.n225> closed up 2.1 percent as exporters and banks led the pack on the softening yen, after surging as much 2.4 percent earlier to come close to its highest level since September 2008 of 11,498.42 tapped on February 6. <.t/>

"The G20 effect is already seen in Abe's general comments on forex today which steered away from giving specifics on a preferred level or direction for the yen," said Yunosuke Ikeda, a senior FX strategist at Nomura Securities.

Abe said on Monday that the BOJ's monetary easing is aimed at beating deflation, not at manipulating the forex market and weakening the yen, and said correcting excessive yen rises would be an appropriate policy direction. Previously, Japanese officials have noted that the current yen selling was a correction to the past excessive yen strength.

The yen's weakness weighed on emerging Asian currencies while South Korean shares <.ks11> eased 0.3 percent on concerns about the eroding competitive edge for the country's exporters.

Japan will keep pursuing its current policy, said Yuna Park, a currency and bond analyst at Dongbu Securities in Seoul. "The rest of Asia will not just wait and see. That will put more pressure on Asian currencies," he said.

A weaker yen would make other currencies relatively stronger against the dollar and fuel speculation that other Asian countries could step in to curb the strength of their currencies, Nomura's Ikeda said.

The MSCI's broadest index of Asia-Pacific shares outside Japan <.miapj0000pus> paused, after moving in a narrow range. The pan-Asian index briefly hit a 18-1/2-month high on Friday and had its best performance since the week of January 6 with a 1.2 percent weekly gain.

Australian shares led the pan-Asian index with a 0.6 percent rise as a string of earnings reports supported a view that the local economy was in better-than-expected shape.

Markets in China and Taiwan resumed trading after a week-long holiday.

Indonesian stocks <.jkse> inched up 0.1 percent after setting a record high for a fifth straight session on Friday, while shares in Thailand <.seti> were up 0.2 percent as the country's economy grew a robust 3.6 percent in the fourth quarter from the previous three months.

European markets may track lower, with financial spreadbetters predicting London's FTSE 100 <.ftse>, Paris's CAC-40 <.fchi> and Frankfurt's DAX <.gdaxi> would open down 0.1 percent. U.S. stock futures were barely changed. U.S. markets will be closed on Monday for the President's Day holiday. <.l><.eu><.n/>

STOCKS CONSOLIDATE

Data from EPFR Global on Friday underscored that a consolidation was underway in global equities after their recent rally. It showed investors worldwide pulled $3.62 billion from U.S. stock funds in the latest week, the most in ten weeks after taking a neutral stance the prior week. But demand for emerging market equities remained strong, with investors putting $1.81 billion in new cash into stock funds, the fund-tracking firm said.

Commodities markets awaited clues on demand from China, the top consumer.

"China's overall economy is still strong, so the appetite for base metals after Chinese New Year will gradually pick up," said Helen Lau, senior commodity analyst at UOB-Kay Hian in Hong Kong.

London copper fell 0.4 percent to $8,170 a tonne as traders played catch up after a week-long holiday in China, with worries about the euro zone economy weighing on sentiment.

U.S. crude fell 0.2 percent to $95.68 a barrel but Brent inched up 0.1 percent to $117.82.

Gold rebounded from a six-month low on bargain hunting and as jewellers in China returned to the physical market after the Lunar New Year holiday.

(Additional reporting by Jongwoo Cheon; and Melanie Burton in Singapore; Editing by Shri Navaratnam and Eric Meijer)

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Dismissed as Doomsayers, Advocates for Meteor Detection Feel Vindicated

For decades, scientists have been on the lookout for killer objects from outer space that could devastate the planet. But warnings that they lacked the tools to detect the most serious threats were largely ignored, even as skeptics mocked the worriers as Chicken Littles.

Jim Watson/Agence France-Presse — Getty Images

Dr. Edward Lu, a former NASA astronaut and Google executive, has warned about space threats.

No more. The meteor that rattled Siberia on Friday, injuring hundreds of people and traumatizing thousands, has suddenly brought new life to efforts to deploy adequate detection tools, in particular a space telescope that would scan the solar system for dangers.

A group of young Silicon Valley entrepreneurs who helped build thriving companies like eBay, Google and Facebook has already put millions of dollars into the effort and saw Friday’s shock wave as a turning point in raising hundreds of millions more.

“Wouldn’t it be silly if we got wiped out because we weren’t looking?” said Edward Lu, a former NASA astronaut and Google executive who leads the detection effort. “This is a wake-up call from space. We’ve got to pay attention to what’s out there.”

Astronomers know of no asteroids or comets that pose a major threat to the planet. But NASA estimates that fewer than 10 percent of the big dangers have been discovered.

Dr. Lu’s group, called the B612 Foundation after the imaginary asteroid on which the Little Prince lived, is one team of several pursuing ways to ward off extraterrestrial threats. NASA is another, and other private groups are emerging, like Planetary Resources, which wants not only to identify asteroids near Earth but also to mine them.

“Our job is to be the first line of defense, and we take that very seriously,” James Green, the director of planetary science at NASA headquarters, said in an interview Friday after the Russian strike. “No one living on this planet has ever before been hurt. That’s historic.”

Dr. Green added that the Russian episode was sure to energize the field and that an even analysis of the meteor’s remains could help reveal clues about future threats.

“Our scientists are excited,” he said. “Russian planetary scientists are already collecting meteorites from this event.”

The slow awakening to the danger began long ago, as scientists found hundreds of rocky scars indicating that cosmic intruders had periodically reshaped the planet.

The discoveries included not just obvious features like Meteor Crater in Arizona, but wide zones of upheaval. A crater more than a hundred miles wide beneath the Yucatán Peninsula in Mexico suggested that, 65 million years ago, a speeding rock from outer space had raised enough planetary mayhem to end the reign of the dinosaurs.

Some people remain skeptical of the cosmic threat and are glad for taxpayer money to go toward urgent problems on Earth rather than outer space. But many scientists who have examined the issues have become convinced that better precautions are warranted in much the same way that homeowners buy insurance for unlikely events that can result in severe damage to life and property.

Starting in the 1980s and 1990s, astronomers turned their telescopes on the sky with increasing vigor to look for killer rocks. The rationale was statistical. They knew about a number of near misses and calculated that many other rocky threats whirling about the solar system had gone undetected.

In 1996, with little fanfare, the Air Force also began scanning the skies for speeding rocks, giving credibility to an activity once seen as reserved for doomsday enthusiasts. It was the world’s first known government search.

The National Aeronautics and Space Administration took a lead role with what it called the Spaceguard Survey. In 2007, it issued a report estimating that 20,000 asteroids and comets orbited close enough to the planet to deliver blows that could destroy cities or even end all life. Today, with limited financing, NASA supports modest telescopes in the southwestern United States and in Hawaii that make more than 95 percent of the discoveries of the objects coming near the Earth.

Scientists lobbied hard for a space telescope that would get high above the distorting effects of the Earth’s atmosphere. It would orbit the Sun, peering across the solar system, and would have a much better chance of finding large space rocks.

But with the nation immersed in two wars and other earthly priorities, the government financing never materialized. Last year, Dr. Lu, who left the NASA astronaut corps in 2007 to work for Google, joined with veterans of the space program and Silicon Valley entrepreneurs to accelerate the asteroid hunt.

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Beyoncé's Life Is But a Dream: The Best Moments

TV Watch

By Aaron Parsley

02/16/2013 at 11:05 PM EST

I am ... still singing!

Beyoncé's HBO documentary, Life Is But a Dream, aired Saturday night and it was a 90-minute whirlwind of music, dance and emotion. And though the singer, 31, has been everywhere recently (the Inauguration, the Super Bowl halftime show, Oprah's Next Chapter), the film was full of new and exciting moments. Here are my favorites:

Baby Bey: A home movie of Beyoncé as a little girl playing with bees made my jaw drop. The scene seems to prove what her fans believe: that she was born to be a superstar known as Queen B. I also loved seeing her singing – and being a typical, giggling teenager – with her sister Solange and Kelly Rowland.

The Heartbreak: From her frank discussion of firing her father as a manager to hearing "the saddest song" she's ever written after having miscarriage, the film – which Beyoncé produced and directed herself – had raw, emotional moments.

Mrs. Carter: Life is like a dream for Beyoncé and husband Jay-Z, who surprisingly shared intimate moments together – giddy over her pregnancy, singing Coldplay's "Yellow" to each other, enjoying solitude on a boat in an undisclosed, exotic location. You could feel the love when she toasted him on his birthday.

Blue Ivy: How cute is she?! When Beyoncé and Jay's baby girl, who turned 1 in January, appeared on the screen at the premiere of Life Is But a Dream at New York's Ziegfeld Theater, the crowd gasped and then let out a collective "aww." And I jammed my fingers on the TV screen the first time I watched, trying to pinch those cheeks. Seeing Beyoncé at home with a baby on her hip was a powerful reminder that the fierce superstar is human afterall.

The Music: Of course! Seeing her sing "Listen" with a gorgeously altered ending in a car convinced me of one thing: Beyoncé is definitely not human! I also loved seeing everything that went into her epic Billboard Music Awards performance of "Run the World (Girls)." I just wish I could do that dance. And is it me or does "Resentment" get grittier and angrier every time she performs it?

Praise Beysus and long live the Queen B!

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UN warns risk of hepatitis E in S. Sudan grows

GENEVA (AP) — The United Nations says an outbreak of hepatitis E has killed 111 refugees in camps in South Sudan since July, and has become endemic in the region.

U.N. refugee agency spokesman Adrian Edwards says the influx of people to the camps from neighboring Sudan is believed to be one of the factors in the rapid spread of the contagious, life-threatening inflammatory viral disease of the liver.

Edwards said Friday that the camps have been hit by 6,017 cases of hepatitis E, which is spread through contaminated food and water.

He says the largest number of cases and suspected cases is in the Yusuf Batil camp in Upper Nile state, which houses 37,229 refugees fleeing fighting between rebels and the Sudanese government.

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After decent rally, perhaps time for a pause

NEW YORK (Reuters) - Stocks could struggle to extend their seven-week winning streak as the quarterly earnings period draws to a close and the market bumps into strong technical resistance.

Many analysts say the market could spend the next few weeks consolidating gains that have lifted the benchmark Standard & Poor's 500 <.spx> by 6.6 percent since the start of the year.

The S&P 500 ended up 0.1 percent for the week, recovering from a late sell-off on Friday after a Bloomberg report about slow February sales at Wal-Mart triggered a slide in the retailer's shares. It was the index's seventh week of gains.

Odds of a pullback are increasing, with the market in slightly overbought territory, said Bruce Zaro, chief technical strategist at Delta Global Asset Management in Boston.

"I do suspect the closing of the earnings season will lead to at least a pause and possibly a pullback," Zaro said. The S&P 500 could shave 3 to 5 percent between now and early April, he said.

Fourth-quarter earnings have mostly beaten expectations. Year-over-year profit growth for S&P 500 companies is now estimated at 5.6 percent, up from a January 1 forecast for 2.9 percent growth, and 70 percent of companies are exceeding analyst profit expectations, above the 62 percent long-term average, according to Thomson Reuters data.

On Thursday, Wal-Mart, the world's largest retailer, is due to report results, unofficially closing out the earnings period. Investors will be keen to see its quarterly numbers, especially after the Friday's news report that rattled investors.

The S&P 500 has gained 4.3 percent since Alcoa kicked off the earnings season on January 8.

The approaching March 1 deadline for across-the-board federal budget cuts unless Congress reaches a compromise adds another reason for caution, especially with recent economic data indicating the recovery remains bumpy.

Manufacturing output fell 0.4 percent last month, the Federal Reserve said on Friday, but production in November and December was much stronger than previously thought.

TESTING RESISTANCE

The S&P 500 has been trading near five-year highs, and it notched its highest level since November 2007 this week. But the gains have pushed the benchmark index almost as far as it is likely to go in the near term, with strong resistance hovering around 1,525 and 1,540, one analyst said.

As a result, the index is set to move sideways, said Dave Chojnacki, market technician at Street One Financial in Huntington Valley, Pennsylvania. "We just don't have the volume or the catalyst right now" to go above those levels, he said.

At the same time, other analysts say, the market has not shown significant signs of slowing, including a break below 15- and 30-day moving averages.

Such moves would be needed to show that momentum is slowing or that the market is at risk of a correction, said Todd Salamone, director of research for Schaeffer's Investment Research in Cincinnati, Ohio. The S&P 500's 14-day moving average is at 1,511 while the 30-day is at 1,494. The index closed Friday at 1,519.

Recent M&A activity, including news this week of a merger between American Airlines and US Airways Group , helped provide some strength for the market this week and optimism that more deals may be on the way.

In the coming days, the market will focus on minutes from the latest Federal Reserve meeting, due to be released on Wednesday, which could provide support if they suggest the Fed will remain on its current course of aggressive monetary easing.

The Fed minutes released in January spooked markets a bit when they revealed that some Fed officials thought it would be appropriate to consider ending asset purchases later in 2013. U.S. Treasury yields rose on that news, though market worries about a near-term end to quantitative easing have since faded.

Among other companies expected to report earnings next week are Nordstrom , Hewlett-Packard and Marriott International

(Reporting By Caroline Valetkevitch; Editing by Leslie Adler)

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