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Shavings of metal can flake off of the artificial joints and cause serious pain and medical problems in the hip. About a half-million Americans have this type of implant, and though most patients won't have a problem, one doctor called the failure rate "unacceptably high."

One of the defining elements of the 2012 presidential campaign is money. Two dozen wealthy Americans have put in at least $1 million each. And one of the biggest donors is Sheldon Adelson, the casino magnate who has almost single-handedly kept Newt Gingrich's campaign afloat.

When a Mumbai hotel was besieged by terrorists in 2008, something extraordinary happened: Workers didn't flee. They stayed behind to help save guests at the risk of their own lives. What could possibly explain it? A new study attempts to answer that question.

Drones are no longer the sole province of the U.S. military and intelligence agencies. They are starting to appear in U.S. skies. Police are employing them to fight crime. Enthusiasts are making their own at home. Rules governing their use are changing, and civil liberties groups are calling for privacy restrictions.

Job growth was weak — yet another sign that the sluggish economy continues to struggle to produce jobs.

In Boston, scientists are predicting that climate change will lead to dramatic sea level rise, and more frequent flooding, around the city. Officials are studying the potential impact on roads and sewers and are asking waterfront developers to plan for increased flooding.

The Great Recession hit the industrial Midwest especially hard in recent years. Now, though, local leaders in at least one small Illinois city believe the worst is finally behind them. But they need to diversify — and attract new residents.

The debate may be remembered for Mitt Romney's $10,000 gaffe and Newt Gingrich's failure to implode. Gingrich, the front-runner in national and many state polls, didn't make any obvious errors. He also weathered the criticisms that came his way because of his current role as pace-setter in the polls.

Facebook could be facing its biggest scandal yet as a former employee comes forward to expose some of the company's secrets.

Fiona Hill was a key witness at Donald Trump's first impeachment hearing. Now she's warning about the threat to American democracy that comes from within. Her memoir is There Is Nothing for You Here.