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The stage appears to be set for a renewed debate about gun control. The NRA and other proponents of gun owners' rights have been silent in the aftermath of the Newtown shootings, but many will question the benefits of possible restrictions.

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.

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.

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.

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."

Hardly anyone in the U.S. took Newt Gingrich seriously when he suggested committing American resources to a moon colony, but Foreign Policy's John Hickman says across the Pacific they don't think the idea's so outlandish.

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.

Shopping for wild-caught fish can be ethically fraught for sustainability-minded consumers, because some fishing methods can result in large amounts of bycatch: the dolphins, seals and other marine life that can get snared and killed in the process.

Food writer Julia della Croce got quite a surprise when she discovered a purple variety of sweet potato at the market — and her signature Italian dumplings got a kick of color.

About 75,000 patients a year die from infections they caught in the hospital. A Kaiser Health News analysis finds that nearly 700 hospitals across the nation have higher than expected infection rates.