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The Defense Department has spent close to $3 billion since 2007 to treat and study traumatic brain injuries and post traumatic stress disorder. But a federal investigation finds that it's difficult to figure out how the money's been spent.

Men were much more likely to have an oral HPV infection than women. And people who have had more sex partners and more frequent sex were more likely to be positive for HPV.

A 33,000-year-old skull of a "wolf on the way to becoming a dog" was found in a Siberian cave. Evolutionary Biologist Susan Crockford, co-author of a study about the skull in PLoS ONE, discusses why the discovery challenges common beliefs about dog domestication.

The move isn't as severe as the one taken earlier this month by S&P, because it leaves France's rating intact. The credit of Italy and Spain, however, was knocked down two notches.

The company is "looking at a deal that would value the social network between $75 billion to $100 billion," according to "people familiar with the matter."

In his book, Reinventing Discovery: The New Era of Networked Science, Physicist Michael Nielsen discusses why scientists jealously guard their data and are slow to adopt online tools for collaboration. Nielsen talks about why attempts to create science wikipedias have failed.

Coming so soon after the death of freestyle skier Sarah Burke following a training accident, 22-year-old snowmobile freestyler Colten Moore's crash may make you shudder. But rest assured, he wasn't seriously injured — and went on to win the event.

Newt Gingrich laid out his case for an activist policy in Latin America, while Mitt Romney spoke warmly about the prospect of statehood for Puerto Rico.

Google already offers a way to pay for lunch or groceries using its "Google Wallet" on an Android phone — cell providers and banks aren't far behind with payment systems of their own. Analyst Gilles Ubaghs talks about how coupons and convenience might persuade customers to make the switch.

A conductor's (literally) bruising battle, a dead fish and much more in all the news that's fit to link.