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For two years, the zoo said Luka was a male when the bear was really a female. The zoo explained that it's difficult to identify the sex of juvenile Andean bears.

The Texas Republican's early focus will reportedly be fundraising and the caucuses. He faces what's likely to be a crowded Republican field for the 2016 presidential nomination.

The French capital last week briefly dethroned New Delhi and Beijing as the world's most polluted city, according to one company that measures air quality.

Britain reportedly has withdrawn its remaining special forces, days after a similar U.S. move, in response to the worsening security that the U.N. envoy for Yemen described as the "edge of civil war."

The Texas senator is looking for a boost, as he trails other GOP presidential hopefuls. So he took the bold move of becoming the first to officially declare his candidacy.

Texas Sen. Ted Cruz became the first major candidate to declare for president, but some question whether he's eligible since he was born in Canada. Legal scholars, though, believe he can.

Without a doubt, the Internet in Cuba is tough. The politics are thorny; getting it is difficult. But there are signs that change is on the horizon.

A review of the city's 394 officer-involved shootings between 2007 and 2014 also found police recruits were not trained in a "systematic and modular fashion."

Many older people are taking a lot of meds, and some drugs may not be doing them much good. When terminally ill people went off statins, they said they felt better. And it didn't increase their risk.

Medical researchers have made only modest progress treating the most common cancers since the war on cancer was declared in 1971. The disease has proved far more complicated than doctors had hoped.