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Former Vice President Biden announced Thursday that he will run for president. The 76-year-old former Delaware senator immediately becomes a top contender vying for the Democratic nomination,

They were talented, idealistic risk-takers on the road to what they thought would be important medical discoveries. But when the funding for risk-takers dried up, these two academics called it quits.

Xinjiang has nearly 20,000 glaciers, half of China's total. They're all receding at a record pace — and will continue to melt, some scientists warn, even if global temperatures stop rising.

Thirty-two years after a deadly earthquake, a magnitude 7.1 temblor rattled Mexico City and surrounding areas. Residents had marked the anniversary of the 1985 quake earlier in the day with drills.

Donald Trump named a conservative media provocateur to lead his campaign — in the third major shakeup during the election season. David Greene talks to senior Trump adviser Boris Epshteyn.

A CDC advisory panel concluded the nasal spray vaccine is so ineffective that it shouldn't be used by anyone during the 2016-2017 flu season. Until 2015, the spray was the top choice for kids.

Amazon is working on a whittled-down list of cities where it might build the second headquarters. Among the bidders, Washington, D.C., stands out for competing against two of its next-door neighbors.

The results represent a major shift in the Latin American country's presidential politics that conservatives and moderates had long dominated.

You'd be hard-pressed to find two Republican incumbents who drew more of Donald Trump's ire than Georgia Gov. Brian Kemp and Georgia Secretary of State Brad Raffensperger. Both won big on Tuesday.

U.S. Secretary of State Antony Blinken arrived in Beijing early Sunday on a high-stakes diplomatic mission to try to cool exploding U.S.-China tensions that have set many around the world on edge.