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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,

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.

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.

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.

The bidding period has closed for the companies hoping to design and deliver the president's signature campaign promise. Here's a glimpse of some proposals — from wire mesh to 30-foot pipe organs.

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.

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.

The president's campaign may be raising lots of money off impeachment, but it may not be firing up rural voters as Republicans anticipated. We talk about that and six other lessons from the elections.

Retirement benefits are being cut at every level, both in the U.S. and in Europe. Economic and demographic pressures may have made cuts inevitable, but they are generating strong opposition.

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.