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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.

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.

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.

Females make up less than 30 percent of the the country's labor force. But one nonprofit is providing restaurant and cooking training to vulnerable women who have been shut out by Moroccan society.

Sakshi Satpathy, 16, babysat and walked dogs to finance her films on child marriage and trafficking. She's won the Girl Scout's top honor — and Amnesty International and CARE have screened her works.

Airstrikes have helped push back the Islamic State in some places, but the group has gained in other areas. Pentagon officials say the U.S. operation may need another two years or more to succeed.

A new study by three media scholars reveals how the social protest movement spread on Twitter, with some fascinating — and sobering — findings.