Researchers looking for volunteers willing to be infected with Zika virus
This winter, when mosquitoes aren’t biting, researchers are planning a study to help speed development of much-needed Zika vaccines
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This winter, when mosquitoes aren’t biting, researchers are planning a study to help speed development of much-needed Zika vaccines
An internal United Nations document says a senior politician appointed by President Salva Kiir led the recruitment of an entire village of boys using intimidation
The athletes’ kindness to each other has been a big hit on social media -- and a reminder of Olympic spirit
At 38, she is the oldest female medal winner in beach volleyball history; she added bronze in Rio to her three gold medals from previous Olympics
Little boy has become the face of Syria’s civil war, which has claimed the lives of more than 400,000 people, 41,000 of them children
Researchers say there is ample evidence that cholera was introduced to Haiti’s biggest river in October 2010 by inadequately treated sewage from a U.N. peacekeeping base
U.S. officials still deny the payment was ransom, since the money was owed for 35 years; Republicans are crying foul
Authorities dispute Ryan Lochte's story of being robbed; but they do say swimmers were confronted by security guard with a gun; 2 swimmers have checked into flight leaving Brazil
The social media giant has deactivated the accounts over the last six months
Brazil police official gives new details on American swimmer's story about being robbed at gunpoint in Rio de Janeiro
In historic night, U.S. athletes sweep gold, silver and bronze in hurdles, also capture medals in long jump, 200-meter
Brazil authorities take action amid increasing tension with American swimmers over ever-changing account of robbery
Opposition groups released photo of 5-year-old to remind world of civilians' plight in civil war, and it quickly went viral
Thousands of photos have been taken during the Summer Games, inspiring the world through snapshots of competition, triumph and heartbreak
USOC says swimmers were removed amid probe of purported robbery involving them, Ryan Lochte and another teammate; all but Lochte expected to talk to Brazilian authorities Thursday