U.S. officials are investigating claims circulated on social media sites that an American fighting with Syria's rebels helped carry out a suicide truck bombing in the war-torn country over the weekend.
American leadership in the 21st century will be defined in part by the nation's military strength, "but only in part," President Obama said in a wide-ranging interview with NPR about his foreign policy priorities.
Echoing themes he expressed during a speech Wednesday to West Point graduates, Obama emphasized the importance of international norms and alliances in addressing challenges such as Russia, China and Syria.
There's new evidence that an oral cholera vaccine might help stop an epidemic in its tracks.
That's the encouraging message from a study that tested a two-dose vaccine during a 2012 outbreak in Guinea. The virus was 86 percent effective in preventing immediate infection of a scourge that afflicts up to five million people a year and kills around 120,000.