URUMQI, China, July 7 -- Clashes between Muslim Uighur protesters and security forces have killed at least 156 people in China's far west, state media said Monday, in what appears to be one of this country's bloodiest outbreaks of violence in recent history.

MOSCOW, July 6 -- President Obama and Russian President Dmitry Medvedev reached a preliminary agreement Monday to cut the American and Russian nuclear arsenals by as much as a third while exploring options for cooperation on missile defense.

Hundreds of embryonic stem cell lines, whose use in the United States had effectively been curtailed by the Bush administration, can be used to study disorders and develop cures if researchers can show the cells were derived using ethical procedures, according to new rules issued by the federal...

They didn't even make it to the Bay Bridge before the argument started.

Robert S. McNamara, 93, the former secretary of defense whose record as a leading executive of industry and chieftain of foreign financial aid was all but erased from public memory by his reputation as the primary architect of U.S. involvement in the war in Vietnam, died yesterday at his home in...