Nuclear testing: Why did it stop, why test and who has nuclear weapons?
Russia held nuclear drills last week and has tested a nuclear-powered cruise missile and a nuclear-powered torpedo but has not tested a nuclear warhead
A mushroom cloud rises with ships below during Operation Crossroads nuclear weapons test on Bikini Atoll, Marshall Islands in this 1946 handout provided by the US Library of Congress.(photo credit: REUTERS/U.S. Library of Congress/Handout via Reuters)ByREUTERSUpdated:
