
In the closing days of World War II, scientists working for the U.S. government invented nuclear explosives by splitting the atoms of heavy metals. Germany had already surrendered, but the United States and its allies remained at war with Japan. In the summer of 1945, the...

Since the bombings of Hiroshima and Nagasaki, tens of thousands of nuclear weapons manufactured by governments around the world. None have been used so far, and the absence of nuclear war among armed nations is a mystery. Caplow considers this and other questions in his study...