We turned the switch, saw the flashes, watched for ten minutes, then switched everything off and went home. That night I knew the world was headed for sorrow. — Leo Szilard, describing the 1939 experiment which confirmed that the atom could be split.

We turned the switch, saw the flashes, watched for ten minutes, then switched everything off and went home. That night I knew the world was headed for sorrow. — Leo Szilard, describing the 1939 experiment which confirmed that the atom could be split.