Video: 'The World At War 1973(World War II Documentary)Episode 24-The Bomb(February–September 1945)' (Apr. 25, 1945, at 10:11)

(Wednesday, April 25, 1945, 12 noon EWT; during World War II) — U.S. Secretary of War Henry Stimson briefed President Harry Truman today about the possibility of an atomic weapon, outlined the history and status of the program and predicted that “within four months we shall in all probability have completed the most terrible weapon ever known in human history” (click here for a clip of this day on “American Experience: Truman” at 1:41:54).

Video: 'Peter Jennings - Hiroshima: Why the Bomb was Dropped (1995)' (Apr. 25, 1945, 11:14)