Discusses the Manhattan Project of the United States which worked on developing nuclear weapons during World War II. It led to the two atomic bombs that were dropped on Japan in August 1945, ending the war with Japan.

Looks at the nuclear arms race in the 1950s as the United States and the USSR both stockpiled nuclear weapons. Includes 1951 propaganda video showing schoolchildren how to 'Duck and Cover' in the event of a nuclear attack. [9:15]