Atomic bomb
An atomic bomb is a nuclear weapon whose explosive energy comes from a chain reaction of nuclear fission in uranium or plutonium. It is distinct from a hydrogen bomb, which primarily uses nuclear fusion.
On August 9, 1945, atomic bomb Fat Man's primary target was Kokura, not Nagasaki. Smoke and clouds obscured the target through 50 minutes and three failed runs. With fuel critically low, the B-29 Bockscar diverted to Nagasaki, its secondary target.
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Yamaguchi Tsutomu survived both Atomic bombs dropped on Hiroshima and Nagasaki. After the first blast, he returned to Nagasaki and went to work. His boss scolded him — "a single bomb can't destroy a city" — and at that exact moment, the second atomic bomb detonated.
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