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'Fat Man' was the codename for the type of atomic bomb that was detonated over the Japanese city of Nagasaki by the United States on 9 August 1945. It was the second of the only two nuclear weapons ever used in warfare, the first being 'Little Boy', and its detonation marked the third ever man-made nuclear explosion in history.<br/><br/> It was built by scientists and engineers at Los Alamos Laboratory using plutonium from the Hanford Site and dropped from the Boeing B-29 Superfortress Bockscar.
The United States, with the consent of the United Kingdom as laid down in the Quebec Agreement, dropped nuclear weapons on the Japanese cities of Hiroshima and Nagasaki in August 1945, during the final stage of World War II.<br/><br/> The two bombings, which killed at least 129,000 people, remain the only use of nuclear weapons for warfare in history.