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Researched1942-1945 · Machine Age (1900 – 1945)

Formal Sciences & Matter / Physics

Manhattan Project

The US-led wartime programme (1942-45) built the first nuclear weapons, tested on 16 July 1945 and used in August on Hiroshima and Nagasaki.

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At its peak it employed about 125,000 people at Los Alamos, Oak Ridge and Hanford with British and Canadian partners; it was the first giant state-funded science and engineering effort. It shaped postwar science policy, national laboratories, nuclear power and arms control, and left a lasting debate about science and war.

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