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Forty-Three Seconds to Hiroshima

What Actually Happened Inside Little Boy

Introduction The uranium bomb dropped on Hiroshima on August 6, 1945, is frequently described as the “simple” atomic bomb. Nearly every history of the Manhattan Project explains that Little Boy used a gun-type design in which one subcritical mass of uranium-235 was fired into another to produce a supercritical assembly. Because this basic principle appears […]

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