science · 25 April 1945 · 79 years ago
In 1945, the new U.S. President, Harry S. Truman was briefed on the status of the atomic bomb project. Within 24 hours of Roosevelt's death on 12 Apr 1945, Truman had been told briefly about the atomic bomb project by Secretary of War, Henry Stimson. In this more extensive briefing on 25 Apr, Stimson, with General Groves's assistance, gave Truman information that the uranium-235 gun design had been frozen, but sufficient uranium-235 would not be accumulated until around 1 Aug. Enough plutonium-239 would be available for an implosion assembly to be tested in early July; a second would be ready in August. eb
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