Trinity Test, July 16, 1945, Nagasaki, August 9, 1945, Einstein sends letter warning FDR Germany might make atomic weapon, August 2, 1939, Manhattan Project begins, 1942, Hiroshima, August 6, 1945, Becquerel discovers radioactivity, 1896, Pearl Harbor, December 7th, 1941, Nuclear Fission, December 1938, Scientific Discoveries, 1896-1938, End of the war, September 1945, First controlled chain reaction, December 2, 1942

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