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  Timeline of the Nuclear Age 1940s  1943


Construction begins on The Hanford Site, where plutonium production began in the Manhattan Project. The site currently holds 2/3 of the U.S.ís high-level radioactive waste.

Thirty scientists assemble at Los Alamos, New Mexico for an introductory series of lectures on the theory and practicalities of designing and building an atomic bomb using uranium-235 or plutonium-239.

The Military Policy Committee of the Manhattan Project develops the idea to use the atomic bomb on Japan rather than on Germany. The committee is chaired by General Leslie Groves