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Fat Man, the implosion-type nuclear weapon detonated over Nagasaki, Japan, on August 9, 1945, was the recipient of Seaborg's plutonium extraction process. Seaborg's innovative techniques enabled the efficient separation of plutonium from uranium, a crucial step in assembling the Fat Man device. Without Seaborg's contributions, the timely production and deployment of this weapon may have been hindered, shaping the course of World War II and its aftermath.