George Kistiakowsky - Manhattan Project

Manhattan Project

He joined the Manhattan Project in 1944, replacing Seth Neddermeyer as head of the implosion department. Under his leadership came the complex explosive lenses needed to compress the plutonium sphere uniformly to achieve critical mass in Fat Man, the bomb dropped on Nagasaki.

In addition to the work on implosion, he contributed to skiing in Los Alamos by using rings of explosives to fell trees for a ski slope - leading to the establishment of Sawyer's Hill Ski Tow Association.

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