Despite tight security, Communist spies leaked information to the [[Soviet Union]] who soon started a similar project.
Despite tight security, Communist spies leaked information to the [[Soviet Union]] who soon started a similar project.
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==Project Participants==
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*Stanislaw Ulam (1909-1984) was a [[Poland|Polish]] mathematician who immigrated to the United States, joined the Manhattan Project to work on the development of the [[atomic bomb]], and with [[Edward Teller]] developed the model to produce the more powerful [[H-bomb]].