Atomic Heritage Foundation

1943 April

1943 April

Seth Neddermeyer begins research on implosion, seeking to compress hollow metal assemblies.

Date Range:

1943CE Apr

Era:

1942 to 1943: Early Manhattan Project

Hear the stories of the Manhattan Project

Browse our collection of oral histories with workers, families, service members, and more about their experiences in the Manhattan Project.

Tour the Sites of the Manhattan Project

Tour some of the key locations of the Manhattan Project with an audio guide.

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Albert Einstein receiving his his certificate of U.S. citizenship in 1940 from Judge Philip Forman. Photo courtesy Al Aumuller/Library of Congress.

Scientist Refugees and the Manhattan Project

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