Atomic Heritage Foundation

March 1939

March 1939

Enrico Fermi and Herbert Anderson find that there are about two neutrons produced for every one consumed in fission.

Date Range:

1939CE Mar

Era:

1938 to 1939: Discovering Fission

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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