The APO target room at the Carnegie Institution's Department of Terrestrial Magnetism after the demonstration of fission there on Jan. 28, 1939.
L to r, Robert Meyer, Merle Tuve, Enrico Fermi, Richard Roberts, Leon Rosenfeld, Erik Bohr, Niels Bohr, Gregory Breit, John Fleming.
Courtesy of the Department of Terrestrial Magnetism, Carnegie Institution of Washington

January 1939
Neils Bohr brings the news of fission to the U.S. when he travels there for a conference.
Scientists quickly duplicate Frisch's experiment and confirm nuclear fission.



The vertical pulses on the oscilliscope screen indicate the fission of U-235 nuclei. It was these pulses that Fermi and his team missed but that Frisch saw in his experiments to verify nuclear fission in Janurary 1939.

Courtesy of F.W. Goro/Life

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