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EVB2948005: First nuclear reactor at the University of Chicago achieved the first self-sustaining chain reaction. December 2, 1942. Chicago Pile-1 (CP-1) was built under the direction of physicist Enrico Fermi, in collaboration with Leo Szilard. In 1943 it was dismantled and reassembled at the Palos Park unit of the Argonne National Laboratory. The drawing is by Melvin A. Miller of the Argonne National Laboratory / Bridgeman Images
EVB2948030: Supreme Court Justice Felix Frankfurter administers oath of office to Secretary of Navy, Col. Frank Knox. As World War 2 began in Europe, President Franklin Roosevelt organized a bi-partisan 'War Cabinet' including Republicans such as Knox in critical posts. July 11, 1940 / Bridgeman Images
EVB2948063: New York City fire fighter north of the collapsed Twin Towers. Behind him are other firemen, fire trucks, and rescue vehicles. In the background is smoke and pulverized building debris of the collapsed North and South Towers of the World Trade Center. New York City, Sept. 11, 2001 / Bridgeman Images