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National Museum of Nuclear Science & History

Nancy Greenewalt Frederick is the oldest daughter of Crawford Greenewalt, a chemical engineer who worked on the Manhattan Project and later become president of the DuPont Company. 

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Dunell Cohn was born in Oak Ridge, Tennessee, in 1944. Cohn’s father, Waldo, was recruited to work on the Manhattan Project in Chicago in 1942 for his work on radioisotopes at Berkeley and Harvard during the 1930s.

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