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Neil deGrasse Tyson attends Film Independent at LACMA presents StarTalk — A Conversation with Astrophysicist Neil deGrasse Tyson, on June 5 in Los Angeles. Araya Diaz/Getty Images hide caption

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Araya Diaz/Getty Images

In 1952, atomic scientists came together on the 10th anniversary of the first controlled nuclear fission chain reaction, which took place Dec. 2, 1942, at the University of Chicago. Courtesy of University of Chicago Photographic Archive hide caption

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Courtesy of University of Chicago Photographic Archive

Vintage American history photo of a nuclear weapon test by the American military at Bikini Atoll, Micronesia on July 25, 1946. The explosion was part of Operation Crossroads. John Parrot/Stocktrek Images/Getty Images hide caption

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John Parrot/Stocktrek Images/Getty Images

An archival view of Oak Ridge, Tenn. shows one of the three sites that has been included in the Manhattan Project National Historical Park. United States Department of Energy/Flickr hide caption

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United States Department of Energy/Flickr

Passions Flare Over Memory Of The Manhattan Project

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Seven Decades Ago, A New, Enormous Kind Of Explosion

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