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On an unknown date in 1789, a German Scientist named Martin Klaproth discovered Uranium.
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On an unknown date in 1895, a scientist named Wilhelm Rontgen discovered ionizing radiation.
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Plutonium was created by British and American scientists.
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In December 1942, the United States had been given access to all documents from British Nuclear experiments, and the US had devoted money to creating the Chicago Pile - 1 plant.
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In Alamagordo in New Mexico, the first atom bomb was successfully tested by the US
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The first atomic bomb used in war was dropped by the U.S. on Hiroshima.
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The second nuclear weapon, "Fat Man" was detonated on Nagasaki, Japan by the U.S.
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In Chernobyl, Ukraine, a nuclear reactor's cooling system fails and causes an explosion and a massive leak of radiation into the surrounding area.