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OCR: 1934 Artificial radioactivity discox rered by Curie/ loliot (bombardment with alpha particles) and by Fermi (bombardment with neutrons) 1938 December -Fermi receives the Nobel prize for the of transuranic elements (actually fission uranium, and departs for the' "new world December 22 Hahn and Strassmann (later Meiter and Frisch) conclude that the identification barium implies that the uranium nucleus has been fissioned by neutrons 1939 Januar to May-Many experiment on uranium fission. August -Szilard, Wigner, and Teller obtain letter from Einstein on the possibility o auranium weapon; Roosevel receives the letter on October 11, 1939 from Sachs discovered Joliot discovery conchude January experiments Roosevelt