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  1. 1920 
  2.                                  Rutherford speculates on the existence of the neutron at the Royal Society. 
  3.  
  4.                           1931 
  5.                                  November-Urey discovers deuterium. 
  6.  
  7.                           1932 
  8.                                  February-Chadwick discovers the neutron. 
  9.  
  10.                           1933 
  11.                                  April-Born, Courant, Franck and many other scientists are compelled to leave the University of
  12.                                  G≈°ttingen because of their "Jewish physics"
  13.                                  October-Szilard recollects that "It occurred to me in October, 1933 that a chain reaction might be
  14.                                  set up if an element could be found that would emit two neutrons when it swallowed one
  15.                                  neutron."This idea became a classified British patent in 1935 before the fission was discovered. 
  16.  
  17.                           1934 
  18.                                  Artificial radioactivity discovered by Curie/Joliot (bombardment with alpha particles) and by
  19.                                  Fermi (bombardment with neutrons). 
  20.  
  21.                           1938 
  22.                                  December-Fermi receives the Nobel prize for the discovery of transuranic elements (actually
  23.                                  fission of uranium) and departs for the "new world"
  24.                                  December 22, Hahn and Strassmann (later Meiter and Frisch) conclude that the identification of
  25.                                  barium implies that the uranium nucleus has been fissioned by neutrons. 
  26.  
  27.                           1939 
  28.                                  January to May-Many experiments on uranium fission.
  29.                                  August 2-Szilard, Wigner, and Teller obtain a letter from Einstein on the possibility of a uranium
  30.                                  weapon; Roosevelt receives the letter on October 11, 1939 from Sachs.