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  1. 1940 
  2.                                  June 3-German scientists fail to observe neutron multiplication in the reactor in Hamburg. 
  3.  
  4.                           1941 
  5.                                  January-Based on experiments with a natural uranium reactor, the Germans reject graphite as a
  6.                                  moderator.
  7.                                  July-British 'Maud' Committee reports that a weapon could be made with 10 kg of U-235; U.S.
  8.                                  Academy of Sciences endorses bomb program. 
  9.  
  10.                           1942 
  11.                                  May-Heisenberg and Dopel observe the first multiplication of neutrons.
  12.                                  December 2-First nuclear chain reaction at Chicago's Stagg Field by Fermi. 
  13.  
  14.                           1943 
  15.                                  March 15-Oppenheimer moves the bomb development to Los Alamos. 
  16.  
  17.                           1944 
  18.                                  August 26-Bohr presents his memorandum on intentional control of nuclear weapons to
  19.                                  Roosevelt.
  20.                                  November-First batch of spent fuel obtained from Hanford reactors.
  21.                                  November-Goudsmit's ALSOS mission obtains documents which imply that the German's rate
  22.                                  of progress toward a bomb had diminished. 
  23.  
  24.                           1945 
  25.                                  January- First Pu reprocessing production run at Hanford
  26.                                  January 20- First U-235 separated at Oak Ridge.
  27.                                  June 11- The Franck Report was sent to the Secretary of War.
  28.                                  July 16-U.S. explodes first atomic bomb, the Trinity test, at Alamogordo.
  29.                                  August 6,9-Atomic bombs dropped on Hiroshima and Nagasaki. 
  30.  
  31.                           1946 
  32.                                  June 14-Baruch presents the Acheson-Lilienthal plan to internationalize the atom to the U.N.
  33.                                  June 30- First subsurface detonation by U.S. at Bikini atoll.
  34.                                  July- Demonstrations in Times Square, New York, against nuclear testing.
  35.                                  December 31-AEC takes over nuclear weapons program from the Army. 
  36.  
  37.                           1948 
  38.                                  April, May-U.S. atomic tests, Eniwetok Atoll. 
  39.  
  40.                           1949 
  41.                                  April 4- NATO established.
  42.                                  August 29- First Soviet detonation, in the Ustyurt desert.
  43.                                  October 30-General Advisory Committee of the AEC recommends that the more powerful atomic
  44.                                  bombs should be built rather than hydrogen bombs.