1934    Artificial radioactivity discovered by Curie/Joliot (bombardment with alpha
	particles) and by Fermi (bombardment with neutrons). 

1938    December-Fermi receives the Nobel prize for the discovery of transuranic 
	elements (actually fission of uranium) and departs for the "new world"
	December 22, Hahn and Strassmann (later Meiter and Frisch) conclude that 
	the identification of barium implies that the uranium nucleus has been 
	fissioned by neutrons. 

1939    January to May-Many experiments on uranium fission.
	August 2-Szilard, Wigner, and Teller obtain a letter from Einstein on the 
	possibility of a uranium weapon; Roosevelt receives the letter on October 11,
	1939 from Sachs.