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"Great Debate" between H. Shapely and H. Curtis on the nature of spiral galaxies Saha, ionization equation --- 2 January 1920 Birth of George Howard Herbig 13 January 1920 Birth of Lev Pavlovich Rapoport 16 February 1920 Death of Paul Friedrich Ferdinand Kempf in Potsdam, Germany 11 March 1920 Birth of Nicolaas Bloembergen 26 April 1920 Death of Srinivasa Ramanujan 10 July 1920 Birth of Owen Chamberlain 29 September 1920 Birth of Peter Dennis Mitchell 2 December 1920, Birth of William de Wiveleslie Abney in Folkestone, Kent, England 6 December 1920 Birth of George Porter 1920 Birth of Chusiro Hayashi 1920 Birth of Rosalind (Elsie) Franklin 1920 Birth of Thomas Gold 1920 Birth of Keith R Symon 1920 Birth of Sir John Adams 1920 Birth of Mervyn Hine 1920 Birth of Hugh Hereward --- Nobel Prize Physics to Charles Edouard Guillaume in recognition of the service he has rendered to precision measurements in Physics by his discovery of anomalies in nickel steel alloys. Chemistry to Walther Hermann Nernst "in recognition of his work in thermochemistry" Physiology or Medicine to Schack August Steenberg Krogh "for his discovery of the capillary motor regulating mechanism"
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