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Events
1862 – The first pasteurization test completed by Louis Pasteur and Claude Bernard.
1902 – Pierre and Marie Curie refine radium chloride.
Births
1745 – Philippe Pinel, French physician
1904 – George Stibitz, American scientist
1918 – Kai Siegbahn, Swedish physicist, Nobel Prize laureate
1927 – Karl Alexander Müller, Swiss physicist, Nobel Prize laureate
1928 – Gerald S. Hawkins, English astronomer
Deaths
1831 – John Abernethy, English surgeon
1918 – Karl Ferdinand Braun, German physicist, Nobel Prize laureate
1932 – Giuseppe Peano, Italian mathematician
2003 – Bernard Katz, German-born biophysicist, recipient of the Nobel Prize in Physiology or Medicine
April 20, 2007