Portal:History of science/Selected anniversaries/July 20

July 20:

 * 1822 - Birth of Gregor Mendel, German scientist, father of modern genetics (d. 1884)


 * 1866 - Death of Bernhard Riemann, German mathematician (b. 1826)


 * 1876 - Birth of Otto Blumenthal, German mathematician (d. 1944)


 * 1897 - Birth of Tadeus Reichstein, Polish-born chemist, Nobel Prize in Physiology or Medicine laureate (d. 1996)


 * 1909 - Birth of Jean Focas, Greco-French astronomer (d. 1969)


 * 1922 - Death of Andrey Markov, Russian mathematician (b. 1856)


 * 1947 - Birth of Gerd Binnig, German-born physicist, Nobel laureate


 * 1960 - The Polaris missile is successfully launched from a submarine, the USS George Washington, for the first time