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Calendar For April
  April 1-30 Mathematics Education Month More...
  April 1-30 National Humor Month More...
  Apr 1 April Fools' Day More...
  Apr 1, 1776 Sophie Germain (1776-1831), French mathematician More...
  Apr 1, 2006 Project Workshop More...
  Apr 1, 2013 National Kite Month More...
  Apr 1, 2013 National Kite Month More...
  Apr 2, 1925 Julian D. Cole (1925-1999), American mathematician More...
  Apr 3, 1909 Stanislaw Marcin Ulam (1909-1986), Polish-American mathematician More...
  Apr 3, 1934 Jane Goodall (1934 - ?), American environmentalist and animal naturalist
  Apr 4, 1877 First home phone installed
  Apr 6, 1931 First Hostess Twinkies sold
  Apr 7, 1795 Metric System adopted More...
  Apr 7, 1864 First Camel Race in America More...
  Apr 9, 1931 Heisuke Hironaka (1931-?), Japanese American mathematician More...
  Apr 10, 1849 Safety pin patented More...
  Apr 10, 1866 ASPCA was founded More...
  Apr 10, 1930 Carl Herz (1930-1995), American-Canadian mathematician More...
  4/12/1892 First portable typewriter patented
  Apr 13, 1899 Birthday of Alfred Butts who.... More...
  Apr 14, 1629 Christiaan Huygens (1629-1695), Dutch physicist/mathematician More...
  Apr 14, 1860 First pony express rider reaches destination of San Francisco. More...
  Apr 15 Income Tax Day
  Apr 15, 1452 Leonardo da Vinci (1452-1519), Italian inventor-scientist-artist More...
  Apr 15, 1707 Leonhard Euler (1707-1783), Swiss mathematician More...
  Apr 16, 1889 Cahrles Chaplin (1889 - 1977), American film comedian
  Apr 17, 1885 First Hershey's chocolate sold
  Apr 18, 1662 First Book Auction More...
  Apr 18, 1916 Ellis Kolchin (1916-1991), American mathematician More...
  Apr 19, 1883 Richard von Mises (1883-1953), Austrian/American mathematician/engineer More...
  Apr 19, 1931 Cuthbert Corwin Hurd (1911- ?), American computer scientist More...
  Apr 19, 1957 Run of first Fortran program...error! More...
  Apr 21, 1838 John Muir (1838 - 1914), American naturalist
  Apr 21, 2007 Project Workshop: Connections Between Art and Math More...
  Apr 22 Earth Day More...
  Apr 24, 1800 First books purchased for Library of Congress More...
  Apr 24, 1919 David Harold Blackwell (1919-?), American mathematician More...
  Apr 24, 1981 IBM PC debuted
  Apr 24, 2013 Administrative Professionals Day
  Apr 25, 1912 Donald C. Spencer (1912-2001), American mathematician More...
  Apr 26, 1785 John James Audubon (1785 - 1851), American naturalist
  Apr 26, 1889 Ludwig Wittgenstein (1889-1951), Austrian-English mathematician/philosopher More...
  Apr 28, 1906 Kurt Godel (1906-1978), Austrian-American mathematician/logician More...
  Apr 28, 1928 Invention of Jiffy Biscuit Mix
  Apr 28, 1937 David Herbert Fowler (1937-2004), British mathematics historian More...
  Apr 29, 1854 Jules Henri Poincare (1854-1912), French mathematician More...
  Apr 29, 1917 Zipper invented by Gideon Sundback
  Apr 30, 1777 Carl Friedrich Gauss (1777-1855), German mathematician More...
  Apr 30, 1904 George R. Stibitz (1904-1995), American computer scientist More...