A tautology's truth is certain, a proposition's possible, a contradiction's impossible.

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Top Authors

• Henry David Thoreau

  Author

  Saturday, Jul 12, 1817
  Tuesday, May 06, 1862

• Isaac Newton

  Physicist

  Sunday, Jan 04, 1643
  Monday, Mar 31, 1727

• Elon Musk

  Investor

  Monday, Jun 28, 1971
  

• John Locke

  Philosopher

  Sunday, Aug 29, 1632
  Tuesday, Oct 28, 1704

• Helen Keller

  Author

  Sunday, Jun 27, 1880
  Saturday, Jun 01, 1968

• Albert Camus

  Author

  Friday, Nov 07, 1913
  Monday, Jan 04, 1960

• Ernest Hemingway

  Author

  Friday, Jul 21, 1899
  Sunday, Jul 02, 1961

• Tyler, The Creator

  Rapper

  Wednesday, Mar 06, 1991
  

• John Muir

  Author

  Saturday, Apr 21, 1838
  Thursday, Dec 24, 1914

• Martin Luther King, Jr.

  Civil Rights Activist

  Tuesday, Jan 15, 1929
  Thursday, Apr 04, 1968

• Oscar Wilde

  Writer

  Monday, Oct 16, 1854
  Friday, Nov 30, 1900

• Napoleon Hill

  Author

  Friday, Oct 26, 1883
  Sunday, Nov 08, 1970

• Nelson Mandela

  Former President Of South Africa

  Thursday, Jul 18, 1918
  Thursday, Dec 05, 2013

• Dolly Parton

  Singer-Songwriter

  Saturday, Jan 19, 1946
  

• Dr. Seuss

  Writer

  Wednesday, Mar 02, 1904
  Tuesday, Sep 24, 1991