If you cannot state a proposition clearly and unambiguously, you do not understand it.

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• Carrie Fisher

  Actress

  Sunday, Oct 21, 1956
  Tuesday, Dec 27, 2016

• Isaac Newton

  Physicist

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

• Zig Ziglar

  Author

  Saturday, Nov 06, 1926
  Wednesday, Nov 28, 2012

• George Carlin

  Comedian

  Wednesday, May 12, 1937
  Sunday, Jun 22, 2008

• Theodore Roosevelt

  26Th U.s. President

  Wednesday, Oct 27, 1858
  Monday, Jan 06, 1919

• Mother Teresa

  Saint

  Friday, Aug 26, 1910
  Friday, Sep 05, 1997

• Thomas Sowell

  Economist

  Monday, Jun 30, 1930
  

• George Orwell

  Novelist

  Thursday, Jun 25, 1903
  Saturday, Jan 21, 1950

• Julius Caesar

  Roman Dictator

  Thursday, Jan 01, 1970
  

• Robert Frost

  Poet

  Thursday, Mar 26, 1874
  Tuesday, Jan 29, 1963

• Vince Lombardi

  Football Player

  Wednesday, Jun 11, 1913
  Thursday, Sep 03, 1970

• Mahatma Gandhi

  Civil Rights Leader

  Saturday, Oct 02, 1869
  Friday, Jan 30, 1948

• Stephen Hawking

  Physicist

  Thursday, Jan 08, 1942
  

• Billy Graham

  Evangelist

  Thursday, Nov 07, 1918
  

• Vincent Van Gogh

  Painter

  Wednesday, Mar 30, 1853
  Tuesday, Jul 29, 1890