Writers of all things speculative have played in alternate and parallel worlds for a long time - everyone from Stephen King to Philip Pullman to Tanith Lee - and it's an obsession that likely isn't going away any time soon.

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• Sun Tzu

  Strategist

  Thursday, Jan 01, 1970
  Thursday, Jan 01, 1970

• Pope John Paul Ii

  Priest

  Tuesday, May 18, 1920
  Saturday, Apr 02, 2005

• Soren Kierkegaard

  Philosopher

  Wednesday, May 05, 1813
  Sunday, Nov 11, 1855

• Stephen Hawking

  Physicist

  Thursday, Jan 08, 1942
  

• H. L. Mencken

  Journalist

  Sunday, Sep 12, 1880
  Sunday, Jan 29, 1956

• Billy Graham

  Evangelist

  Thursday, Nov 07, 1918
  

• Kim Kardashian

  Television Personality

  Tuesday, Oct 21, 1980
  

• Carl Sagan

  Astronomer

  Friday, Nov 09, 1934
  Friday, Dec 20, 1996

• Henry David Thoreau

  Author

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

• Wayne Dyer

  Author

  Friday, May 10, 1940
  Saturday, Aug 29, 2015

• Charles Spurgeon

  Preacher

  Thursday, Jun 19, 1834
  Sunday, Jan 31, 1892

• Friedrich Nietzsche

  Philologist

  Tuesday, Oct 15, 1844
  Saturday, Aug 25, 1900

• Thomas Jefferson

  3Rd US President

  Saturday, Apr 13, 1743
  Tuesday, Jul 04, 1826

• Robert Frost

  Poet

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

• Alfred Lord Tennyson

  Poet

  Saturday, Aug 05, 1809
  Thursday, Oct 06, 1892