We're going to need a definitive quantum theory of gravity, which is part of a grand unified theory - it's the main missing piece.

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• Abraham Lincoln

  16Th U.S. President

  Sunday, Feb 12, 1809
  Saturday, Apr 15, 1865

• Stephen Hawking

  Physicist

  Thursday, Jan 08, 1942
  

• Thomas Jefferson

  3Rd US President

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

• Aldous Huxley

  Writer

  Thursday, Jul 26, 1894
  Friday, Nov 22, 1963

• W. Edwards Deming

  Statistician

  Sunday, Oct 14, 1900
  Monday, Dec 20, 1993

• Leonardo Da Vinci

  Painter

  Thursday, Apr 15, 1452
  Friday, May 02, 1519

• George Orwell

  Novelist

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

• Niccolo Machiavelli

  Historian

  Monday, May 03, 1469
  Tuesday, Jun 21, 1527

• Zig Ziglar

  Author

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

• Sun Tzu

  Strategist

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

• Les Brown

  Author

  Saturday, Feb 17, 1945
  

• Dolly Parton

  Singer-Songwriter

  Saturday, Jan 19, 1946
  

• Helen Keller

  Author

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

• Nelson Mandela

  Former President Of South Africa

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

• Friedrich Nietzsche

  Philologist

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