There are no separate systems. The world is a continuum. Where to draw a boundary around a system depends on the purpose of the discussion.

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Top Authors

• Albert Camus

  Author

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

• Aristotle

  Philosopher

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

• Ernest Hemingway

  Author

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

• Edgar Allan Poe

  Author

  Thursday, Jan 19, 1809
  Sunday, Oct 07, 1849

• Helen Keller

  Author

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

• Julius Caesar

  Roman Dictator

  Thursday, Jan 01, 1970
  

• Alfred Lord Tennyson

  Poet

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

• Stephen Hawking

  Physicist

  Thursday, Jan 08, 1942
  

• William Blake

  Poet

  Monday, Nov 28, 1757
  Sunday, Aug 12, 1827

• Steven Wright

  Comedian

  Tuesday, Dec 06, 1955
  

• Heraclitus

  Philosopher

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

• John F. Kennedy

  35Th U.s. President

  Tuesday, May 29, 1917
  Friday, Nov 22, 1963

• Jordan Peterson

  Psychologist

  
  

• Khalil Gibran

  Poet

  Saturday, Jan 06, 1883
  Friday, Apr 10, 1931

• Elon Musk

  Investor

  Monday, Jun 28, 1971