A scientist is never certain. ... We absolutely must leave room for doubt or there is no progress and there is no learning.

Picture Quotes Maker

Top Authors

• Leonardo Da Vinci

  Painter

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

• Ernest Hemingway

  Author

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

• Kobe Bryant

  Basketball Player

  Wednesday, Aug 23, 1978
  

• Julius Caesar

  Roman Dictator

  Thursday, Jan 01, 1970
  

• Samuel Taylor Coleridge

  Poet

  Wednesday, Oct 21, 1772
  Friday, Jul 25, 1834

• Stephen Covey

  Author

  Monday, Oct 24, 1932
  Monday, Jul 16, 2012

• Elon Musk

  Investor

  Monday, Jun 28, 1971
  

• Rodney Dangerfield

  Comedian

  Tuesday, Nov 22, 1921
  Tuesday, Oct 05, 2004

• Alfred Lord Tennyson

  Poet

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

• Peter Drucker

  Author

  Friday, Nov 19, 1909
  Friday, Nov 11, 2005

• Joe Biden

  Vice President Of The United States

  Friday, Nov 20, 1942
  

• Plato

  Philosopher

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

• Steve Jobs

  Entrepreneur

  Thursday, Feb 24, 1955
  Wednesday, Oct 05, 2011

• Robert Frost

  Poet

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

• Napoleon Hill

  Author

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