motivation is highest when the probability of success is 50 percent: We don't get involved if the task is too easy or too hard.

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• Pope John Paul Ii

  Priest

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

• George Bernard Shaw

  Playwright

  Saturday, Jul 26, 1856
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• Marcus Aurelius

  Roman Emperor

  Saturday, Apr 26, 0121
  Friday, Mar 17, 0180

• Dr. Seuss

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  Wednesday, Mar 02, 1904
  Tuesday, Sep 24, 1991

• Kobe Bryant

  Basketball Player

  Wednesday, Aug 23, 1978
  

• Wayne Dyer

  Author

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

• Jordan Peterson

  Psychologist

  
  

• Nelson Mandela

  Former President Of South Africa

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

• Edgar Allan Poe

  Author

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

• Jean De La Bruyere

  Wednesday, Aug 16, 1645
  Thursday, May 10, 1696

• Joe Biden

  Vice President Of The United States

  Friday, Nov 20, 1942
  

• Isaac Newton

  Physicist

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

• Socrates

  Philosopher

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

• Zig Ziglar

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

• Oprah Winfrey

  Media Proprietor

  Friday, Jan 29, 1954