No one knows who is the smartest person that ever lived, that is for sure. But some psychologists believe that William James Sidis reached the maximum capacity possible for a human. The same may apply for eg., the seer of visions, Emanuel Swedenborg, who was so intelligent that he turned mad in the later part of his life.

In the Buzan’s Book of Mental World Records, the highest IQ score ever attained is assigned to the history’s greatest universal genius Leonardo da Vinci. The estimate is a nearly unbelievable adult IQ of 220 St-Bin!

Here are some famous people with high IQ’s

IQ 140

Madonna (Singer)

Jean M. Auel (Author)

Geena Davis (Actress)

IQ 150

Sharon Stone (154) (Actress)

Carol Vorderman (154; Cattell?) (TV presenter)

Sir Clive Sinclair (159) (Inventor)

IQ 160

Bill Gates (CEO, Microsoft)

Jill St. John (Actress)

Paul Allen (160+, Microsoft cofounder)

Stephen W. Hawking (160+) (Physicist)

IQ 170

Andrew J. Wiles (Mathematician; solved Fermat’s Last Theorem)

Judith Polgar (Formula based; Female World Champion in Chess)

IQ 180

James Woods (Actor)

John H. Sununu (Chief of Staff for President Bush)

Benjamin Netanyahu (Israeli Prime Minister)

Marilyn Vos Savant (186) (Author)

Bobby Fischer (187) (Former World Champion in Chess)

IQ 190

Philip Emeagwali (Extrapolated; Nigerian Mathematician)

IQ 200

Kim Ung-Yong (S. Korea; Showed similar child capabilities as J.S. Mill)

(lol jks, its you =])