William James Sidis: The Man Who Spoke 25 Languages - History of Yesterday

And even created his own language

William James - Wikipedia

24 of the smartest people who ever lived - Big Think

The Animate and The Inanimate by William James Sidis

Bio of William Sidis

The guy in the picture is Stephen Hawking : r/facepalm

Who Was William James Sidis, The Smartest Person In The World?

Why did the most intelligent man in the world (William James Sidis) leave nothing relevant in the World of Mathematics or other disciplines? - Quora

The Prodigy: A Biography of William James Sidis, America's Greatest Child Prodigy by Amy Wallace

The Highest IQs Ever: Meet 27 Of The World's Smartest People

A Tortured Genius. William James Sidis, born (1898) was an…, by Kerianne Sheree

James Sidas, House Wiki

20 Amazing Polyglots in History That Most People Didn't Know About

William James Sidis Is Likely the Smartest Man to Have Ever Lived