Despite his superior intelligence, William James Sidis never found the same success as other legendary geniuses.

In 1898, the smartest man who ever lived was born in America. His name was William James Sidis and his IQ was eventually estimated to be between 250 and 300 (with 100 being the norm).

His parents, Boris and Sarah, were pretty intelligent themselves. Boris was a famed psychologist, while Sarah was a doctor. Some sources say the Ukrainian immigrants made a home for themselves in New York City, while others cite Boston as their stomping grounds.

Either way, the parents delighted in their gifted son, spending untold money on books and maps to encourage his early learning. But they had no idea just how early their precious child would catch on.


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