
William James Sidis often lays claim to the title of the smartest man ever. Sidis was estimated to have an IQ in the 250–300 range.
Born on April 1, 1898, in New York City, William James Sidis was the son of Boris Sidis, a psychologist, and Sarah Mandelbaum Sidis, a physician. Both parents were Jewish Ukrainian immigrants, and they recognized their son’s prodigious talents early on.
By the age of 2, Sidis was reading The New York Times. At 6, he had already taught himself Latin, Greek, Russian, French, German, and Hebrew. And by the age of 8, he had even written a comprehensive anatomy textbook.









