Thursday, Aug 20, 2020, 6:36 pm

By:Tony Williams

#4 William James Sidis

Considered the smartest man in the world, William James Sidis had an astonishing IQ of up to 300. Graduating grammar school in 7 months, he attended Harvard when he was just 11 years old, and learning 40 languages by adulthood, he is a math specialist. At the age of 66, he died of brain damage.