6、William J. Sidis, was born in 1898. _ _ 21 _ _ father was an American psychiatrist. At the age of six months, William knew the English alphabet; he could read and write when he was two. When he was eight years _ _ 22 _ _ , young Sidis had completed both elementary and high school. At the age of nine, William entered Harvard University.
As a _ _ 23 _ _ at Harvard, Sidis displayed phenomenal knowledge in the field of mathematics, often amazing his professors. He graduated with honors _ _ 24 _ _ the age of 16 and became a full professor of mathematics at the university at 19.
The story of William J. Sidis unfortunately, does not end happily.
This brilliant ex-genius died a lonely death in 1943 in a hotel room _ _ 25 _ _ New York.