When William (Billy) Sidis was barely 3 years old, the story goes, he taught himself a language: Latin. By the time he was 6, he had added Russian, …
William James Sidis Is Likely the Smartest Man to Have Ever Lived
Some say his IQ was 50 to 100 points higher than Albert Einstein's. So why haven't you heard his name before? We'll tell you the sad tale of why this incredible genius flamed out, plus stories about other remarkably intelligent people.