William James Sidis was a child prodigy. At 18 months old, he could read The New York Times and understand everything. At 6 years, he could calculate any date that fell in the last 10,000 years. At 11 years, he applied for Harvard University and got accepted, while being able to speak 25 separate languages. His IQ was estimated to be about 275, much more than Albert Einstein’s 160.