Albert Einstein: I did not speak until he was four and did not read until he was seven, causing my teachers and parents to think he was mentally handicapped, slow and anti-social. Eventually, I was expelled from school and was refused admittance to the Zurich Polytechnic School. It might have taken me a bit longer, but most people would agree that he caught on pretty well in the end, winning the Nobel Prize and changing the face of modern physics.