George Finn and Daniel Tammet.

George Finn is a man with a rare condition called autism. He was in the video Rain Man because for example, say they said in September the 21st, what is the weather going to be, and he would answer it with the correct answer. Daniel Tammet is an english young man who suffers the same condition. Daniel is a maths genius and a great brain capacity which means a great memory. A few years later, he decided that he was going to memorize the first 22,000 digits of PI. PI actually never ends, it goes to infinity. He took 5 hours to memorize it. Daniel tammet and George Finn's condition is extremely rare, there are only 52 people in the world with the same condition.