I found this facinating video over at Fede's site Strayed, Uncorrelated Thoughts. If you have the time, I highly recommend watching it. It's about an extremely high functioning savant, Daniel Tammet. He first came to worldwide attention in March 2004 on International Pi Day when he recited, from memory, Pi to 22,514 decimal places. The event took over five hours and he set a new European record. He used this event to raise funds for the National Society for Epilepsy because it was after a series of childhood seizures that he developed his extrodinary number and memory abilities.
Daniel is highly articulate which is unusual as most savants also exhibit severe disabilities. Thus he is invaluable to science as he is able to describe what is going on in his head while he is making massive caculations. In addition to his number and massive memory skills, he also has exceptional language skills. He speaks over seven languages fluently and at the end of this documentary he is put to the ultimate test as he attempts to learn Icelandic in just 7 days and then appear on national television. Watch to find out what happens.