This summary by Scot is worth a read. Because Daniel Tammet is a normal man whose talents came as the result of a seizure, he is able to describe his condition. He can do amazing math (by visualizing it) and learn languages fluently in a week (by “getting” their form.)
birdhouse.org/blog/2006/10/22/the-brainman/
Two extra videos from the show:
Stories like this are like peekng behind a wonderful curtain.