The brain is the only organ in that body that scientists do not have an almost complete diagram of how it works, and people like Daniel Tammet just accentuate that point. Tammet has an amazing mind. After experiencing epileptic seizures at the age of 4, Tammet has the amazing ability to remember series of numbers and do complicated math in his head. Large multiplications or divisions provided no problem while the rest of us would need a calculator. Tammet claims that his brain just tells him the answer, and that he does not actually have to do any thinking.
Tammet is also a whiz with words. He is fluent in 8 languages including English, French, Finnish, German, Spanish, Lithuanian, Romanian, Estonian, Welsh and Esperanto. I haven't even heard of some of those! He was given a challenge. It was said that he could not learn Icelantic in a week and prove his fluency on a national television store. When the week was over, the host said he was "not human".
Tammet is an amazing man, but the most amazing thing about him has to be that he developed these abilities from epileptic seizures. It would be interesting to know what went on in the brain, what new connections were made. Also if his brain really is telling him the answer or if his he is just processing information faster than he can comprehend. Or maybe the part of his brain is now cut off from his consciousness.