Daniel Tammet: meet the autistic savant

Meet Daniel Tammet, a 27 year-old math and memory wizard. He can do things with numbers that will truly amaze you.

Daniel Tammet is an autistic savant with Asperger's syndrome. Unlike other savants, who can perform similar feats, Tammet can describe how he does it (self-introspection). He speaks seven languages and is even devising his own language.