Savant Syndrome is a rare, but spectacular, condition in which persons with various developmental disorders, including autistic disorder, have astonishing islands of ability, brilliance or talent that stand in stark, markedly incongruous contrast to overall limitations.
Daniel Tammet first came to worldwide attention in March 2004 on international Pi Day (3/14, of course) when he recited, from memory, Pi to 22,514 decimal places.
The story of Leslie Lemke begins in Milwaukee in 1952. His mother gave him up for adoption at birth. "Leslie Lemke is a memorable man." That was Morley Safer's description of Leslie after he watched him play the piano as part of a 60 Minutes program in 1983 on savant syndrome. Dustin Hoffman watched the program and was "moved to tears" by Leslie.
Other fashinating Video excerpts.
Kim Peek: The Real Rain Man, Gilles Tréhin: City Creator, ...