Rüdiger Gamm, the human calculator

Rüdiger Gamm is a German “mental calculator”. He attained his ability to calculate (memorize most of the time) complex mathematics in his head at the age of 21. As well, he can also speak backwards in complete sentences, and calculate calendars.
Part 2: http://www.youtube.com/watch?v=oqxhxIuEGRw

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