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Another Rain Man

pi를 22,514 자리수까지 외우고 있는 '또 다른 레인맨'인 Daniel Tammet이 연산하는 방법.

When I multiply numbers together, I see two shapes. The image starts to change and evolve, and a third shape emerges. That's the answer. It's mental imagery. It's like maths without having to think. [A genius explains]