Sunday, May 4, 2008

ted.com - " MATHEMAGICIAN " - FUN AND MUST SEE PRESENTATION - Benjamin: Lightning calculation and other "Mathemagic"

In a lively show, "mathemagician" Arthur Benjamin races a team of calculators to figure out 3-digit squares in his head, performs a massive mental calculation, and guesses a few birth days. How does he do it? He'll be happy to tell you.

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