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Anonymous
Needs captioning. Take pride in IRC.
>> Anonymous
this reminded me of the Mathemagics:

http://www.ted.com/index.php/talks/arthur_benjamin_does_mathemagic.html
>> Anonymous
Yeah, Prof. Benjamin does cool shit like that. Nothing like seeing him do it live, squaring four-digit numbers in his head faster than students in the class on their calculators. He's a great teacher, too.