Arthur Benjamin does "Mathemagic" ...

[cmeisenzahl]

Absolutely amazing.

Arthur Benjamin does "Mathemagic" | Video on TED.com
"In a lively show, mathemagician Arthur Benjamin races a team of calculators to figure out 3-digit squares, solves another massive mental equation and guesses a few birthdays. How does he do it? He'll tell you."
http://www.ted.com/index.php/talks/arthur_benjamin_does_mathemagic.html

 

[LED-holic]

Pretty amazing. Thanks for the link.

 

[adamlau]

I love TED Talks :twothumbs .