Interesting Number - Pi

Pi has been calculated to its two-quadrillionth digit.

(Yes, using computers at Yahoo to crunch the numbers, a researcher, Nicholas Sze, has calculated the 2,000,000,000,000,000th digit of the mathematical constant pi.  It took 23 days on 1,000 of Yahoo's computers, but don't try this at home, on a standard PC, the calculation would take around 500 years!)

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