Memorize 39 Digits of Pi View website

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Why 39 digits? You only need 39 digits of pi to measure the circumference of the observable universe within the width of one hydrogen atom. Memorize 3.14159265358979323846264338327950288419 at http://memorize39digitsofpi.com and buy the t-shirt to show off to your friends!

Last updated 15 Mar 2015