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#38 - lollipoppizza (03/15/2013) [-]
You only need to know pi to 39 digits to accurately calculate the circumference of the observable universe within the width of one hydrogen atom. Any more digits are essentially useless.
[small]Source: www.youtube.com/watch?v=FpyrF_Ci2TQ[small] btw numberphile is an awesome channel.
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