Useless Trivia

Scarlet

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Mar 3, 2008
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It requires a mere 39 digits in order to compute the circumference of a circle of radius (an upper bound on the distance travelled by a particle moving at the speed of light for 20 billion years, and as such an upper bound for the radius of the universe) with an error of less than 10-12 meters (a lower bound for the radius of a hydrogen atom).