Happy Pi Day! Celebrate the mathematical mystery with the edible one

March 13, 2015 9:55 PM

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For mathematicians, Saturday is a once-in-a-century celebration of mystery.

Pi -- the number denoted in shorthand as 3.1415 -- is an irrational number with an infinite number of digits. Mathematicians have calculated pi out to billions of digits. Still, they haven't found a pattern.

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