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LITTLE ROCK, Ark. (KTHV) -- Today is National Pi Day! Unfortunately that has nothing to do with the food.

It's an actual day to celebrate a numerical ratio! It's celebrated every year on march 14th. That's 3-14, as in the first few digits of pi.

Pi is the ratio of a circle's circumference, to its diameter. The number goes on and on without stopping or repeating. At least as far as we know.

Computers have calculated pi to its two-quadrillionth digit.