SAN FRANCISCO -- Every March 14, mathematicians, scientists and math lovers around the world celebrate Pi Day, a commemoration of the mathematical sign Pi. That's because the date written numerically ...

Pi is an irrational number, meaning it has an infinite number of nonrepeating decimal places. But it turns out, NASA scientists need only a small slice of pi — the first 15 decimal places — to solve ...

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The celebration of March 14 began as a weird Bay Area tradition. By Soumya Karlamangla Children in math classes across America will soon be discussing the magic of a circle’s circumference and, ...