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 ...

Happy Pi Day! For decades, math lovers have been honoring this crucial irrational constant on March 14 (or 3/14, the first three digits of the ratio of a circle's circumference to its diameter) every ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. Math enthusiasts around the world, from ...

Pi is actually an irrational number that is most often approximated with the decimal 3.14. It's a special day for those who love mathematics and want to honour Albert Einstein. March 14 every year is ...