Pi is an irrational number, and like some irrational people it just goes on and on. What is it with this crazy, crucial ...

Pi belongs to a huge mathematical group called irrational numbers, which go on forever and cannot be written as fractions.

Friday is Pi Day, a national celebration of the mathematical concept, which is the ratio of a circle's circumference to its ...

A 10-year-old British boy celebrated the run-up to the math-themed holiday Pi Day by breaking a world record for the most ...