College students, rocket scientists and math enthusiasts around the world are celebrating Pi Day. The holiday on March 14 — ...

Pi Day was first celebrated in 1988 at San Francisco's Exploratorium, a museum of science and technology that encourages visitors to be hands-on.

Pi, which is the ratio of a circle's circumference to its diameter, is celebrated with its own holiday on March 14.

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