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Math fans around the world celebrate Pi Day on March 14 or 3/14 — the first three digits of an infinite number with many uses. Many mark the day with a slice of pie — sweet, savory or even pizza

Founded in 1988 at the Exploratorium, Pi (π) Day has become an international holiday, celebrated live and online all around the world. The numbers in the date (3/14) match the first three digits of the mathematical constant pi (π). What is π, anyway? Divide any circle’s circumference by its diameter; the answer (whether for a pie plate or a planet) is always approximately 3.14, a number we represent with the Greek letter π. Keep calculating π’s digits with more and more accuracy—as mathematicians have been doing for 4,000 years—and you’ll discover they go on literally forever, with no pattern.

March 14 or 3/14 is pi day, or 3.14 Celebrate with your favorite PIE!

Today is PI day! 3/14 Tomorrow is the Ides. In Europe they celebrate PI day on 22 July.

Gaurav Raja can't explain how he memorized such a big slice of pi. The 15-year-old from Salem, Va., insists that there is no trick to memorizing 10,980 digits of pi, a feat that makes him the North American record-holder. He just did it. "I don't see anything in my head. It's just kind of there," he said yesterday. "It just flows, I guess." Gaurav has become a mathematical legend despite being a rising senior at Salem High School.