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Pi Day is March 14 (3/14 - get it?). The mathematical constant 'Pi' has been around for years, but the pomp and circumstance of Pi Day has only recently evolved into a celebration for the masses.

The first known Pi Day celebration was in San Francisco in 1988. According to NationalGeographic.com:

Larry Shaw, a physicist at the Exploratorium, the San Francisco science museum, looked at the calendar and said, "March 14—it's the number pi. It's Pi Day. Let's celebrate!" So he and his colleagues ordered some pie for the staff, and thus was a great tradition born. Today Pi Day is celebrated in schools, universities, and museums around the world."

Then on March 9, 2009, the US House of Representatives passed House Resolution 224 supporting the designation of Pi Day.

Last year Pi Day was even more significant - 3.1415, which is the furthest you can go in the equation using a date (except for the year 1592).

So, how will you celebrate Pi Day? I just might eat a pie. Cherry or Chocolate Cream, I can't decide. If you want to see how other will celebrate (or you want to get ideas on how you can celebrate, visit the Pi Day Web site).