Mark your calendars! There's just one day and 15 hours left until "Pi Day". Pi is the mathematical symbol for the ratio of the circumference of a circle to it's diameter. Pi Day is celebrated by math enthusiasts around the world on March 14th. Pi = 3.1415926535… (Get it, 3/14 in month/day format?).
Pi Day was created by Larry Shaw in 1988 when he was at the San Francisco Exploratorium working as a Physicist. The initial celebration involved staff and the public walking around one of the circular spaces, and then consuming fruit pies. In March of 2009 the U.S. House of Representatives passed a non-binding resolution recognizing March 14 as National Pi Day.