Pi Day is the celebration of the mathematical constant, the ratio of a circle’s circumference to its diameter: 3.14159. It is a great day to walk around in circles and eat pies. Pizza and fruit! Pi Day was founded back in 1988 and was officially designated by the House of Representatives in 2009. Founded by Larry Shaw, the first Pi Day took place in San Francisco, California when Larry and some of his coworkers at the Exploratorium got together to talk about math and eat pie on March, 14th. The event grew from there to became an official event at the museum. A parade was added and they sing Happy Birthday to Albert Einstein, who shares his birthday with Pi.
If you would like to find out more information about the Exploratorium, check out their website at http://www.exploratorium.edu.