How Primed Is Your Knowledge for Pi Day?

Happy Pi Day! 1 of 9

Pi Day, which falls on March 14, has become an annual celebration for delighted math lovers.

Larry Shaw of the San Francisco Exploratorium is credited with holding the first large celebration in honor of Pi Day back in 1988. Shaw, an Exploratorium physicist, organized a communal march around the Exploratorium's circular areas and capped it off with the now-traditional eating of tasty pies.