Welcome to our 31st annual Pi Day! Help us celebrate this never-ending number (3.14159 . . .) and Einstein's birthday as well. On the afternoon of Monday, March 14, 2018, participate in pi-related activities and enjoy a piece of pie. If you can't join us in person, celebrate with us in Second Life.
Founded at the Exploratorium by our own Prince of Pi, physicist Larry Shaw, Pi Day has become an international holiday, celebrated live and online all around the world.
At the Exploratorium, Pi Day isn't just a day—it's a way of life. After all, we invented it! Experience this mathematical holiday any day of the year with this video.