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00:30:00
Meet Pi Day founder Larry Shaw, and join hosts Ron Hipschman and Lori Lambertson to find out what���s so special about pi���the irrational number that results from dividing the circumference of a circle by its diameter. Learn the history of pi and how pi is calculated, be entertained by pi limericks, and see a cool pi demo. Pie.

00:00:46
Celebrate Pi Day��� an international holiday born at San Francisco���s Exploratorium. Join us for a live webcast where we examine the nature of everyone's favorite mathmatical constant, 3.1415926535���ad infinitum!

00:38:06
Celebrate Pi Day��� an international holiday born at San Francisco���s Exploratorium. Join us for a live webcast where we examine the nature of everyone's favorite mathmatical constant, 3.1415926535���ad infinitum!

01:53:32
The Exploratorium celebrates the 20th anniversary of Pi Day with a pie-throwing contest, Pi Day exhibits in Second Life, and more activities honoring everyone's favorite mathematical constant.

00:04:05
3/14 at 1:59 pm It's also Einstein's Birthday From San Francisco to New York, in museums, universities, classrooms and in the privacy of one���s own home - and of course on Second Life - people are celebrating Pi. In 2008, we celebrate the 20th anniversary of Pi Day, an international holiday born at San Francisco���s Exploratorium.