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Video: On Pi Day, San Francisco celebrates. On March 14 at 1:59 PDT, it was a celebration of all things Pi: 3.14159... CNET News.com's Kara Tsuboi stops by the geek fest at San Francisco's Exploratorium museum to take part in a Pi procession, meet a baby named Pi, and of course, have a slice of the sweet stuff for dessert.

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