Happy Pi Day! Here's a photo collection of Pi Day festivities hosted by the Exploratorium, where the holiday was first conceived. The day celebrates the wonders of this mathematical phenomenon.
See the Best Photos From Pi Day at the Exploratorium
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Thousands gather, chronologically holding the the first numbers of Pi, on Pi Day at the Exploratorium in San Francisco, Calif., on March 14, 2018. The group circled around the Pi shrine 3.14 times before returning inside to eat pie. (Lauren Hanussak/KQED)