Thu, Mar 14, 1–3 p.m.
Exploratorium (in front of Pier 15)
Take an afternoon to delve into the never-ending number pi. The Exploratorium will feature actual slices of pie, a pi parade, and even skywriting the first 1,000 numbers in pi’s sequence – 10,000 feet in the air.
Free, 415-528-4360, www.exploratorium.edu