Learn with us online while the Exploratorium is temporarily closed. You can help us reopen—donate today.
Learn about the long and rich history of π.
Plumb the history of Pi Day—and its founder, Larry Shaw (pictured).
Measure acceleration with spaghetti and marshmallows.
Create lasting change when you support the Exploratorium's mission.
Learn about π, π Day history, and play with π activities.
Your health and safety is our top priority.
Friday, May 7, 2021 • 6:00 p.m. PDT
Join us on May 7 for our annual gala fundraiser, raising crucial support to sustain the Exploratorium during our closure.
Pi is just a little bit bigger than three. But exactly how much bigger?
Try these fun π activities at home.
Check out our FAQ, or contact us.
Celebrate Pi (π) Day wherever you are.
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San Francisco, CA 94111
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