Today Is the 30th Anniversary of Pi Day. Here’s What to Know About the Mathematical Holiday

March 14 is Pi Day — that’s pi, not pie — and today, Google marks the 30th anniversary of the math-inspired holiday with a special Doodle.

Pi, denoted by the Greek letter “π”, has been part of human knowledge for millennia, but it wasn’t until 1988 that physicist Larry Shaw organized what is now recognized as the first “Pi Day” celebration at the San Francisco Exploratorium science museum. Shaw chose March 14, or 3.14 — the first three digits of pi — as the holiday.

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