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Story summary
- Pi Day is celebrated on March 14 to honor the mathematical constant ?.
- The observance began in 1988 when physicist Larry Shaw organized it at the Exploratorium in San Francisco.
- In 2009, the U.S. House of Representatives declared National Pi Day.
- UNESCO designated March 14 as International Mathematics Day in 2019 to promote mathematics in addressing global challenges.
- For 2026, the theme is "Mathematics and hope."
