Pi Day 2026 arrives this Saturday, March 14, celebrating the mathematical constant 3.14. The 2026 theme is 'Mathematics for a Sustainable Future,' highlighting the role of math in environmental science. Occurring on Albert Einstein's birthday, the day is marked worldwide by pie-eating, recitation contests, and STEM outreach. Coincidentally, March 14 is also the anniversary of the passing of Stephen Hawking, who died in 2018.
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