Long before pi had a name, people were drawn to its mystery. Every year on March 14, Pi Day highlights one of math"s most recognizable constants. The date reflects the first three digits of pi (π), the ratio of a circle"s circumference to its diameter: 3.14. Pi"s infinite, nonrepeating decimal has fascinated thinkers for a long time. The modern celebration began in 1988, when physicist Larry Shaw marked the day with a fitting tribute: serving pie.
Celebrating Pi Day
Today in History
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Tiny fliers head south
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Happy 50th for the National Trails System!
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Henningsvær Stadion, Norway
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A viewer with a view
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The (Inca) empire strikes back
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Flag Day
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A stunning national park in winter white
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Hooray, hooray, it s Unicorn Day!
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Svolvaer, Lofoten Islands, Norway
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A personal collection becomes an institution
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Reflecting on one of the world s strangest rivers
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Why you should thank a nurse today
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Stari Most in Mostar, Bosnia and Herzegovina
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Guilin and Lijiang River National Park, China
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Happy New Year!
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World Childrens Day
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