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 recognisable 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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Grand Canyon National Park, Arizona, United States
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A starry night!
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Los Glaciares National Park, Patagonia, Argentina
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Secluded sands in Mexico
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Finding beauty in ruins
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Daylight Savings
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Zelenci Nature Reserve, Slovenia
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Park of the Monsters
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Red maple
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International Sloth Day
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Staying in the loop
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Perfect, pastoral Palouse
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Kodiak National Wildlife Refuge, Alaska
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Bohemian waxwings
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Go fly a kite!
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Happy New Year!
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Bláhver, Hveravellir, Iceland
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Spirit of the Puffing Wind
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Rapa Valley in Sarek National Park, Sweden
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Baia del Silenzio in Sestri Levante, Italy
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International Ice and Snow Sculpture Festival, Harbin, China
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Happy Valentines Day!
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International Day of Forests
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Pushkar Camel Fair
Bing Wallpaper Gallery

