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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Avalanche Lake Trail at Adirondack High Peaks, New York, United States
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Happy Holi!
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Snow glow
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Paralympic Games begin in Paris
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Brown pelican, San Diego, California, United States
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Happy St Andrews Day!
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More of a moustache than a beard?
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A day of swing and celebration
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Maasai giraffe mother with calf in the Serengeti, Tanzania
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Wintry Swiss bliss
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A remote oasis in Texas
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Yi Peng lantern festival, Chiang Mai, Thailand
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Juvenile manatees, Crystal River, Florida, United States
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A triumphant pose
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Twinkle twinkle, little bugs
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Regal Radiance
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A mile-high island
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International Archaeology Day
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Least chipmunk, Kootenai National Forest, Montana, United States
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International Dark Sky Week
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Boxing Day
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A hiker’s dream
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50 years of the Endangered Species Act
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Wasson Peak, Saguaro National Park, Arizona, United States
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Cave Dale and Peveril Castle, Derbyshire
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The grass looks greener on this side
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Italica, an old Roman city in Santiponce, Andalusia, Spain
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Earth Day
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European Day of Parks
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The Nutcracker performed by the Turkish State Opera and Ballet in Ankara
Bing Wallpaper Gallery

