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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Squirrel Appreciation Day
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Maya site of Copán
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Kochia, Hitachi, Ibaraki Prefecture, Japan
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SantaPark, Lapland, Finland
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A braided river
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Bryce Canyon hoodoos in winter
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Short-beaked echidna, Adelaide Hills, Australia
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Yungang Grottoes, Datong, China
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Merry Christmas!
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Khao Sok National Park in Thailand
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American bison, Grand Teton National Park, Wyoming
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Celebrating the tropics
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Small but mighty
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High above the Aegean Sea
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Ahead of the curve
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Walruses in Svalbard, Norway
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Muir Woods National Monument, California, United States
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Brown bear, Katmai National Park, Alaska, United States
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Bears Ears National Monument, Utah, United States
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Easter Sunday
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Gemsboks in the savannah, Botswana
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We’re all smiles for World Hippo Day
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Methoni Castle, Messinia, Greece
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South Downs Dark Skies Festival
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International Talk Like a Pirate Day
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Saint Paul Winter Carnival
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Art installation of umbrellas, Borough Market, London, England
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A show of prehistoric hands
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World Oceans Day
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Village of Saranac Lake, New York, United States
Bing Wallpaper Gallery

