Did Neolithic humans build this structure to celebrate Pi Day? Not likely. Pi Day is a relatively recent phenomenon—invented by a physicist in 1988 and designated by Congress a national holiday in 2009. But it"s already almost certainly the most popular holiday celebrating a mathematical constant. While Pi Day is a young tradition, the number π (pi) itself has been a fascination since antiquity, when it was first calculated as the ratio of a circle"s circumference to its diameter.
Pi Day
Today in History
More Desktop Wallpapers:
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An oceanic valentine
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A gentle wind fills this sail
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Keep your hands inside the ride at all times…
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Earth at Perihelion
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The persistence of Perito Moreno
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Life in the slow lane
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A day to celebrate the sun
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Is that a buzzing sound?
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A Carpathian Christmas celebration
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Celebrating Mexico in a Cultural Capital
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AAPI Heritage Month & Lei Day
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From Sputnik to extraterrestrial storms
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Everest s shadow on the Himalayas
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A day for the dolphins
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Albion Falls, Hamilton, Ontario, Canada
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Summertime in Alaska
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International Womens Day
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American bison, Grand Teton National Park, Wyoming
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Skyscraper Day
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The Canary Islands, Spain
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Norway s Kjeragbolten boulder
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Burns Night
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Tegallalang terrace farms in Ubud, Bali, Indonesia
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Happy Father s Day
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South Beach in Miami Beach, Florida
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The cycle begins anew
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World Space Week
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Gifford Pinchot National Forest
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World Maritime Day
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Protecting endangered giants