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
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World Reef Awareness Day
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Snow buntings take flight
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Bonifacio on the island of Corsica, France
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Fall for Chile
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A fortress in the sky
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Waiting for winter
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Why does this panda cub look so happy?
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Martin Luther King Jr. Day
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Everybody loves World Turtle Day
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Can you see the family resemblance?
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Summer’s in home stretch
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Computer science on the page
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The buzz about bees
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Moving as one
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A water loch-ed castle
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Toledo, Spain
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Happy Thanksgiving from an expert face-stuffer
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Dancing in The Nutcracker
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Seasonal lights dazzle in Japan
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A Bengal tiger in Ranthambore National Park, India
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Palouse farmland, Washington state
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Happy Easter from the ‘peeps’ at Bing
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Poinsettia Day
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Sailing across the ice
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Honoring some real heroes of World War II
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National Bison Day
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Aloe in bloom
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A castle fit for a count
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Illuminating Annecy
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Cappadocia, Türkiye