It"s Pi Day, the day we celebrate the mathematical constant π. This day was chosen because today"s date, March 14, expressed numerically, matches the number"s first digits, 3.14. Pi represents the ratio of a circle"s circumference to its diameter. It can be used to compute the area and circumference of a circle, such as the circles that make up this bridge we"re looking at here in Copenhagen. (Who said math wasn"t useful in the real world?) Many people mark the day with activities based around mathematics—and most also serve pie. We can"t think of a more delicious way to study geometry.
A circular celebration
Today in History
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Antarctica Day
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A reflection of Europe s past
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National Napping Day
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Happy Independence Day!
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A fair that s star-studded
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National Llama Day
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Pollinator Week
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A state-of-the-art lookout on the Rock of Gibraltar
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Southern right whales sail home to South Africa
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A universe underground
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A peek behind the royal curtain
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Red squirrel in Cairngorms National Park, Scotland
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Finnish Independence Day
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Mountain goats
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International Literacy Day
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San Francisco’s City Hall illuminated by the iconic colors of Pride
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Glendurgan Garden hedge maze is 186 years old
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National Find a Rainbow Day
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Llama Day
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South Stack Lighthouse, Holy Island, Wales
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Cheers! It’s National Wine Day
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Porto, Portugal
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Exploring the wilder side of New York
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Skaftafell, Vatnajökull National Park, Iceland
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Salt ponds of Maras, Peru
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The largest American bison around
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A swim in the sky
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Autumn in Piedmont
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Celebrating World Wildlife Day
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Mount Hamilton, near San Jose, California