They say the only constant in life is change. In mathematics, however, there are many constants and today, we"re celebrating perhaps the most famous of them all: pi. Represented by the symbol π, this tasty-sounding number is the ratio of a circle"s circumference to its diameter, approximately 3.14159. Every March 14, mathematics fans across the world get baking to mark Pi Day with a pie. It began in 1988, when physicist Larry Shaw connected the date (3/14) with the first three digits of π. Today, mathematicians and enthusiasts celebrate Pi Day with pie eating and pi reciting. Did you know that when your clock strikes 1:59 today, you will be three decimal places closer to the real value of pi? Pi is everywhere, even in nature. Pictured here is a bodhi tree which has grown over an arch into the shape of the pi symbol at Wat Phra Ngam, a temple in Ayutthaya, Thailand. Whether you"re a math geek or just in it for the treats, Pi Day is for everyone to enjoy!
Happy Pi Day!
Today in History
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Who created the Easter Bunny?
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World Migratory Bird Day
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Women s History Month
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Blue linckia sea stars in Papua New Guinea
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Sundance Film Festival
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Cloudy with a chance of enlightenment
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Groundhog Day arrives—beyond a shadow of a doubt
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A growing business
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Porto Cathedral, Portugal
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It’s Art Deco Weekend in Miami
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Cheetah mother and cub
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Pollinator Week
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A dramatic view of Sicily
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International Mountain Day
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Demoiselle cranes, India
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Storks ready for takeoff
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Red squirrel
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Salar de Uyuni in Bolivia
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Edinburgh festivals
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Can you see the family resemblance?
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Up, up, and away for Hot Air Balloon Day
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Rooftops in the walled city of Urbino, Italy
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On the wings of the Wright brothers
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International Geodiversity Day
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A summertime light show
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Waitangi Day in New Zealand
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In Sicily, history is everywhere
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Vote!
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World Rivers Day
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Val Gardena, South Tyrol, Dolomites, Italy
Bing Wallpaper Gallery

