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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World Meteorological Day
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Whangārei Falls in New Zealand
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Who s wearing such cute hats?
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One for the books
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You won’t see this on Mulberry Street
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Autumnal equinox
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Tambopata National Reserve, Peru
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Pasadena Chalk Festival supports local arts education
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To Sua Ocean Trench
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Incense making, Vietnam
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National Park Week: Olympic National Park, Washington
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Spreadsheet Day
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Flooded crypt, Basilica of San Francesco, Ravenna, Italy
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Class, please take out a No. 2 pencil…
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Celebrating World Olive Tree Day
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Welcome to Scotland s garden
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Frog Month
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Storks ready for takeoff
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Tibetan New Year
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Chicagohenge
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First day of National Park Week
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San Blas Islands, Panama
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Florentine garden brings generations together
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Mendenhall Glacier, Alaska
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That bill s just not going to fit
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Tree of many colors
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Wheels up in Beijing
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Sami lavvu structures, Finnmark, Norway
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Apple trees in spring, Germany
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Azaleas blooming on Hwangmaesan Mountain, South Korea
Bing Wallpaper Gallery

