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
More Desktop Wallpapers:
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Autumn in Central Park, New York
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Cherry blossoms at the National Mall, Washington, DC
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Crown Fountain by Jume Plensa at Millennium Park in Chicago
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Spring equinox
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Night of the ‘Cold Moon’
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Spring comes to Glacier National Park
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Here s looking at you
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At the foot of Dubrovnik s Gibraltar
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Boxing Day
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Tigh Mor Trossachs on Loch Achray, Scotland
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A bison preserve
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National Mushroom Month
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World Children s Day
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Mountain hare hopping into Lunar New Year
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Cinco de Mayo
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Winter solstice
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Feeling crabby?
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Life goes on at the Beatles Ashram
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A stunning national park in winter white
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Moving as one
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Duck, duck. duck, duck, duck...
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Pitigliano, Tuscany, Italy
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A throng of ice and spires
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It s Census Day—make it count
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Salmon return to the Copper River
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Take the stairs
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A growing business
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Engineering an artificial harbor in Normandy
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World Sea Turtle Day
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Leshan Giant Buddha, Sichuan, China
Bing Wallpaper Gallery

