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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Ancient art in the Amazon
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World Rhinoceros Day
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Poppies in bloom
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International Talk Like a Pirate Day
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Meet our fuzzy Earth Day mascot
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Quiver trees, Keetmanshoop, Namibia
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Ljubljana, Slovenia
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Siblings Day
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Napping away New Year s Day
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Ardez, Graubunden, Switzerland
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Visiting Ahch-To on Star Wars Day
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World Theater Day
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World Migratory Bird Day
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Darwin s Arch
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Canada s $20 view
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Skyscraper Day
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Bald cypress trees in Georgia
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A dying breed of tree thrives in an American park
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The Colosseum of Rome, Italy
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Nazaré Lighthouse
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National Trails Day
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Stop and see the flowers
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Porto Flavia, Sardinia, Italy
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Design for Each and All
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International Day of Human Space Flight
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Male hooded merganser, Oregon
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SantaPark, Lapland, Finland
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Let s get lost
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Where fire meets water
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National Find a Rainbow Day
Bing Wallpaper Gallery

