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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Commemorating peace in Antarctica
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You won’t see this on Mulberry Street
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In the Highlands for Saint Andrew s Day
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World Otter Day
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Kochia, Hitachi, Ibaraki prefecture, Japan
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Longtailed widowbird at Rietvlei Nature Reserve, South Africa
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Penguin Awareness Day
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Look before you leap
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New Zealand s loneliest mountain
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Kochelsee in Bavaria
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Avatars of the Wolf Moon
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Great cormorants
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Castle on a hill
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Splügen Pass, Switzerland
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In search of roadside attractions on ‘America’s Highway’
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European beech forest, Belgium
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America s Playground by Derrick Adams
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Midnight sun
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World Art Day
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Playa del Silencio, Spain
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Boxing Day—a shopper’s delight
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Fall comes to Pando
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Is that a face in the sand?
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Happy Star Wars Day!
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Happy Mother s Day
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A notorious advocate for women
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Celebrating National Park Week, April 21-29
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High tide at the walled city
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World Space Week begins
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Get the bear facts
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