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. This tasty-sounding constant 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—a celebration of both the mathematical constant π and its delicious homophone, pie. It began in 1988, when physicist Larry Shaw connected the date (3/14) with the first three digits of this constant. 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 in 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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Registan Square, Samarkand, Uzbekistan
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A window to the Pacific
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Camels in the desert, United Arab Emirates
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Glenariff Forest Park, County Antrim, Ireland
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Squirrel Appreciation Day
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World Octopus Day
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Boreal owl
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International Day for Biosphere Reserves
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International Chameleon Day
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Yoho National Park, British Columbia, Canada
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Hiding in the woods
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Holding back the tide
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Her legend and mystery endure
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Farewell Ma’am
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Teddy bears of the sea
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World Teachers Day
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Common raven
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Picture perfect
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World Art Day
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National Winnie-the-Pooh Day
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West Cornwall Covered Bridge, Connecticut, USA
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Doves of peace
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Mothering Sunday
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Spring equinox
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Green shoots
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Ring of Brodgar, Orkney, Scotland
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A day for cousins of every stripe
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Snowy egret preening, Florida, United States
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Castle in the sky
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Dalmatian pelicans, Lake Kerkini, Greece
Bing Wallpaper Gallery

