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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Armbrug bridge, Amsterdam, Netherlands
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The Bahamas
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A kiss and a sigh
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Dragon tails trail to the sea
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You can take a refreshing dip here any day of the year
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African elephants in Namibia
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Blurring the lines with wearable art
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Gujō Hachiman Castle, Gifu Prefecture, Japan
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New Years Eve in Ottawa
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World Meteorological Day
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Chittorgarh Fort, Rajasthan, India
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Vancouver International Boat Show
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Ayutthaya Historical Park, Thailand
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Holiday hues
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If these walls could talk...
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Shark Fin Cove, California
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Computer Science Week
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Sandhill cranes, Bosque del Apache National Wildlife Refuge, United States
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Bamburgh Castle, Northumberland, England
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American bison
Bing Wallpaper Gallery

