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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Chilling out on an ice floe
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Pancake Day
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Plitvice Lakes National Park, Croatia
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Camel thorn trees, Namib-Naukluft Park, Namibia
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Beauty beneath the surface
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Pier perfect
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Frosty Finland
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The Shard, London
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Everglades National Park, Florida, USA
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Black History Month begins
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A castle full of history
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Amber waves of grain
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Trooping the Colour
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The Gothic Gate in the Adršpach-Teplice Rocks, Czechia
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A prickly customer
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Moon Day
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A deadly coast
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Mesquite Flat Sand Dunes in Death Valley National Park, United States
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Have a merry little Christmas
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Shining city on the hill
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Eurasian red squirrel, Switzerland
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Edinburgh Castle, Scotland
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World Maritime Day
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Alam-Pedja Nature Reserve, Estonia
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World Donkey Day
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Green-crowned brilliant hummingbird
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Fit for a king
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Maasai giraffe mother with calf in the Serengeti, Tanzania
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Alpine Lakes Wilderness, Washington, USA
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Manatee Appreciation Day
Bing Wallpaper Gallery

