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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The long and wiggling path
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Sand, sun, and sk8ers
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International Womens Day
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Art in the chapel
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National Hug Day
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Spine-cheeked anemonefish in Milne Bay, Papua New Guinea
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Cousins Day
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World Giraffe Day
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A wonder in winter
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Road to Hana, Maui, Hawaii
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Fujian Tulou, China
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The mountain of 30,000 sakura
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Tall, taller, tallest
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3, 2, 1 … Happy New Year!
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National Mushroom Month
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Sweet! It’s maple syrup season
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Vote!
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The mountaintop of toppled gods
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Ministry of Fun Santa School
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Groundhog Day
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Birds and bees, and why they re so important
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Hay, what s up?
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Tambopata National Reserve, Peru
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World Childrens Day
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The largest American bison around
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Bobbio, Italy
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Corona Arch near Moab, Utah
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Glacial rivers in Iceland
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Veterans Day
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Celebrating Madagascar on its Independence Day
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