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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World Environment Day
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At the shore of an inland sea
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Shark Awareness Day
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What s cuter than nuzzling rhinos?
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Pining for spring
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World Dolphin Day
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The Great Glen
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Carnival comes to Olinda
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International Polar Bear Day
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Waimea Canyon and Waipoo Falls, Kauai, Hawaii
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Celebrating World Olive Tree Day
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Agüero, Huesca province, Spain
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International Day of Peace
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Commemorating the life of a famous railroad conductor
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Great gray owls in their nest, Finland
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Paradise Cave, Phong Nha-Ke Bang National Park, Vietnam
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The Easter Bunny’s story
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Winterpret on ice
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The Belogradchik Rocks in Bulgaria
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Celebrating National Dentist Day
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It s Mountain Day in Japan
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Here, fishy!
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Looking back on 150 years of rail travel
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Welcome to the drainpipe of the Pacific
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Wildlife Conservation Day
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Welcome to the pack
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The moai you know
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It s leap day!
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International Day of the Worlds Indigenous Peoples
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St. Paul Winter Carnival
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