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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Labor Day parade in 1915 Chicago
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First day of summer
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How Quảng Ngãi got its grove back
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The aftermath of a meteorite
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World Environment Day
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Methow Valley, North Cascades, Washington
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A shell of many colors
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Native American Heritage Day
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World Chocolate Day
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Silent night, sparkling lights, and hearts full of joy
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From the mind of Frank Gehry
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Vineyards in the Mosel Valley, Rhineland-Palatinate, Germany
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International Lighthouse Lightship Weekend
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Going with the floe
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Irohazaka road
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Bringing together history and technology
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Cross this bridge if you dare
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World Giraffe Day
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International Geodiversity Day
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Celebrating sea otters
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International Whale Shark Day
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Fox kits
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Lake Bled, Slovenia
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A toast to California!
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Jupiter and the Galilean moons
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Prague, Czech Republic
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Endangered Species Day
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The circular castle of Cornwall
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Happy Lunar New Year!
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