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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Kendwa village, Zanzibar, Tanzania
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Baby giant panda in China
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May the 4th be with you
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An island park
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London Marathon
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Walton Lighthouse, Santa Cruz, California, USA
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King of the jungle? Nope
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Gollinger Waterfalls, Salzburg, Austria
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World Turtle Day
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Arches National Park, Utah, United States
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Hogmanay
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Fit for a king
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So good, they built it twice
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Fujian Tulou, China
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Saint Georges Day
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Protecting the gentle giants
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International Talk Like a Pirate Day
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Strong sibling bonds
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Kirkilai lakes, Biržai Regional Park, Lithuania
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World Elephant Day
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Snæfellsnes, Iceland
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World Penguin Day
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Bring the king cakes
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Sea otters
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Noah Beach, Queensland, Australia
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Labor Day
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Notting Hill Carnival
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A sea of humanity
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Santa slalom
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Celebrating Charles Darwin