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Only 3.14 More Shopping Days Until Pi Day.

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The "Giant Pi drop" attracts thousands of math fanatics as they celebrate the calendar representation of pi, 3.14159, at at 1:59 on March 14 at pidayinternational.org. (MathematiciansPictures.com)

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Larry Shaw, the father of Pi Day, leads a pi parade at the Exploratorium science museum in San Francisco on March 14, 2008. (Photo by Amy Snyder/Exploratoriu)

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Pi, the infinite number created by dividing the circumference of a circle by its diameter, has captivated thinkers from Newton to Einstein. Now it is cause for celebration. All over the country, thousands will pause on March 14, or Pi Day, to whoop it up.


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