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ABC - Every March 14, a date written numerically as 3/14 match the first three digits of the never-ending number known as pi: 3.14, mathematicians, scientists and math lovers around the world celebrate Pi Day. Pi Day was first celebrated in 1988 at San Francisco's Exploratorium, a museum of science and technology that encourages visitors to be hands-on. "Pi Day is such a special holiday for the Exploratorium," Samuel Sharkland, program developer at the museum, told ABC News. "It started off as a staff gathering and speaks to its magnetism and interest that it's blown up into an international celebration."

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