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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, which is the ratio of a circle's circumference to its diameter, is celebrated with its own holiday on March 14.

Math fanatics from all around the world and everyone else who just loves ancient Greek pi (or pie) celebrate on March 14.

Each year, on March 14, it's become traditional for numerophiles and mathematicians to pause and reflect on the most famous ...