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March 14, also written as “3/14,” marks the beloved Pi Day. This made-up holiday honors “pi,” the mathematical constant that designates the ratio of a circle’s circumference to its diameter, which begins with “3.14.” It may sound nerdy, but it’s also a great day to subtract from your food bill. On Pi Day, several restaurant chains offer deals or freebies. Typically, these Pi Day deals are good for…
