Math enthusiasts around the world, from college students to rocket scientists, celebrate Pi Day, which is March 14 or 3/14 — the first three digits of an infinite number with many practical uses. Many people will mark the day with a slice of pie — sweet,

Sure, it's a nod to 3.14, the never-ending number that describes a circle's circumference, but the reason people show up for it each year isn't because they're