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

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,