WEST PALM BEACH, Fla. (AP) — 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, savory or even pizza.

His journey with pi memorization began on Pi Day 2015 (3.14.15) when he became fascinated by the idea of reciting its endless digits. In just a few months, he memorized 600 digits. Vaughn’s progress came in waves — taking breaks for years before adding more.

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