Happy Pi Day from the Pi Guy

41 Dozen Numbers of Pi

Math lovers celebrate March 14 (or "3-14") as Pi Day.

The Greek letter pi represents the mathematical constant that equals a circle's circumference divided by its diameter. The world's most famous irrational number is usually shortened to 3.14 — but not for Marc Umile.

In January, the 40-year-old from Upper Darby, Pa., became the North American record-holder for memorizing pi: He made it to the 12,887th digit.

Umile says he has always been fascinated with human memory.

"For anybody who wants to know how good their memory is, pi is the ultimate test of finding that out," Umile tells Robert Siegel.

A love of music helped Umile memorize the digits of pi. He says he separated the numbers into clusters of 2, 4 and 6, and he also recorded himself reciting pi, and listened to it repeatedly.

Web Resources



Please keep your community civil. All comments must follow the NPR.org Community rules and terms of use, and will be moderated prior to posting. NPR reserves the right to use the comments we receive, in whole or in part, and to use the commenter's name and location, in any medium. See also the Terms of Use, Privacy Policy and Community FAQ.