Math geeks and school children everywhere are wishing each other a Happy Pi Day today: that's right, it's March 14th, or 3/14, the first three digits of the mathematical constant π, which represents the ratio of a circle's circumference to its diameter. (Math geeks everywhere are also scoffing at the Saganian/Aronofskian notion that the numbers in pi reveal some esoteric, kabbalistic secret, while those school children are all happy just to be measuring and then eating pies they brought in to class). more ›