Add Yahoo as a preferred source to see more of our stories on Google. Beyond the fact that March 14 works out to 3.14, the mathematical equivalent of pi (π), pizza restaurants big and small celebrate ...

Every year on March 14, millions of people celebrate Pi Day. This fun holiday honors Pi, the number (3.14) that represents the ratio of a circle's circumference to its diameter. And this year, several ...

Although it isn't an official day on the calendar, Pi Day is one of the most anticipated holidays of the year. Sure, it might not come with copious amounts of presents or some mystical lore ...