Happy Pi Day! Fans have decided to commemorate the mathematical constant on March 14 for years, but it was until 2009 that Pi Day was designated by the U.S. House of Representatives. For those who don ...

Feeling a little more circular than usual today? That’s because 14 March, which is 3.14 in the US date format, is pi day. Enjoy this year’s festivities, for dark clouds may be gathering on the horizon ...

March 14 is Pi Day, a chance for people around the world to celebrate everyone's favorite mathematical constant "π" (pronounced like the word "pie.") Pi is an incredibly important number in many ...