When you think about holiday pies, Thanksgiving and pumpkin flavoring probably spring to mind. But there's another holiday that offers an even better excuse to indulge in pie: Pi Day, celebrated ...

Pi Day is celebrated today, 14 March, round the world. Pi (Greek letter π) is the symbol used in mathematics to represent a constant — the ratio of the circumference of a circle to its ...

March 14 is Pi Day, which gives you a hint to the start of the irrational number that is central to a lot of mathematics. In a video, Duke students competed to provide the longest string of Pi digits.