This March 14 is a very special Pi Day that comes but once in a century. That's right, it's 3-14-15, the only time before 2115 that the date reflects five digits of the magical, infinite number ...

March 14 marks Pi Day, an annual celebration of the mathematical constant pi (π). Whether you can recite the first 100 digits of the sign or simply love eating pie, here's how to celebrate Pi Day ...

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.