Pi belongs to a huge mathematical group called irrational numbers, which go on forever and cannot be written as fractions. Scientists have calculated pi to 105 trillion digits, although most of us are more familiar with the approximation 3.14. But how do we know that pi is an irrational number?

Pi Day, March 14th, when the date reads 3.14, might just be one of my favorite national food days. Personally, I'm not a "math person," but I am a baker who is never going to pass up an opportunity to celebrate with pie.