We all remember Rebecca Black. Oh, do we remember. She sang "Friday," that awful but irresistibly catchy tune (viewed 105 million+ times on YouTube!!), which will forever be a part of our culture. Had she sung about Pi Day, however, perhaps the song would have had a more positive reception.

Today, March 14th (3/14), is Pi Day, because the mathematical number pi is rounded off to 3.14. Pi is an irrational number (meaning it cannot be adequately expressed as a fraction of two whole numbers) that is derived by dividing the circumference of a circle by its diameter. 

Pi: Not Just Another Number

Pi is much more than a mathematical curiosity. The number comes up over and over again...