I know, I know, I've been on a three month hiatus from blogging. Sorry. I will get back in the game sooner rather than later. In the meantime, though, here is a great mosaic by Toltomeja in celebration of Pi Day (3-14). Pi is the constant ratio of a circle's circumference to its diameter. It is an irrational number that equals approximately 3.14159, and it shows up as a constant all over math and science.