As you may (or may not) remember from school, the value of Pi is 3.141592653..... It goes on and on forever. Every year, there are all sorts of people who celebrate Pi Day on March 14th. This year, though, is especially special, as it is the Pi Day of the Century. This year, the date lines up nicely with Pi (3.1415 = 3/14/15), plus March 14 is Albert Einstein's birthday, so we're going to celebrate with a Pi Day flash mob.