Pi Day Princeton, a celebration unlike any other! Albert Einstein's birthday is March 14 -- or 3.14, the numeric equivalent of Pi. Where better to commemorate this day than in the Ivy League town where Einstein lived for more than 20 years? On 3.14.15, we captured "The Ultimate Pi Day" celebration in its full glory to show that whether you live in Princeton or the surrounding area, you can always find something unique, interesting, and fun to do... Yet another reason why we love where we live!