Today is Einstein’s birthday, as well as Pi Day.

Albert Einstein’s birthday as well as Pi Day is March 14.  Einstein, born in 1879, was the celebrated mind that gave us the theory of relativity and E = mc².

The mathematical constant π or pi expresses the ratio of any Euclidean circle’s circumference to its diameter.  Its decimal representation never ends and never repeats (though it is commonly abbreviated to 3.14).

Princeton has celebrated the 14th with pie and an Einstein look-alike contest.