March 14th, or 3/14 is recognized by mathematicians as "Pi Day." Pi is the ratio of a circle's circumference to it's diameter, or roughly 3.14. Math teachers use Pi Day as a way to inject a bit of fun into their lessons. Pi Day is also the birth anniversary of the great physicist/mathematician Albert Einstein.

Einstein was born on March 14th, 1879 in Ulm, Germany. He won the Nobel Prize in 1921 and is probably most famous for his Theory of Relativity. He passed away in 1955 in Princeton, New Jersey. Einstein was quite familiar with "pi", and I would imagine that he also enjoyed pie.