Pi Day: five fun facts about 3.14

March 14, or 3.14, is Pi Day. Get it? Pi Day celebrates all things related to the mathematical constant that measures the ratio of a circle's circumference to its diameter. Here are five things you should know about π. 

5. Happy birthday, Albert Einstein!

AP Photo/File
Legendary physicist Dr. Albert Einstein, author of the theory of Relativity, is shown in this undated file photo.

March 14 is also Albert Einstein’s birthday. The German theoretical physicist was born in 1879 and died in April 1955. Often regarded as the father of modern physics, Einstein is, of course, best known for his mass-energy equivalence formula or E = mc2 . In 1921, he received the Nobel Prize in Physics for his services to theoretical physics and especially for his discovery of the law of the photoelectric effect, which was crucial in establishing quantum theory within physics. Though there are no concrete connections linking Einstein and pi, we feel it's worth mentioning those two in the same sentence. 

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