The famous German-born theoretical physicist, developer of the general theory of relativity, Mr Albert Einstein would be celebrating his 134th birthday today, had he not died in 1955.
Coincidentally, Einstein`s birthday falls on Pi day. What the hell is that, you are wondering...
Basically, it is the celebration of "The number π is a mathematical constant that is the ratio of a circle's circumference to its diameter, and is approximately equal to 3.14159."
No surprise that this concept is American! It is using their date format that the chosen day for celebrating Pi is 14 March - 3/14.
Across the States, especially at universities, they organize Pi and Einstein tributes, whereby in turn American fashion, they eat pie and dress up.