So it’s March 14 again, and that means it’s time to celebrate everyone’s favorite irrational real number, Pi. Pi Day (and its slightly nerdier twin, Pi Approximation Day) are unofficial holidays marking the calendar’s trip past 3.14. (Pi Approximation Day is held on various dates related to Pi, like the 314th day of the year). On Pi Day, enthusiasts celebrate Pi by eating pie (or pizza), watching the movie Pi, playing ping-pong, or our favorite: memorizing just enough digits of Pi to outdo their calculator.
Pi Day is also Albert Einstein’s birthday.
via Mental Floss
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