Calculating pi with darts

I love this one. Really, it's maths not physics, but there is a bit of experimental physics creeping in at the fringes when the experimenters realize that the first method is biased. The second method is much better designed. 

Regrettably, pi-day (March 14th, 2015, or 3.14.15) only works if you use the US system of recording dates.  But fear not,  e-day (2nd July 2018, or  February 7th, 2018 if you're American) isn't so far away…

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