# Happy Pi Day 2016! (Galperin's method)

Numberphile also produced a video about it, and the NY Times Blog also gave a different derivation.

Here's a link discussing the math.

Basically, conservation of momentum and conservation of energy produce a system of equations that reduce down to stating that the the cosine of the number of collisions will change from positive to negative at an integer equal to [10^N*π], so the number of collisions will produce digits of π!