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NY Times blog post about this problem:
The original paper by Gregory Galperin:
~lebed/Galperin. Playing pool with
Evidently, Numberphile also described this problem (I had not known):
You’ll notice that video has an added factor of 16 throughout, which is not here. That’s because they’re only counting the collisions between blocks (well, balls in their case), and they’re only counting to the point where
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