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[Stefan Koch]

On Wednesday, 17 October 2018 at 21:12:49 UTC, Stefan Koch wrote:
> [another person] cannot actually occupy the same space. It is 
> physically impossible.

Actually, that's not quite true, If they were to try hard enough 
the result would be nuclear fusion, (I am guessing (I am not a 
phsysist)), in any case it would certainly mess up
  the state of everyone involved; which is exactly what happens 
win multi-threaded situations.