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I don't really know what I'm talking about here but...

If two such devices were identical in every way and started from the same conditions (i.e: the sands were placed in the devices the exact same way) then over a sufficient amount of time the sand mixture in the two devices would reach an identical equilibrium state of mixing. At least that's how two gases would act. No idea about sand.

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Your "if" is pretty much untenable. Find me two identical sand particles.

Your argument basically boils down to "chaos theory is wrong, because I /can/ know everything".

It does not boil down to that I think. It was a good question which got enlightening answers.

It got one other answer, which was not terribly different.

Yes both good

Sure, eventually. At the same point in time that the monkeys produced "Hamlet" on a bunch of typewriters. The problem is the number of entry variables -- even if the starting position was X, the affects of gravity, friction, and general entropy would result in different states.

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