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Because sometimes museum guests aren't just pushing things too hard, they are actively taking steps to destroy things, just to see if they can get away with it.

Can confirm.

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If there is only two troublemakers in every group of 30 children, and a museum receives 10 groups a day, that’s 20 little rascals who are all trying to do the craziest stunt they can come up with…
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My wife worked in an aerospace museum for quite some time; I've heard a lot of similar stories.
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