I work in a grocery store and sometimes after like 30 mins of being idle one of the apples or potatoes in a pile will roll down. HOW?!??
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The container of salt on my kitchen fan would fall down now and then, because the vibrations from the fan and a gradually sloping surface. Other, smaller containers managed to stay away from the slope, but the salt, if noone used it and put it back, eventually moved so far out that it slid off.
Slightly squishy objects such as vegetables slowly settle if something is placed on top, meaning it can be stable for some time, but slowly get less stable until it falls. Empty plastic bags also often do this if placed precariously.
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