When warm, moist air cools it exerts less pressure (ie, causes a partial vacuum). Dunk them in some hot water for a while and the trapped air should get back to normal pressure.
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Note, if I've gotten any facts wrong in the above, just ignore any points I made with them
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Originally Posted by FbodFather My sister's dentist's brother's cousin's housekeeper's dog-breeder's nephew sells coffee filters to the company that provides coffee to General Motors......
........and HE WOULD KNOW!!!!
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