The reason why one should wrap a door knobs in aluminum foil when one is home alone is to hinder (prevent) the door from latching.
An Aluminum foil is known to be a type of foil that helps to give a surface or object a form of full barrier against light, oxygen, etc.
Note that the foil is often used in food and also in pharmaceutical and the reason why one should wrap a door knobs in aluminum foil when one is home alone is to hinder (prevent) the door from latching.
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