Cheese is cheese because it is mouldy. Besides, food is only spoiled because decomposers move in, it's not some ethereal property of perishables that they become no good to eat purely because of their age. As soon as food is exposed to the open air, they begin decomposing, you just can't see it yet. As I say, we have no problem eating all the bacteria and hyphae that swarm our foods, but once a few stolon specks appear, oh noes!
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