I was at a friend's house, and she left some cheese sitting out, I don't remember what kind (maybe mozzarella?) and I rushed to put it back in the fridge so it didn't spoil. She insisted that cheese never goes bad, "it just turns into another kind of cheese."
Is this necessarily true? Are there some cheeses that, after too long, become inedible? (I don't mean as a matter of taste, I mean to the point of making one ill.)
Also, for my cheesy edification, can you list some well-known cheeses that, when left in a warm dark place, turn into another kind of edible cheese? Or are there some that are good indefinitely, as long as you scrape the exterior mold off?
Thanks for your help!