Mythbusters did a segment on this. They found that it had much more to do with how "wet" the food is. In other words, a dry cracker won't pick up many germs, no matter how long it lies there. Something like a slice of cucumber or piece of meat, however, will become quickly infested. They found that any germ transmission happens almost instantaneously.
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A truly open mind will seriously consider all points of view, even those with which it strongly disagrees for there may be a grain of truth in even the most ridiculous of opinions.
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