"Reports that say that something hasn't happened are always interesting to me, because as we know, there are known knowns; there are things we know we know. We also know there are known unknowns; that is to say we know there are some things we do not know. But there are also unknown unknowns—the ones we don't know we don't know..." (Rumsfeld)
Fact is we never know and--short of totally destructive methods that render the question moot--we are just debating the best way to guess.
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