One day the Baron Munchausen found himself stuck in a mire together with his horse. The situation was dire, but he managed to save himself (and his horse!) by pulling his hair up until he was lifted out of the mud.
Obviously, Munchausen’s feat is impossible, as it violates the law of gravity. So it is fitting that it gives the name to the most compelling demonstration of the impossibility of another impossibility that human beings have been after for quite some time: certain knowledge.
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