Sound reasoning is the basis of winning at argument. Logical fallacies undermine arguments. They are a source of enduring fascination, and have been studied for at least two-and-a-half millennia. Knowledge of them is useful, both to avoid those used inadvertently by others and even to use a few with intent to deceive. The fascination and the usefulness which they impart, however, should not be allowed to conceal the pleasure which identifying them can give.
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