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But there is also another "natural" model. A deaf, non-literate observer approaching the planet from outside and reporting on crucial aspects of human appearence and behavior, would conclude with some confidence that men speak a small number of different, though probably related, tongues. He would guess at a figure of the order of half a dozen with perhaps a cluster of dialects or pidgins. This number would be persuasively concordant with other major parameters of human diversity. Why, then, the mystery of Babel?