How did humans first learn to talk? Early linguists proposed some delightfully silly-sounding theories. According to Live Science, there's the 'Bow-Wow' theory — that language mimicked animal sounds — the 'Ding-Dong' theory, suggesting sounds naturally resembled their meanings, and the 'Pooh-Pooh' theory, which credited emotional grunts as language's birthplace. While the names are amusing, the ideas represent serious attempts to explain humanity's most fundamental leap. Yet after centuries of study, scientists still haven't nailed why language actually evolved.

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