Tilda the orangutan, relaxing between gabfests at the Cologne Zoo. Cologne Zoo hide caption

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Cologne Zoo

From The Mouths Of Apes, Babble Hints At Origins of Human Speech

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Katherine Streeter for NPR

Researchers Watch As Our Brains Turn Sounds Into Words

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Language may have evolved in concert with tool making. Sergey Lavrentev/iStockphoto.com hide caption

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Sergey Lavrentev/iStockphoto.com