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Among all great apes, only Homo sapiens showers its infants with babbling, cooing, and high-pitched “baby talk.” A new study shows just how rare—and recent—this trait may be.

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Human infants receive more directed communication than other great ape infants, indicating that it evolved alongside language.

Human infants receive more directed communication than other great ape infants, indicating that it evolved alongside language.

The way that human adults talk to young children is unique among primates, a new study found. That might be one secret to our species’ grasp of language.

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