Humans are known to invent private hand gestures. Chimps in the wild do, too, a new study suggests. By Brandon Keim Parents and their children, or people who know each other well, often share some ...
SLRA copy 39088009263385 has bookplate: Smithsonian Institution Libraries, Gift in memory of Martin H. Moynihan, Founding Director of STRI. A Cross-Fostering Laboratory / R.A. Gardner -- Voiced and ...
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