Using neutral expressions and safety

Most of us could look at a decades-old yearbook and recognize many of the faces of our former classmates -- but humans aren't the only ones with this remarkable ability. Laura Simone Lewis, PhD, of the University of California, Santa Barbara, discusses her research on the long-term social memories of chimpanzees and bonobos, including a bonobo who remembered family members after 26 years apart. She explains how these great apes navigate their social worlds and what they can teach us about the evolution of our own social cognition.

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