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How Human Should A Gorilla Be?

Koko, seen here with Penny Patterson (left) at age 4 1/2 — nearly 40 years ago — was taught sign language. June Monroe, an interpreter for the deaf at St. Luke's Church who helped teach Koko, is in the center. (Bettmann Archive/Getty Images)
Koko, seen here with Penny Patterson (left) at age 4 1/2 — nearly 40 years ago — was taught sign language. June Monroe, an interpreter for the deaf at St. Luke's Church who helped teach Koko, is in the center. (Bettmann Archive/Getty Images)

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