1. A Talking Gorilla

1. A Talking Gorilla

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2. A Gorilla Who Lied

Koko is learning signs at lightning speed, and Penny’s getting all kinds of attention for her work. But defining language isn’t exactly straightforward. And now, the San Francisco Zoo wants Koko back. 

3. Uptown Chimp

A rival ape language experiment takes shape. Herbert Terrace, a psychology professor at Columbia University, moves a chimp into a brownstone, names him Nim Chimpsky, and hires an entire team to teach him sign language. Can a chimp create a sentence? 

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