It’s the early 1970s, and grad student Penny Patterson sets out to investigate a big question: is language a uniquely human skill? So she begins an ambitious experiment -- with the help of a young gorilla named Koko. Pretty soon, Penny says Koko is learning sign language. But some doubt Penny’s version of events.To learn more about listener data and our privacy practices visit: https://www.audacyinc.com/privacy-policyLearn more about your ad choices. Visit https://podcastchoices.com/adchoices