Koko: The Gorilla Who Talks
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In 1971, Penny Patterson began teaching sign language to a gorilla, unaware that this relationship would define both their lives. (Also Sat. 8/6 at 6 p.m.; Sun. 8/7 at 3 p.m.; Tue. 8/9 at 2 a.m.)
Aired: 08/03/16
Expired: 08/03/16
