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Stream the full Horizon Season 30 Episode 20 movie online for free in crystal-clear HD quality. No downloads required—just press play and enjoy the action, complete with English subtitles for an enhanced viewing experience.

Horizon: This documentary by Horizon looks back into the 1980's where the work of pioneer researchers trying to determine if chimpanzees could understand language was attacked as charlatanism. Now the public opinion has moved back in favor of the idea that apes can indeed talk to us. The program looks at the latest developments in the chimpanzee language laboratories in America.