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Watch Horizon Season 48 Episode 5 online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

Horizon: Speech is a phenomenon unique to humans yet it still remains a mystery. Horizon meets a father who is filming every second of his sons first three years in order to discover how we learn to talk the autistic savant who can speak more than 20 languages and the first scientist to identify a gene that makes speech possible. There is also a look at the theories of the godfather of linguistics Noam Chomsky and a unique experiment showing how a new language can emerge in just one afternoon.