Horizon
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Season 16 · Episode 3 ·
The Keys of Paradise
Horizon follows the discovery of a chemical in the brain which has morphine-like properties.
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Episode 3 of season 16 of Horizon: “The Keys of Paradise”. Aired 1979-03-12. Watch it online free on ZapFlix.