Horizon
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Season 4 · Episode 1 ·
Sons of Cain
Horizon probes into whether aggressiveness is our birthright and can society live without violence?
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Episode 1 of season 4 of Horizon: “Sons of Cain”. Aired 1967-01-17. Watch it online free on ZapFlix.