When did Horizon Season 22 Episode 13 air?
Horizon Season 22 Episode 13 aired on April 15, 1985.


Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Horizon examines a hypothesis that life itself manipulates the planet to enhance it's own survival.
Direct answers for episode-level questions and details.
Horizon Season 22 Episode 13 aired on April 15, 1985.
This episode runs for approximately 60 minutes.
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