When did Horizon Season 6 Episode 20 air?
Horizon Season 6 Episode 20 aired on May 29, 1969.
Horizon
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Season 6 · Episode 20
Discovery
May 29, 1969·1h
Horizon reports on the research being carried out in the fields of botany, astronomy, biochemistry, meteorology, and zoology.
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Direct answers for episode-level questions and details.
How long is Horizon Season 6 Episode 20?
This episode runs for approximately 60 minutes.
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