When did Horizon Season 21 Episode 11 air?
Horizon Season 21 Episode 11 aired on April 9, 1984.


Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
In the documentary, Horizon reports on the life of slime moulds and how they provides clues to cell differentiation.
Direct answers for episode-level questions and details.
Horizon Season 21 Episode 11 aired on April 9, 1984.
This episode runs for approximately 60 minutes.
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