When did Horizon Season 4 Episode 9 air?
Horizon Season 4 Episode 9 aired on May 9, 1967.
Horizon
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Season 4 · Episode 9
Memory
May 9, 1967·1h
Horizon explores the part of the human brain devoted to memory.
Episode FAQ
Direct answers for episode-level questions and details.
How long is Horizon Season 4 Episode 9?
This episode runs for approximately 60 minutes.
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