When did Horizon Season 9 Episode 3 air?
Horizon Season 9 Episode 3 aired on January 17, 1972.


Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Why do humans have such a poor sense of smell as compared to animals? Horizon investigates why.
Direct answers for episode-level questions and details.
Horizon Season 9 Episode 3 aired on January 17, 1972.
This episode runs for approximately 60 minutes.
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