Horizon
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Season 9 · Episode 3 ·
How Much Do You Smell?
Why do humans have such a poor sense of smell as compared to animals? Horizon investigates why.
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Episode 3 of season 9 of Horizon: “How Much Do You Smell?”. Aired 1972-01-17. Watch it online free on ZapFlix.