Horizon — Season 9
S09E031972-01-1760m
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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S09E03 — How Much Do You Smell?
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Why do humans have such a poor sense of smell as compared to animals? Horizon investigates why.
Ready to watch
Auto-selects the best quality source for you