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Vsauce: Why do we have two nostrils? And what is smell?

Humans are not alone in the animal kingdom to have two nostrils  actually quite the opposite. As with dogs, domestic cat’s sense of smell is far superior of that compared to a human; about fourteen times as strong as a human’s.

Vsause asks the question; why do we have two nostrils? The answer may surprise you. And talking about our nose and the ability of smelling, what does space smell like? And what do you call someone that cannot smell?

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