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It's Okay to Be Smart: Why Are We Warm Blooded?

11 minutes 18 seconds

Now Playing As: Captioned (English) (change)

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A human with the metabolism of a hummingbird would need to eat about 80,000 calories a day to survive. That’s because staying warm by making one's own heat takes a ton of energy. And that brings up a paradox because creating one's own body heat is incredibly expensive. Part of the "It's Okay to Be Smart" series.

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Runtime: 11 minutes 18 seconds

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