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It's Okay to Be Smart
Why Are We Warm-Blooded?
Season 9
Episode 6
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 your own heat takes a ton of energy; creating your own body heat is incredibly expensive. So, why aren’t cold-blooded… like crocodiles? Here’s the science.
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