[voice over] You know your tailbone? It used to be a tail. That pink part in the corner of your eye? It used to be a third eyelid. The appendix used to help us digest tough foods. Now it does nothing. The story of our evolution is the story of what we leave behind, what we’ve discarded. Our bodies only hang on to the things we absolutely need. The things we no longer have use for, we give up, we let go.
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