Why do we have kneecaps on our legs but no “armcaps” on our arms?
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It would be elbowcaps, and we don’t have them because we didn’t evolve that way, simply put. The elbow is a better joint, but it doesn’t have to support as much pressure, so it doesn’t need to be so complicated. Kneecaps are certainly overcomplicated, but that’s evolution for you.
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