Odd things, knees, when you think about it. At some point in evolutionary history, nature decided that instead of walking on a single, rigid stick, life would be better if we broke the stick in the middle and made it floppy, and then had to have a complicated system of muscle and tendons and ligaments to make it all go straight again. Why? If a straight leg was too long, surely the answer was just to make it shorter. But …
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