Years ago when my wife and I we were planning to buy our home, my dad stunned me with a quick mental calculation of loan payments. I asked him how - he said he'd learned the strange formula for compound interest from his father, who was a merchant in 19th century Iran.
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My meager education in biology and evolution gave me the mistaken impression that evolution optimized everything. But it didn't.
One example is the recurrent laryngeal nerve (RLN). It goes from behind your ear, loops down below your aorta, and then back up to the voice-box
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