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I was going to go off on a more abstract line about how the biggest thing people don't realise is that they don't realise, but then I saw the bit about career or hobby or other aspect of life. People don't realise that feet are not inherently unhygienic. In fact, feet are only smelly and unhygienic because people insist on wearing shoes - warm, moist, sweat foot-dungeons, that cause unshod feet to smell awful and that nurture bacteria and fungi.