Thinking a lot about ratchets lately. Internal and external. Ratchets are more fundamental than clocks. Things that can only grow in one direction, and reversed only via destruction.
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Just thought of a good one: ear wax. There's some sort of mechanism in inner ear that produces and moves ear wax outwards. Also more trivially, digestive tract. Throwing up is a sign of illness (ratchet reverse), pooping is normal.
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Body weight maintenance?
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