ELI5 Hair - pluck out a hair, then rub the pain away, why does this work?
When I pluck a hair out of my forehead, the area hurts a lot, but I can reduce the pain to nearly zero simply by briefly rubbing the area. Why is this? What is the gate control theory? Why do some hairs grow only grow to a certain length (like our eyebrows), while others grow forever?
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