TIL: That what we think of as "pain" is actually two different things. The most basic sense is called nociception — a non-subjective reflex that drives lots of animals to pull away from dangerous things. Pain — actual pain — is what happens after nociception, and different individuals perceive it differently under different situations. So, for example, nociception is why you jerk your hand away from a hot stove. Pain is the feeling that helps you learn not to touch hot stoves again. Oh, and also, crabs might be capable of feeling both.
The two parts of pain
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