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DOEP (Daily Open-Ended Puzzle) (intermittent): Why scratch?

Since there are no (?) instances when we are encouraged to scratch ourselves for health reasons (exception: to dislodge bugs from our various pelted patches?), why did natural selection favor near-hairless mammals who scratch themselves inappropriately?

Bonus question: Since it’s well known that we cannot tickle ourselves, why does scratching ourselves feel so darn good? Ahhhh….. [Tags: ]

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