Photo: Naked Mole Rats Unable to Feel Burning Pain

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This naked mole rat, in the lab of researcher Thomas Park, is oblivious to the burning sensation of acid, new research shows.

The hairless animals may have evolved this ability due to their tight-knit, carbon-dioxide-rich living quarters, scientists suggest.

That's because the gas can break down and turn to acid, which would otherwise create an irritating atmosphere for the underground-dwelling mammals.

Photograph courtesy Kathryn Marchetti/UIC Photo Services

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