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This is Scientific American 60-Second Science. I'm Sophie Bushwick. Got a minute?

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Rodents called grasshopper mice have an unusual favorite food.

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Not grasshoppers. No, they really like scorpions.

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You can see the problem.

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But the mice shrug off any scorpion stings.

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And a new study shows how.

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Researchers injected common house mice with scorpion venom.

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The mice nursed the injection site for several minutes.

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But grasshopper mice injected with venom fussed for only a few seconds.

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In fact, they were more bothered by saline solution.

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So what's going on?

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In the house mouse, a specific type of nerve-cell signaling-channel got activated by the venom.

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But this same channel in grasshopper mice stayed inactive in the presence of venom, meaning the mice remained blissfully ignorant.

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In addition, a separate pathway did react to the scorpion venom,

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and it actually temporarily blocked pain signals.

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Meaning that for grasshopper mice, scorpion venom is actually an analgesic.

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The work is in the journal Science.

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Understanding details of this system could lead to new approaches in the treatment of pain in people,

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so that someday we might ask, "Scorpion, where is thy sting?"

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Thanks for the minute, for Scientific American 60-Second Science. I'm Sophie Bushwick.

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