Why You Have To Scratch That Itch

Itch can be a useful warning sign, or a maddening symptom with no cure. But the origins of itch have long been a mystery.Scientists think they've come closer to understanding the origins of itch in a molecule that makes mice scratch like mad.

Source: http://www.npr.org/blogs/health/2013/05/23/186294981/why-you-gotta-scratch-that-itch?ft=1&f=1003

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