When you have an itch on one arm, scratching the other arm can actually relieve the itch!

When you have an itch, you should scratch it. But what if you have a disease like eczema, where scratching can make everything worse? Enter these scientists, who set out to determine whether your brain can be tricked into thinking an itch has been scratched when it hasn’t. First, they “experimentally induced” itching by injecting histamine (eek!) into a subject’s right arm. Then, they scratched the subject’s left arm while holding up a mirror, which made it appear that the right arm was being sc

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