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A Ticklish Question
Alan learns we don't need people in order to be tormented by tickling.


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Laughing Matters
Think you only laugh when something’s funny? Think again.


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Cold Comfort
Some cold remedies may be all in your head.


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Why Are Peppers Hot?
A chemical called capsaicin makes chili peppers burn our mouth. But scientists discover it can also help ease pain by dulling nerve endings.


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