Body & Immune System
Why Do Mosquito Bites Itch?
The itch is not from the bite itself. It comes from your own immune system reacting to mosquito saliva. Here is what is actually happening under your skin.
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Biology & Neuroscience
Why Do We Scratch an Itch?
Scratching interrupts itch signals with pain signals and briefly feels satisfying. But it also triggers serotonin release that makes itching worse. Here is the full cycle.
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Biology & Skin
Why Do We Get Dark Circles Under Our Eyes?
Dark circles have three different causes, and treating the wrong one does nothing. Here is how to tell which type you have and what actually causes each one.
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