In most places, your skin isn't much thicker than cardboard. But although it is so thin, lots of things happen inside it. Hair grows in skin, and sweat is made there. Skin also has blood vessels, and nerves to send messages to your brain.
[This is what skin looks like through a microscope.]
[Whether your skin is light or dark, too much sun can burn you. Wear a hat and put on a layer of sun protection cream.]
[Sweat is salty water that your body makes when it's hot.]
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