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In: Biology
Your skin absorbs water. When it absorbs water, it expands. However, it can’t expand infinitely because that would pull it away from your body (which it can’t do because of how it’s attached to you.) So it has to expand in a different way. The wrinkles occur because that increases the surface area of your skin without needing to pull the skin away from the stuff it’s attached to.
Wrinkled surfaces have more surface area than smooth surfaces with the same volume. This is why healthy human brains are wrinkly: those wrinkles mean more surface area, and the surface part of your brain is where the layers of special cells (collectively called the “neocortex”) are located. More wrinkles, more fancy cells, more powerful brain.
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