Cowlicks. Why do they stay even after they get wet and dry?
In: Biology
This is known as the [Hairy Ball Theorem](https://en.m.wikipedia.org/wiki/Hairy_ball_theorem). Basically, you can’t comb a hairy ball (your head) flat without creating a cowlick.
A hairy donut (a torus) is quite easy to comb without a cowlick.
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