The hair on your head doesn't all grow in the same direction — most of us have a cowlick or two. The same goes for wind on Earth. In fact, there's a bizarrely named theorem that says it's impossible for wind (or hair!) to all move in the same direction on a sphere like the Earth. It's called the hairy ball theorem.
You Spin Me Right Round
The Hairy Ball Theorem
Key Facts In This Video
If you tried to comb the hair on a hairy sphere flat, you would fail—some hair will need to stand up. 00:01
The Hair Ball Theorem proves that hair on a sphere can never be laid completely flat. 00:16
The Hair Ball Theorem implies that there is always a place on Earth where the wind is not blowing. 00:45
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