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The "Hairy Ball" theorem explained
The Hairy Ball theorem, proved by Henri Poincaré in 1885, demonstrates that it's impossible to create a perfectly smooth hair ...
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What it means if you see strange 'swirls and wave' patterns when you close your eyes
If you see peculiar 'swirls and wave' patterns when you close your eyes before going to sleep, science has got to the bottom of the phenomenon. Drifting off to sleep can be a battle at the best of ...