Boing Boing on MSN11h
The "Hairy Ball" theorem explainedThe Hairy Ball theorem, proved by Henri Poincaré in 1885, demonstrates that it's impossible to create a perfectly smooth hair ...
Our editors handpick the products that we feature. We may earn commission from the links on this page. Hair texture changes during menopause and perimenopause are real—and often exasperating.
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback