Today I Learned (TIL)

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TIL the Hairy Ball theorem (wikipedia.org)

submitted 4 days ago* (last edited 3 days ago) by vatlark@lemmy.world to c/til@lemmy.ca

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The theorem has been expressed colloquially as "you can't comb a hairy ball flat without creating a cowlick" or "you can't comb the hair on a coconut".

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[–] grrgyle@slrpnk.net 47 points 3 days ago (2 children)

A hairy doughnut … on the other hand, is quite easily combable.

What gives someone the right to speak like this. You think this is the kind of factoid I can just forget?? No, this meme is going to jockey my brain until the day I die.

[–] critical@reddthat.com 6 points 3 days ago (1 children)

Like a chicken?

[–] Kolanaki@pawb.social 6 points 3 days ago (1 children)

"CHICKEN JOCKEY!"

throws popcorn at phone screen

[–] grrgyle@slrpnk.net 3 points 3 days ago (1 children)

My nephews have been screaming this. I thought they were just insane, but apparently I've missed a meme!

[–] can@sh.itjust.works 2 points 3 days ago

Minecraft

[–] TonyTonyChopper@mander.xyz 4 points 3 days ago

I want to know more. Does this only work for donuts with 1 hole? Odd numbers of holes?