The Hairy Ball Theorem

(Invidious link: https://yewtu.be/watch?v=BHdbsHFs2P0 )

Unexpected applications and a beautiful proof. [...] Home page: https://www.3blue1brown.com/

Credits:Senia Sheydvasser: Co-writing and sphere deformation animations, made in BlenderPaul Dancstep: Those lovely fluffy sphere animations, made in Cinema4DVince Rubinetti: Music

Timestamps:0:00 - To comb a hairy ball1:24 - Applications8:46 - The puzzle of one null point12:12 - The proof outline16:41 - Defining orientation21:44 - Why inside-out is impossible25:59 - 3b1b Talent27:44 - Final food for thought