That's a cool video, I'm subscribing. It's surprising that the embedded sphere has an unbounded radius. He didn't mention in the video that this problem is due to, and is a sort of dual or inverse to the fact that the volume of an N-dimensional sphere goes to zero as N goes to infinity. That hurt my head a little the first time I learned about it!
It's him that made me understand linear algebra. College? No fucking clue what a matrix was. Now? a clear, intuitive understanding. I'm still struggling with concepts like trace, but he provided a base from which to I'm able to climb myself.
Only 383k subscribers. Hmm. Remember to subscribe, comment, and smash that like button.
Real Engineering is another great channel. And of course Veritasium and Numberphile.