Too bad the narrator has a dick in his mouth the whole time.

Magnetic gears have hardly any torque and can only be used where slippage is acceptable in the system.

Using them to drive a propeller underwater without worrying about water leaking along a drive shaft is a good example: https://m.youtube.com/watch?v=KLEH8RJsYgI

Merely adding a flux capacitor would boost the torque into the future. - Dr Emmett Brown

Can't understand the dude at all.