That's really good Professor thanks!

I'll throw this video in too.

Oh, remember you can use https://invidious.fdn.fr in leu of Youtube.

i.e.

https://invidious.fdn.fr/watch?v=m58IBC9SCGE

Instead of

https://www.youtube.com/watch?v=m58IBC9SCGE

(see you just replace the domain name)

You'll get tracked less and reduce ad/clicks for youtube.

Sorry, but this guy is a moron. Like me, a horrible teacher.