Really smart people can explain things well. Richard Feynman also comes to mind.
If someone can’t explain things, then they probably are not as smart as they may think they are.
Love Richard Feynman...
If you ever get a chance, his book “Surely You’re Joking Mr. Feynman” is educational and hilarious to read!
I know he and I would likely have not seen eye to eye on many issues, but I respect the hell out of him, because he did make an effort to think his positions all the way through.
I was lazy in high school but the only class I really enjoyed was physics, taught by Mr. Larson.....He made it interesting