Great point (and good story about the prof's reaction too). It's quite possibly a combo: some people have innate ability and just "get it" no matter how bad th

Great point (and good story about the prof's reaction too). It's quite possibly a combo: some people have innate ability and just "get it" no matter how bad their teaching is; others get it by a combo of teaching and work. And yes, time to read the book for this and other reasons!