One of those other topics has to do with teaching. I had some excellent teaching at MIT and some terrible teaching there. The variability in teaching was even more dramatic when I was in grad school (at Berkeley). But, again, that would take a lengthy essay to discuss.

Having taught some (in-house) classes at work, I recognize that teaching is difficult. Much of the challenge is understanding what is and isn't hard for students and many of the failures of teaching were associated with assuming students knew things they didn't.