10. For students and postdocs: If you are paid a salary, you should do the work.
. . . .
12. For students visiting professors, even outside of office hours: If the professor is dining al desco, an activity typically done to save time on a busy day, don't ask, "Are you busy?" The answer is yes. Ask instead, "Do you have a few minutes to talk, or should I come back at a better time?"
As someone who almost always eats "al desco" (what a great phrase), I loved that last bit. Brava, Female Science Professor!