I take it on trains twice daily... into stores frequently... into my office every day... on subways occasionally (if I wuss out of riding in the rain). Haven't had to bus yet, haven't tried a library. Tried and failed to take it onto the campus of Brooklyn College; they have a little bike parking lot there, made me lock the bike and sign it in!

The thing about professors... on your first day of class, when you walked in and sat down and looked at the professor and s/he noticed you and saw what you're wearing and where you're sitting, and noticed your demeanor and the expression on your face, that's when s/he decided what grade you're getting. At this point, by the way, I hope you made dang sure that "A" is written all over your face. OK, now you have to follow through with exams and term papers, but they probably don't count as much as they should. SO, the question is: how's a folding bike going to effect the equation? I think you'll have to make that judgment instinctively, based on what you know about the professor in question. Some will like it... some will not. Your call!