We generally have excellent teachers, but my regular teacher was out on sick leave for 3 weeks and we had this old fart teacher who thought we needed a lesson in basic computer knowledge. Page one in his PowerPoint presentation shows the inside of a computer and he points out the propellers (fans).
He also probably spent a lot of time making a dictionary for us to know what thingies on a computer are called in 3 languages.
Sorry old fart teacher, just venting. I'm sure he's a better person than teacher.