>> School windows never open
The ones at my school did. In fact, they remained open, sun or rain. I remember our Latin teacher had a habit of casually tossing our marked exercise books, frisbee-style, to us from his desk at the front. If you were lucky enough to sit by a window, there was a chance that your exercise book might fly outside before you had a chance to catch it. That meant you were allowed to go outside (two floors down, in the playground) to fetch it. If you were unlucky, it would be raining and your book would be a pulpy lump by the time you retrieved it.