Dimly Lit Corner is my soapbox. I stand on this whenever I get the urge to fulminate in public about something that genuinely irritates me. All my career I have worked as a teacher. For much of it I taught Chemistry and Physics. In the last year or so I have switched to teaching Mathematics and Statistics. I welcome comments. Anything you like. If they are bad, I'll remove them. I have no problem with censorship, especially my own.