I am a 30 year old and something teacher, who currently has finished her 3rd degree in natures science, would it be too much to ask for you students to use rubbers in my classroom? I know its outdated, and you're trying to be hip, but does it make too much noise if you go in with it? You don't have to use pens all of the time. Try a little discretion because other alums are trying to study what I am teaching. And do it now! Learning can't wait.