Using chemical formulas? I've tried using, now be careful: dollar-sing backslash letters "ce" opening-brace chemical-formula closing-brace dollar-sign. Unlike on chemistry, it is not working here. Did I make some mistake, is it working differently here or not supported at all?

Do you lose reputation for downvoting?

A few months ago, a question of mine was closed, the reason cited was that it was unfocused. It can be found here. I am still very interested in the answer, and today I found time to edit the question to improve its clarity. But according to this meta post, since my post is more than 70 days old,...

I have this question: Why are turbines more effective than propellers on airplanes? Unfortunately, it has been closed. The reason is off topic and specifically belonging rather to Engineering. I do not have the ability or privileges to self-migrate it, and as I understand the rules and guidelines...