--such as, why are some of the power outlets in hospitals red? I just got an order to engrave 300 outlet covers for a hospital, and half of them are red. I've been AWARE of red outlets all my life, but never thought to ask anyone WHY they're red! So when the electric company dropped them all off yesterday, I asked. Now I know, and I'm not sure if I feel dumb, or smart about that!

Just curious who does, and doesn't know why the red ones are red! (Maybe I'm the only one!) - If you know, just say so for now, and we can reveal in a few days

Also curious about other reasonably common things that may be unknown to myself and others... post up!

Likely won't be the next 'levity' thread but it could get interesting!