I think it's fair to say "invisible" things are generally all pretty high on the list of frightening things people don't know about. Including but not limited

I think it's fair to say "invisible" things are generally all pretty high on the list of frightening things people don't know about. Including but not limited to: software, nuclear radiation, CO and chemistry in general, electricity, microbiology, politics in practice, macro-economics and banking, ... (it's a pretty long list)