How does a camera know when a ghost is around, I take pictures all the time and I never see any white stuff that let;s you know that the white stuff is a ghost, what type of camras cature real ghosts in the picture.

People seem to believe that ghosts draw energy from appliances and batteries and yet ghost stories have been around since before those things were invented, how did ghosts cope without electricity in the past?
Also, where did the idea of ghosts using electricity originate?

i kinda believed in ghosts until the other night when i was thinking to myself.. what are ghosts made up of? i know people are made up of cells, organelles, organs, tissue, and all that good stuff you learn about in science class.. but can someone please tell me (that is, if ghosts are real..) [...]