There are no such things as ghosts... there is only energy that particular objects that belonged to someone have. That explains a lot of paranormal stuff, from haunting to premonitory dreams and stuff like that - I love that thing, premonitions knock down the whole theory of Decartes and causality and all that, because contrary to all believes, premonitions put cause in front of the effect which has been considered impossible before. So in my opinion there can be no ghosts - remember that technically speaking all the info a person has is in the brain and so when the person's dead, the electrical impulses among the neuros are also dead and so if there was such a thing, a ghost could have no self-consciousness or knowledge or memories... and for that reason, what some people call ghosts (poltergeist for example) are in fact forms of primary energy - which might pe positive or negative - never neutral. Science will be able to explain everything in the end. Shirley