scientific evidence to date does not exist. And how can they be, if people can't even agree upon who are the ghosts. Someone claims that it is the spirits of the dead who never made it to the other world and returned to this, and some say ghosts are projections of the human mind in the real world. There are those people who create a separate category of ghosts, for example, poltergeists, ghosts, houses, intelligent spirits, shadow people and much more. It looks like the discussion of different races of fairies or dragons – is extremely unrealistic. There are also many other contradictions concerning ghosts. For example, the material spirits, or not? They can interact with people and objects from the real world? Or they can move through objects? If ghosts are human souls, why do they appear in clothing? And in this case a Ghost ship or a Ghost train?