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No such things exist. There's always a natural explanation for these things and few people realize for example how much our brains and senses can trick us and "malfunction" so as to produce abnormal effects. It's just a poor understanding of how we perceive reality in the first place.
This is coupled with a somewhat natural tendency for supernatural beliefs that seems to be built in with some people more than others, these things together can be a very convincing combination.
If ghosts were a real thing, they would be an everyday occurrence and everyone would see them equally and constantly. We are members of the same mammal species with the same functions and senses, there are no special individuals with extraordinary abilities to detect otherworldly things.
I'm willing to concede that there probably is stuff going on that we are unable to detect at this time, but I don't think it has anything to do with dead people. Simply some natural processes that we can't see, just like we couldn't see bacteria until the invention of the microscope.
Samuel L. Jackson's character had a good line about this in some horror movie whose name I forget. People fear death, so they like to believe in ghosts because it means that there's at least *something* beyond death and it feels reassuring in a weird way.