In my 76 years, I have had zero ghost and ET experiences that I am aware of, and I have a good memory for details and a willingness to believe. That of course does not mean the experieces of others are mistaken interpretations. Science typically deals only in things for which there is compelling evidence, but there does seem to be exceptions in astronomy and some areas of physics, such as quantum therory, so why not ghosts and ET? There are millions of experiencers, far more than for black holes or quantum. Neil