Prof. Fred Alan Wolf says: "There is evidence that suggests the existence of a non-material, non-physical universe that has a reality even though it might not as yet be clearly perceptible to our senses and scientific instrumentation. When we consider out-of-body experiences, shamanic journeys, and lucid dream states, though they cannot be replicated in the true scientific sense, they also point to the existence of non-material dimensions of reality."

If you scroll past all the adverts, this is a great article on Fred. who lost a son at age 25 and said: "I've had a number of deaths, and a number of -- let's call it "visits" of certain kinds." He also said: "there are a number of really good scientists out there who have had these kinds of experiences but will not talk about them -- they like to keep their science in one pocket and their spiritual beliefs in a whole other pocket."