But remember, we may not have a concrete explanation to explain ghosts and the like, should they exist, but this does not mean that whatever explains them is irrational, or a ''secret''. We just do not know, and because we cannot explain something, it does not make it unreal, although it automatically seems to be considered something to cast aside with ignorance.
This is another thing which underlines the idea of denial and delusion, which we seem to need when power is out of our reach.
But I am always willing to consider that spiritual matters may have a scientific underlining.
When people did not know that the earth was round, they thought that the edge of the world awaited those who would to come near it, and be swallowed by the abyss...science has proven this wrong today, and perhaps we will laugh at the mysticism given to ghosts and God today, in some centuries from now...