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Theory of ghosts
At the time of death the soul is expelled from the uninhabitable body as a gas and has weight of approximately 21 grams.
The soul is not only made up of gas, but also light and energy and they continue to live on retaining all memories and personality. This much I can conclude from what I have learned about in EVP communication experiments that allow me to have direct communication with spirits (Ghosts).
When the soul is released it expands and is free of the body that had encapsulated it in the small confines of the human body.
Now free they may be joined by others they have known in life. This is the beginning of their second life as a ghost.