system in the following way. First of all, uncertainty is tremendously stressful for a human nervous system. And I don't mean stress in a euphemistic way. I mean it adds a metabolic burden to a nervous system which if it persists can actually make someone sick and I think religious beliefs can reduce uncertainty. They sometimes explain the unexplainable. Things that we now might explain through science, used to be thought of as magic or as caused by a deity. So, I think in some ways it is not just psychologically comforting, it's actually physiologically