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This text explains why beliefs in supernatural forces - ghosts, poltergeists, witches, and spirits - are based on universal experience. The author maintains that beliefs in mysterious anomalies such as estatic trances, apparitions, extra-sensory perceptions, out-of-body experiences, psychokinesis, firewalking, and miraculous recovery are predicated upon evolutionary psychology. Such beliefs reveal a spiritual impulse in the human species. He aims to demonstrate that age-old healing rituals such as chanting and rythmic dancing have scientically verifiable benefits.
A Sat, study studied this question.