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October 3, 2007 4:23 PM

Are the spirits talking or just muscles? What about the unexplainable?

Edmond C. Gruss, author of The Ouija Board: A Doorway to the Occult (1994), is a retired professor in Santa Clarita, Calif. He was chairman of the history department at the Master's College, a Christian school, where he also taught religions of America.

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