How to understand extrasensory perception (ESP) and make it work for you -- Includes self-tests and exercises for readers to evaluate their own psychic potentialHans Holzer believes that everyone possesses a degree of psychic ability. The ability might be as mild as intuition or as strong as mediumship. Regardless of the degree, the "sixth sense" can be developed. The author explores clairvoyance, clairaudience, psychometry, precognition, and channeling. He reviews the history of psychic abilities from witch trials to today"s study of parapsychology.