sentences:  The second edition, published in 2000, adds information from the intervening 20 years as well as substantially more documentation and references to the original material.Marks and Kammann give detailed descriptions of experiments conducted by parapsychology researchers as well as performances by psychic entertainers outside of the laboratory during the 1970s.Many of these included some of the most widely known psychic performers of the time, including Uri Geller, Kreskin, and Ingo Swann.