Modern spiritualists and psychics keep detailed files on their victims. As might be expected, these files can be very valuable and are often passed on from one medium or psychic to another when one retires or dies. Even if a psychic doesn't use a private detective or have immediate access to driver's license records and such, there is still a very powerful technique that will allow the psychic to convince people that the psychic knows all about them, their problems, and their deep personal secrets, fears, and desires. The technique is called cold reading and is probably as old as charlatanism itself... If John Edward (or any of the other self-proclaimed speakers with the dead) really could communicate with the dead, it would be a trivial matter to prove it. All that would be necessary would be for him to contact any of the thousands of missing persons who are presumed dead—famous (e.g., Jimmy Hoffa, Judge Crater) or otherwise—and correctly report where the body is. Of course, this is never done. All we get, instead, are platitudes to the effect that Aunt Millie, who liked green plates, is happy on the other side.[192]
Have a paper and pen handy. Whenever I get a psychic or tarot reading, I tell myself that I’m going to remember everything and then… I don’t. So grab a piece of paper and a pen (preferably a glittery one – because life is more fun with glitter) and write down important stuff so you don’t forget anything. If something doesn’t make sense right now, it might later. 

Besides reaffirming my belief that I'm a great liar and should do it more, my test also gave me some insight on how psychics work. They're talented when it comes to finding ways squeeze emotions out of you and make general statements that allow you to fill in the blanks yourself—you're contributing to your own deception (example: They say they sense a female presence watching over you, at which point you say, "Oh shit, my aunt/grandma/mom/friend/cousin/sister/teacher died a little while ago—it MUST be her!"). I think so many people turn to psychics because they help ease the fear of the great unknown that is death and give meaning and purpose to seemingly unfair and random events in our chaotic universe. To me, that's a form of preying on the weak and exploiting people at their most emotionally vulnerable, but if you believe in the afterlife and psychic powers, I can understand how the experience would be comforting - after all, who doesn't want to know that a loved family member, living or dead, is doing okay?
Some scientists of the period who investigated spiritualism also became converts. They included chemist Robert Hare, physicist William Crookes (1832–1919) and evolutionary biologist Alfred Russel Wallace (1823–1913).[13][14] Nobel laureate Pierre Curie took a very serious scientific interest in the work of medium Eusapia Palladino.[15] Other prominent adherents included journalist and pacifist William T. Stead (1849–1912)[16] and physician and author Arthur Conan Doyle (1859–1930).[17]