Thomas R. answered 05/14/18
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I agree with Mark. The technique is known as "cold reading", and magicians who claim no psychic powers can also do this. James "The Amazing" Randi has demonstrated this skill publicly countless times over his decades of performing. You might also check out the print or online version of the magazine The Skeptical Inquirer. Even the TV show South Park had an episode explaining how cold reading works. You can probably find a clip on YouTube.