The first thing David Ferst did was ask me for a quarter. To prove that he was working with just an ordinary quarter, he had me initial the coin with a Sharpie pen and memorize the date. (It was an Oklahoma 2008 state quarter.) I closed my hand around the coin, as instructed.
“I want you to concentrate on the coin,” he said, looking me in the eye. “When I count to three, the coin is going to get a little warmer. One, two, three. Do you feel it getting warmer?”