Throughout history, there have been many claims of extrasensory perception (ESP). However, the first real experiments and popularization of ESP occurred in the 1930s with J. B. Rhine’s research at Duke University. He was first to employ the card-guessing technique, which utilized Zener cards. Each card is printed with the image of a different shape, such as a circle, a square, a few waves, a cross, or a star. With the symbol side hidden, the person being tested for extrasensory perception is asked to guess which symbol is on the card, while the proctor records the results. In The Phantom
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