"psychic powers and extra-sensory perception (esp) rank among the top ten unexplained phenomena if for no other reason than that belief in them is so widespread. many people believe that intuition (see #3) is a form of psychic power, a way of accessing arcane or special knowledge about the world or the future. researchers have tested people who claim to have psychic powers, though the results under controlled scientific conditions have so far been negative or ambiguous. some have argued that psychic powers cannot be tested, or for some reason diminish in the presence of skeptics or scientists. if this is true, science will never be able to prove or disprove the existence of psychic powers."
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