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Originally posted by: tk149 Here is the simplest explanation I've found. NOVA: What do you mean when you say that you cannot prove a negative?
KLASS: Let me give an example. No one has ever proved, to my knowledge, that Santa Claus does not exist. And if one were to fly to the North Pole and say: Well, look, there's no toy factory there. A believer could argue: Well, Santa Clause knew you were coming and moved his operations to the South Pole. So you fly down to the South Pole. No Santa Claus factory, toy factory there. So the believer would say: Oh, he moved it back up to the North Pole. So you simply cannot prove -- one cannot prove that ghosts do not exist; one cannot prove that leprechauns too do not exist. One simply cannot prove a negative.
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