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You can't knowc (know with absolute certainty) very much at all; there's always a demon/evil genius/etc to contend with. However, if we use a looser definition for know (as we do in real life) then I think it's safe to say we know we're not dreaming; and leave the skeptics to (truthfully) say that with their definition, it's not possible to knowc. But we just ask them what exactly it is that they do knowc that makes it a useful distinction...
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I can't understand why people are frightened of new ideas. I'm frightened of the old ones. -- John Cage (1912 - 1992)
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