Friday, October 20, 2006

“There are things that we know. And then there are known unknowns. That is to say there are things that we now know that we don't know. But there are also unknown unknowns. There are things we do not know we don't know … that is, the absence of evidence is not evidence of absence … simply because you do not have evidence that something exists does not mean that you have evidence that it doesn't exist.”

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