The Witness

... What we call scientific knowledge today is a body of statements of varying degrees of certainty. Some of them are most unsure; some of them are nearly sure; but none is absolutely certain. Scientists are used to this. We know that it is consistent to be able to live and not know. Some people say, “How can you _live_ without knowing?” I do not know what they mean. I always live without knowing. That is easy. How you get to know is what I want to know.

- Richard Feynman


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