How do we figure out how the world works?  We have an idea, we test it and we find that the results either support our idea or they don’t.  If we do multiple tests and don’t see the results that our idea predicts, we either reject the idea as false, or we modify it and retest.  If we persist and refuse to accept any idea that we or others have shown is false, we close in on an explanation that is likely to be correct.

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