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How can we be certain that we cannot be certain?

The statement that we cannot be 100% certain about anything is patently false. I am 100% certain I can not lift an ocean liner unaided, that I can not run a mile in thirty seconds, that the mass of ...
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How can we be certain that we cannot be certain?

Randy Zeitman in his answer says: It's completely absurd to say we cannot be 100% certain. He and others here have danced around a fact that needs to be made explicit. Certainty is a psychological ...
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