Karl Popper, critical rationalist.(modern philosopher)

National Review | December 25, 1995| | Copyright

"IT'S NOT what people don't know that gets them into trouble," an American humorist once said, "it's what people know that ain't so."

Perhaps the most difficult problem in the history of philosophy has been: How do we know that what we know is so? Sir Karl Popper's startling solution to that problem (we don't) made him, at the time of his death last year at 92, the most influential recent philosopher in the world -- perhaps the most influential since Kant. His work was mainly in two cognate branches of philosophy: epistemology (the theory of knowledge) and the ...

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