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The branch of philosophy that asks whether knowledge is even possible, and if so, how. It's the field that gave us Descartes' "I think, therefore I am" (the only thing he couldn't doubt) and every philosophy student's favorite question: "But how do you know?" Epistemological philosophy has spent millennia refining the art of skepticism, producing generations of graduates who can undermine any claim but can't actually prove anything themselves. It's the philosophy of "are you sure about that?" elevated to a discipline.
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