Philosophical skepticism, in part coming from Decartes, considers the idea that it's impossible to know another person's reality. Alva Noë ponders this in relation to debates in today's world.

CAMBRIDGE, England, Jan. 29 -- The history of skepticism is sometimes said to be the history of philosophy itself. For skepticism, or intellectual doubt, began with the ancient Greeks and still ...

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Philosophical skepticism arises from the theory of knowledge, the branch of philosophy called “epistemology.” Epistemology studies the grounds for our beliefs and the sources of our concepts.