What do we know and how do we know it? What is knowledge? What is belief? How is belief justified? What justifies us in believing what we believe? Is justified belief knowledge? These questions constitute “epistemology” – the theory of knowledge.

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Bas C. van Fraassen is a Distinguished Professor of Philosophy at San Francisco State University and the McCosh Professor of Philosophy Emeritus at Princeton University.

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Closer to Truth, hosted by Robert Lawrence Kuhn and directed by Peter Getzels, presents the world’s greatest thinkers exploring humanity’s deepest questions. Discover fundamental issues of existence. Engage new and diverse ways of thinking. Appreciate intense debates. Share your own opinions. Seek your own answers.