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Lots of things exist. But what is so absolutely fundamental in that it cannot be further reduced into anything more fundamental, but other things that exist can be reduced to it? The challenge is to discern the minimum number of basic categories that can explain the entirety of existence.

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David Chalmers is a philosopher at New York University and the Australian National University. He is Professor of Philosophy and codirector of the Center for Mind, Brain, and Consciousness at NYU, and also Professor of Philosophy at ANU.

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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.