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If consciousness is 100% physical, we would have to conclude that the same kind of consciousness that we experience as humans can be generated by non-biological entities (eventually). Conversely, if non-biological consciousness would somehow, someday, prove impossible, then consciousness would have to embed some nonphysical aspect. But how would we ever know?

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Stuart Hameroff, MD, is a physician and researcher at the University Medical Center at the University of Arizona.

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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.