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The stunning realization that there may be multiple universes has progressed from speculative metaphysics (or science fiction) to serious theoretical cosmology to datarich observational cosmology to majorityaccepted conventional wisdom. Yet challenges remain and questions abound.

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Carlo Rovelli is an Italian theoretical physicist at Centre de Physique Theorique de Luminy.

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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.