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Sir Roger Penrose has had a remarkable life. He has contributed an enormous amount to our understanding of general relativity, perhaps more than anyone since Einstein himself -- Penrose diagrams, singularity theorems, the Penrose process, cosmic censorship, and the list goes on. He has made important contributions to mathematics, including such fun ideas as the Penrose triangle and aperiodic tilings. He has also made bold conjectures in the notoriously contentious areas of quantum mechanics and the study of consciousness. In his spare time he's managed to become an extremely successful author, writing such books as The Emperor's New Mind and The Road to Reality. With far too much that we could have talked about, we decided to concentrate in this discussion on spacetime, black holes, and cosmology, but we made sure to reserve some time to dig into quantum mechanics and the brain by the end. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

It's a big universe out there, full of an astonishing variety of questions and puzzles. Today's guest, Janna Levin, is a physicist who has delved into some of the trippiest aspects of cosmology and gravitation: the topology of the universe, extra dimensions of space, and the appearance of chaos in orbits around black holes. At the same time, she has been a pioneer in talking about science in interesting and innovative ways: a personal memoir, a novelized narrative of famous scientific lives, and a journalistic exploration of one of the most important experiments of our time. We talk about how one shapes an unusual scientific career, and how the practice of science relates to more traditionally humanistic concerns. Support Mindscape on Patreon or Paypal. Janna Levin received a Ph.D. in physics from MIT, and is now the Tow Professor of physics and astronomy at Barnard College of Columbia University. She is the author of  How the Universe Got Its Spots, A Madman Dreams of Turing Machines, and Black Hole Blues. Her awards include the PEN/Bingham Prize and a Guggenheim Fellowship. She is also the director of sciences at Pioneer Works in Brooklyn, NY. Web site Columbia web page Publications on INSPIRE TED talk on gravitational waves Amazon author page Pioneer Works Wikipedia page Twitter See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

Sam Harris talks to economist Glenn C. Loury about racism, police violence, the Black Lives Matter movement, and related topics.

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Racial bias is everywhere but we may not always see it. However, understanding the way people feel about and behave toward those outside their own group can help communities heal after a tragedy, as well as prevent future ones, according to Yale University psychologist John Dovidio, PhD.

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