Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas

String theory was originally proposed as a relatively modest attempt to explain some features of strongly-interacting particles, but before too long developed into an ambitious attempt to unite all the forces of nature into a single theory. The great thing about physics is that your theories don’t always go where you want them to, and string theory has had some twists and turns along the way. One major challenge facing the theory is the fact that there are many different ways to connect the deep principles of the theory to the specifics of a four-dimensional world; all of these may actually exist out there in the world, in the form of a cosmological multiverse. Brian Greene is an accomplished string theorist as well as one of the world’s most successful popularizers and advocates for science. We talk about string theory, its cosmological puzzles and promises, and what the future might hold. (For more general string theory background, check out Episode 18 with Clifford Johnson.) Support Mindscape on Patreon or Paypal. Brian Greene received his doctorate from Oxford University, and is currently a professor of Physics and Mathematics at Columbia University. His research includes foundational work on topology change, mirror symmetry, and the compactification of extra dimensions. He is the author of several best-selling books, including The Elegant Universe and The Fabric of the Cosmos, both of which were made into TV specials for NOVA. He and Tracy Day are co-founders of the World Science Festival. Web site Publications from InSpire Wikipedia page Amazon author page Twitter TV Documentaries TED talk on string theory World Science Festival See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

It’s hardly news that computers are exerting ever more influence over our lives. And we’re beginning to see the first glimmers of some kind of artificial intelligence: computer programs have become much better than humans at well-defined jobs like playing chess and Go, and are increasingly called upon for messier tasks, like driving cars. Once we leave the highly constrained sphere of artificial games and enter the real world of human actions, our artificial intelligences are going to have to make choices about the best course of action in unclear circumstances: they will have to learn to be ethical. I talk to Derek Leben about what this might mean and what kind of ethics our computers should be taught. It’s a wide-ranging discussion involving computer science, philosophy, economics, and game theory. Support Mindscape on Patreon or Paypal. Derek Leben received his Ph.D. in philosopy from Johns Hopkins University in 2012. He is currently an Associate Professor of Philosophy at the University of Pittsburgh at Johnstown. He is the author of Ethics for Robots: How to Design a Moral Algorithm. PhilPapers profile University web page Ethics for Robots “A Rawlsian Algorithm for Autonomous Vehicles” See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

Sometimes science is asking esoteric questions about the fundamental nature of reality. Other times, it just wants to solve a murder. Today’s guest, Raychelle Burks, is an analytical chemist at St. Edward’s University in Texas. Before becoming a full-time academic, she worked in a crime lab using chemistry to help police track suspects, and now she does research on building new detectors for use in forensic analyses. We talk about how the real world of forensic investigation differs from the version you see portrayed on CSI, and how real chemists use their tools to help law enforcement agencies fight crime. We may even touch on how criminals could use chemical knowledge to get away with their dastardly deeds. Raychelle Burks received her Ph.D. in chemistry from the University of Nebraska, and is now an Assistant Professor at St. Edward’s University. Her current research focuses on the development of portable colorimetry sensors that can be used in the field. She is active on Twitter as @DrRubidium, and often appears as an expert on podcasts and TV documentaries, as well as speaking at conventions and festivals. She is an active advocate for women and underrepresented minorities in science. Web page Wikipedia Twitter Columns at Chemistry World Blog at Scientopia See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

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.

There won't be any regular episodes of Mindscape this week or next, as we take a holiday break. Regular service will resume on Monday January 7, 2019. In the meantime, here is a special Holiday Message. Most likely it will be of interest to very few people -- there's no real substantive content, just me talking about the State of the Podcast and some other things I've been doing. Thanks to everyone for listening, here's looking toward great things in 2019! Support Mindscape on Patreon or Paypal. 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.

Everywhere around us are things that serve functions. We live in houses, sit on chairs, drive in cars. But these things don't only serve functions, they also come in particular forms, which may be emotionally or aesthetically pleasing as well as functional. The study of how form and function come together in things is what we call "Design." Today's guest, Ge Wang, is a computer scientist and electronic musician with a new book called Artful Design: Technology in Search of the Sublime. It's incredibly creative in both substance and style, featuring a unique photo-comic layout and many thoughtful ideas about the nature of design, both practical and idealistic. Ge Wang received his Ph.D. in computer science from Princeton University, and is currently Associate Professor at the Center for Computer Research in Music and Acoustics at Stanford University. He is the author of the ChucK programming language for musical applications, and co-founder of the mobile-app developer Smule. He has given a well-known TED talk where he demonstrates Ocarina, an app for turning an iPhone into a wind instrument. Stanford Web page Artful Design home page (and Amazon page) TED talk on the DIY Orchestra of the Future Stanford Laptop Orchestra Smule 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.

The "Easy Problems" of consciousness have to do with how the brain takes in information, thinks about it, and turns it into action. The "Hard Problem," on the other hand, is the task of explaining our individual, subjective, first-person experiences of the world. What is it like to be me, rather than someone else? Everyone agrees that the Easy Problems are hard; some people think the Hard Problem is almost impossible, while others think it's pretty easy. Today's guest, David Chalmers, is arguably the leading philosopher of consciousness working today, and the one who coined the phrase "the Hard Problem," as well as proposing the philosophical zombie thought experiment. Recently he has been taking seriously the notion of panpsychism. We talk about these knotty issues (about which we deeply disagree), but also spend some time on the possibility that we live in a computer simulation. Would simulated lives be "real"? (There we agree -- yes they would.) David Chalmers got his Ph.D. from Indiana University working under Douglas Hoftstadter. He is currently University Professor of Philosophy and Neural Science at New York University and co-director of the Center for Mind, Brain, and Consciousness. He is a fellow of the Australian Academy of Humanities, the Academy of Social Sciences in Australia, and the American Academy of Arts and Sciences. Among his books are The Conscious Mind: In Search of a Fundamental Theory, The Character of Consciousness, and Constructing the World. He and David Bourget founded the PhilPapers project. Web site NYU Faculty page Wikipedia page PhilPapers page Amazon author page NYU Center for Mind, Brain, and Consciousness TED talk: How do you explain consciousness? See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

I remember vividly hosting a colloquium speaker, about fifteen years ago, who talked about the LIGO gravitational-wave observatory, which had just started taking data. Comparing where they were to where they needed to get to in terms of sensitivity, the mumblings in the audience after the talk were clear: “They’ll never make it.” Of course we now know that they did, and the 2016 announcement of the detection of gravitational waves led to a 2017 Nobel Prize for Rainer Weiss, Kip Thorne, and Barry Barish. So it’s a great pleasure to have Kip Thorne himself as a guest on the podcast. Kip tells us a bit about he LIGO story, and offers some strong opinions about the Nobel Prize. But he’s had a long and colorful career, so we also talk about whether it’s possible to travel backward in time through a wormhole, and what his future movie plans are in the wake of the success of Interstellar. Kip Thorne received his Ph.D. in physics from Princeton University, and is now the Richard Feynman Professor of Theoretical Physics (Emeritus) at Caltech. Recognized as one of the world’s leading researchers in general relativity, he has done important work on gravitational waves, black holes, wormholes, and relativistic stars. His role in helping found and guide the LIGO experiment was recognized with the Nobel Prize in 2017. He is the author or co-author of numerous books, including a famously weighty textbook, Gravitation. He was executive producer of the 2014 film Interstellar, which was based on an initial concept by him and Lynda Obst. He’s been awarded too many prizes to list here, and has also been involved in a number of famous bets. Caltech page Wikipedia page Nobel Prize citation Nobel Lecture Amazon.com author page Internet Movie Database page See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

Brains are important things; they're where thinking happens. Or are they? The theory of "embodied cognition" posits that it's better to think of thinking as something that takes place in the body as a whole, not just in the cells of the brain. In some sense this is trivially true; our brains interact with the rest of our bodies, taking in signals and giving back instructions. But it seems bold to situate important elements of cognition itself in the actual non-brain parts of the body. Lisa Aziz-Zadeh is a psychologist and neuroscientist who uses imaging technologies to study how different parts of the brain and body are involved in different cognitive tasks. We talk a lot about mirror neurons, those brain cells that light up both when we perform an action ourselves and when we see someone else performing the action. Understanding how these cells work could be key to a better view of empathy and interpersonal interactions. Lisa Aziz-Zadeh is an Associate Professor in the Brain and Creativity Institute and the Department of Occupational Science at the University of Southern California. She received her Ph.D. in psychology from UCLA, and has also done research at the University of Parma and the University of California, Berkeley. Home page USC profile Lab home page Google Scholar Talk on Brain and Body See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.