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

The founders of statistical mechanics in the 19th century faced an uphill battle to convince their fellow physicists that the laws of thermodynamics could be derived from the random motions of microscopic atoms. This insight turns out to be even more important than they realized: the emergence of patterns characterizing our macroscopic world relies crucially on the increase of entropy over time. Barry Loewer has (in collaboration with David Albert) been developing a theory of the Mentaculus — the probability map of the world — that connects microscopic physics to time, causation, and other familiar features of our experience.

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Barry Loewer received his Ph.D. in philosophy from Stanford University. He is currently distinguished professor of philosophy at Rutgers University. His research focuses on the foundations of physics and the metaphysics of laws and chance.

• Web page
• PhilPeople profile
• Google Scholar publications
• Wikipedia
• Amazon author page

It's a big universe we live in, so it comes as no surprise that big numbers are needed to describe it. There are roughly 10^22 stars in the observable universe, and about 10^88 particles altogether. But these numbers are nothing compared to some of the truly ginormous quantities that mathematicians have found to talk about, with inscrutable names like Graham's Number and TREE(3). Could such immense numbers have any meaningful relationship with the physical world? In his recent book Fantastic Numbers and Where to Find Them, theoretical physicist Antonio Padilla explores both our actual universe and the abstract world of immense numbers, and finds surprising connections between them.

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Antonio (Tony) Padilla received his Ph.D. in physics from the University of Durham. He is currently a Royal Society Research Fellow in the School of Physics and Astronomy at the University of Nottingham. He is a frequent contributor to the YouTube series Sixty Symbols and Numberphile.

• Web page
• Nottingham staff page
• Google Scholar publications
• Amazon author page
• Twitter

Welcome to the October 2022 Ask Me Anything episode of Mindscape! These monthly excursions are funded by Patreon supporters (who are also the ones asking the questions). We take questions asked by Patreons, whittle them down to a more manageable number — based primarily on whether I have anything interesting to say about them, not whether the questions themselves are good — and sometimes group them together if they are about a similar topic. Enjoy!

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With communication satellites, weather satellites, GPS, and much more, what happens in space is already important to our lives here on Earth. And the importance of space is only going to grow as we increase the presence of humans, whether in Earth orbit or beyond. So the questions of what laws govern activity in space, and how nations and institutions should practice good governance more generally, are becoming increasingly urgent. Timiebi Aganaba is an academic and space lawyer who has experience experience in a wide variety of context and countries. We talk about the current status of space law and how to guarantee good governance going forward.

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Timiebi Aganaba received Ph.D. and LL.M. degrees from the Institute of Air and Space Law at McGill University. She is currently an assistant professor in the School for the Future of Innovation in Society at Arizona State University, with a courtesy appointment at the Sandra Day O'Connor College of Law. She is also an affiliate faculty with the Interplanetary Initiative and a senior global futures scientist with the Global Futures Lab at ASU. She served as Executive Director of the World Space Week Association, and currently serves on advisory boards for the UN Space Generation Advisory Council, the Board of World View Enterprises, and the SETI Institute. She was the recipient of a Space Leaders Award from the International Astronautical Federation and her doctorate received the George and Ann Robinson Award for advanced research capabilities.

• Web site
• ASU web page
• SpaceTV profile
• World Space Week

The detection of gravitational waves from inspiraling black holes by the LIGO and Virgo collaborations was rightly celebrated as a landmark achievement in physics and astronomy. But ultra-precise ground-based observatories aren't the only way to detect gravitational waves; we can also search for their imprints on the timing of signals from pulsars scattered throughout our galaxy. Chiara Mingarelli is a member of the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) collaboration, which uses pulsar timing to study the universe using gravitational waves.

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Chiara Mingarelli received her Ph.D. in physics from the University of Birmingham. She is currently an assistant professor of physics at the University of Connecticut and a research scientist at the Flatiron Institute Center for Computational Astrophysics. Her Ph.D. thesis was selected by Springer Nature as an Outstanding PhD thesis, and she was selected as a "Voice of the Future" by the Royal Astronomical Society. She regularly contributes to science communication, including Amy Poehler's Smart Girls and the Science Channel's "How the Universe Works."

• Web site
• Simons Foundation web page
• Google Scholar publications
• Wikipedia
• Twitter

My little pandemic-lockdown contribution to the world was a series of videos called The Biggest Ideas in the Universe. The idea was to explain physics in a pedagogical way, concentrating on established ideas rather than speculations, with the twist that I tried to include and explain any equations that seemed useful, even though no prior mathematical knowledge was presumed. I'm in the process of writing a series of three books inspired by those videos, and the first one is coming out now: The Biggest Ideas In The Universe: Space, Time, and Motion. For this solo episode I go through one of the highlights from the book: explaining the mathematical and physical basis of Einstein's equation of general relativity, relating mass and energy to the curvature of spacetime. Hope it works!

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What's the fastest way to get a human being around a racetrack, if we ignore all the rules of racing? How many pages would you have to read to absorb all of the government laws that apply to you? It's hard to imagine a better person to tackle these kinds of slightly-askew questions than Randall Munroe, creator of the xkcd webcomic. He collected some answers in his book What If?, and has released a sequel, What If? 2. We dive into how one goes about choosing the right questions and answering them, and how to make it funny along the way.

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Randall Munroe received a degree in physics from Christopher Newport University, before working for a while at NASA's Langley Research Center. He is now the creator of xkcd and the author of several books. What If? and What If? 2 are based on a regular feature in which he tackles questions asked by readers.

• Web site
• Amazon author page
• Explain xkcd
• Wikipedia
• Twitter

People throughout history have imagined ideal societies of various sorts. As the twentieth century dawned, advances in manufacturing and communication arguably brought the idea of utopia within our practical reach, at least as far as economic necessities are concerned. But we failed to achieve it, to say the least. Brad DeLong's new book, Slouching Towards Utopia: An Economic History of the Twentieth Century, investigates why. He compares the competing political and economic systems that dominated the "long 20th century" from 1870 to 2010, and how we managed to create such enormous wealth and still be left with such intractable problems.

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J. Bradford DeLong received his Ph.D. in economics from Harvard University. He is currently a professor of economics at the University of California, Berkeley. and chief economist at the Blum Center for Developing Economies. He previously served as deputy assistant secretary of the U.S. Treasury for Economic Policy from 1993 to 1995. He has been a long-running blogger, now moved to Substack. He is a co-editor of The Economists' Voice.

• Web site
• Berkeley web page
• Substack/blog
• Google Scholar publications
• Podcast (with Noah Smith)
• Wikipedia
• Twitter

Welcome to the September 2022 Ask Me Anything episode of Mindscape! These monthly excursions are funded by Patreon supporters (who are also the ones asking the questions). We take questions asked by Patrons, whittle them down to a more manageable number — based primarily on whether I have anything interesting to say about them, not whether the questions themselves are good — and sometimes group them together if they are about a similar topic. Enjoy!

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There is no human endeavor that does not have a theory of it — a set of ideas about what makes it work and how to do it well. Music is no exception, popular music included — there are reasons why certain keys, chord changes, and rhythmic structures have proven successful over the years. Nobody has done more to help people understand the theoretical underpinnings of popular music than today's guest, Rick Beato. His YouTube videos dig into how songs work and what makes them great. We talk about music theory and how it contributes to our appreciation of all kinds of music.

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Rick Beato obtained a master's degree in jazz studies from the New England Conservatory of Music. He is currently a producer and owner of Black Dog Sound Studios in Georgia, as well as host of a popular YouTube channel. He has worked as a session musician, songwriter, and lecturer at Berklee College of Music and elsewhere. He is the author of The Beato Book Interactive as well as other music-training tools.

• Web site
• YouTube channel
• Discogs page
• AllMusic page
• Wikipedia
• Twitter

It's always a little humbling to think about what affects your words and actions might have on other people, not only right now but potentially well into the future. Now take that humble feeling and promote it to all of humanity, and arbitrarily far in time. How do our actions as a society affect all the potential generations to come? William MacAskill is best known as a founder of the Effective Altruism movement, and is now the author of What We Owe the Future. In this new book he makes the case for longtermism: the idea that we should put substantial effort into positively influencing the long-term future. We talk about the pros and cons of that view, including the underlying philosophical presuppositions.

Mindscape listeners can get 50% off What We Owe the Future, thanks to a partnership between the Forethought Foundation and Bookshop.org. Just click here and use code MINDSCAPE50 at checkout.

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William (Will) MacAskill received his D.Phil. in philosophy from the University of Oxford. He is currently an associate professor of philosophy at Oxford, as well as a research fellow at the Global Priorities Institute, director of the Forefront Foundation for Global Priorities Research, President of the Centre for Effective Altruism, and co-founder of 80,000 hours and Giving What We Can.

• Web site
• PhilPeople profile
• Google Scholar publications
• Wikipedia
• Twitter

Evolution by natural selection is one of the rare scientific theories that resonates within the wider culture as much as it does within science. But as much as people know about evolution, we also find the growth of corresponding myths. Simon Conway Morris is a paleontologist and evolutionary biologist who's new book is From Extraterrestrials to Animal Minds: Six Myths of Evolution. He is known as a defender of evolutionary convergence and adaptationism — even when there is a mass extinction, he argues, the resulting shake-up simply accelerates the developments evolution would have made anyway. We talk about this, and also about the possible role of God in an evolutionary worldview.

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Simon Conway Morris received his Ph.D. in geology from the University of Cambridge. He is currently an emeritus professor of evolutionary paleobiology in the Department of Earth Sciences at Cambridge. Among his awards are the Walcott Medal of the National Academy of Sciences and the Lyell Medal of the Geological Society of London.

• Cambridge web page
• Google scholar publications
• Wikipedia
• Amazon author page

Welcome to the August 2022 Ask Me Anything episode of Mindscape! These monthly excursions are funded by Patreon supporters (who are also the ones asking the questions). We take questions asked by Patreons, whittle them down to a more manageable number — based primarily on whether I have anything interesting to say about them, not whether the questions themselves are good — and sometimes group them together if they are about a similar topic.

Here is a link to the Mindscape Big Picture Scholarship. Please consider donating!

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The idea of an "interest rate" might seem mundane and practical, in comparison to our usual topics around here, but there is a profound philosophical idea lurking in the background: if you lend me money now against the promise of me paying you back more in the future, I am relating the different values that a certain sum has to me at different moments in time. Traditionally, the interest rates set by the government have been a major tool for influencing the economy, but in recent decades they have increasingly fallen near zero. John Quiggin relates this change to the shift from manufacturing to an information economy, and we talk about what that means for the public interest in having information be reliable and widely available. And yes, there is a bit about crypto.

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John Quiggin received his Ph.D. in economics from the University of New England. He is currently a VC Senior Fellow in Economics at the University of Queensland. He is a Fellow of the Econometric Society and the Academy of the Social Sciences in Australia. Among his books are Zombie Economics: How Dead Ideas Still Walk Among Us and Economics in Two Lessons: Why Markets Work So Well, and Why They Can Fail So Badly.

• Web site
• University of Queensland web page
• Google Scholar publications
• Amazon author page
• Wikipedia
• Twitter

Recent years have seen a revolution in the study of exoplanets, planets that orbit stars other than the Sun (or don't orbit stars at all). After a few tentative detections in the 1990s, dedicated instruments in the 2000s have now pushed the number of known exoplanets into the thousands, enough to begin to categorize their distribution and properties. Today's guest is John Asher Johnson, one of the leaders in this field. We talk about the various different ways that exoplanets can be detected, what we know about them know, and what might happen in the future.

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John Asher Johnson received his Ph.D. in astrophysics from the University of California, Berkeley. He is currently professor of astronomy at Harvard University. He is the founder and director of the Banneker Institute for summer undergraduate research. Among his awards are the Newton Lacy Pierce Prize from the American Astronomical Society. He is the author of How Do You Find an Exoplanet?

• Web site
• Harvard web page
• Google Scholar publications
• Wikipedia
• Twitter

We describe the world using language — we can't help it. And we all know that ordinary language is an imperfect way of communicating rigorous scientific statements, but sometimes it's the best we can do. Linguist N.J. Enfield argues that the difficulties run more deeply than we might ordinarily suppose. We use language as a descriptive tool, but its origins are found in more social practices — communicating with others to express our feelings and persuade them to agree with us. As such, the very structure of language itself reflects these social purposes, and we have to be careful not to think it provides an unfiltered picture of reality.

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N.J. Enfield received his Ph.D. in linguistics from the University of Melbourne. He is currently a professor of linguistics and Director of the Sydney Social Sciences and Humanities Advanced Research Centre at the University of Sydney. His recent book is Language vs. Reality: Why Language Is Good for Lawyers and Bad for Scientists.

• Web site
• University of Sydney web page
• Google Scholar publications
• Amazon author page

Welcome to the July 2022 Ask Me Anything episode of Mindscape! These monthly excursions are funded by Patreon supporters (who are also the ones asking the questions). I take the large number of questions asked by Patreons, whittle them down to a more manageable size — based primarily on whether I have anything interesting to say about them, not whether the questions themselves are good — and sometimes group them together if they are about a similar topic.

Big news this week! Mindscape is working with Bold.org to sponsor a college scholarship for students interested in studying the fundamental nature of reality. Listeners can find more details and donate here. Our immediate goal is to raise $10,000, and I will match the first $5,000, so this shouldn't be too hard for us here. Hopefully we can raise much more! And hopefully this will help encourage someone who might not otherwise have been able to study this kind of topic.

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The United States is suffering from an epidemic of tragic gun violence. While a political debate rages around the topic of gun control, it remains important to understand the causes and possible remedies for gun violence within the current system. Andrew Papachristos is a sociologist who uses applied network science to study patterns of street violence in urban areas. His research shows that such violence is highly non-random; knowing something about the social networks of perpetrators and victims can help identify who might be at heightened risk of gun violence. It's an interesting example of applying ideas from mathematics and computer science to real-world social situations.

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Andrew Papachristos received his Ph.D. in sociology from the University of Chicago. He is currently a professor of sociology at Northwestern University, and a faculty fellow at the Institute for Policy Research. He is also founding director of the Northwestern Neighborhoods and Networks Initiative.

• Web site
• Northwestern web page
• Google Scholar publications
• Wikipedia
• Twitter

All of us construct models of the world, and update them on the basis of evidence brought to us by our senses. Scientists try to be more rigorous about it, but we all do it. It's natural that this process will depend on what form that sensory input takes. We know that animals, for example, are typically better or worse than humans at sight, hearing, and so on. And as Ed Yong points out in his new book, it goes far beyond that, as many animals use completely different sensory modalities, from echolocation to direct sensing of electric fields. We talk about what those different capabilities might mean for the animal's-eye (and -ear, etc.) view of the world.

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Ed Yong received Masters and Bachelors degrees in zoology from Cambridge University, and an M.Phil. in biochemistry from University College London. He is currently a staff writer for The Atlantic. His work has appeared in National Geographic, the New Yorker, Wired, the New York Times, and elsewhere. He was awarded the Pulitzer Prize in explanatory journalism for his coverage of the COVID-19 pandemic. Among his other awards are the George Polk award for science reporting and the AAAS Kavli Science Journalism Award for in-depth reporting. His new book is An Immense World: How Animal Senses Reveal the Hidden Realms Around Us.

• Web site
• Stories at The Atlantic
• Pulitzer citation
• Wikipedia
• Amazon author page
• Twitter

Welcome to the June 2022 Ask Me Anything episode of Mindscape! We are inaugurating a slightly different publication schedule, in which these monthly AMA will take the place of one of the regular Monday episodes, rather than being in addition to all of them. A slight tweak that will hopefully make my obligations a little more manageable.

These monthly excursions are funded by Patreon supporters (who are also the ones asking the questions). I take the large number of questions asked by Patreons, whittle them down to a more manageable size — based primarily on whether I have anything interesting to say about them, not whether the questions themselves are good — and sometimes group them together if they are about a similar topic. Enjoy!

The 200th episode of Mindscape! Thanks to everyone for sticking around for this long. To celebrate, a solo episode discussing a set of issues naturally arising at the intersection of philosophy and physics: how to think about probabilities and expectations in a multiverse. Here I am more about explaining the issues than offering correct answers, although I try to do a bit of that as well.

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References:

• Guth, "Inflation and Eternal Inflation"
• Weinberg, "Living In the Multiverse"
• Susskind, "The Anthropic Landscape of String Theory"
• Carroll, Johnson, and Randall, "Dynamical Compactification from De Sitter Space"
• Sebens and Carroll, "Self-Locating Uncertainty and the Origin of Probability in Everettian Quantum Mechanics"
• Wald, "Asymptotic behavior of homogeneous cosmological models in the presence of a positive cosmological constant"
• Gibbons and Hawking, "Cosmological Event Horizons, Thermodynamics, and Particle Creation"
• Carroll and Chatwin-Davies, "Cosmic Equilibration: A Holographic No-Hair Theorem from the Generalized Second Law"
• Dyson, Kleban, and Susskind, "Disturbing Implications of a Cosmological Constant"
• Albrecht and Sorbo, "Can the Universe Afford Inflation?"
• Boddy, Carroll, and Pollack, "De Sitter Space Without Dynamical Quantum Fluctuations"
• Carroll, "Why Boltzmann Brains Are Bad"
• Aguirre, Carroll, and Johnson, "Out of Equilibrium: Understanding Cosmological Evolution to Lower-Entropy States"
• Carroll, "Beyond Falsifiabiliy: Normal Science in a Multiverse"
• Carter and McCrea, "The Anthropic Principle and its Implications for Biological Evolution"
• Leslie, "Doomsday Revisited"
• Gott, "Implications of the Copernican Principle for Our Future Prospects"
• Bostrom, Anthropic Bias
• Vilenkin, "The Principle of Mediocrity"
• Olum, "Conflict Between Anthropic Reasoning and Observation"
• Elga, "Self-Locating Belief and the Sleeping Beauty Problem"
• Lewis, "Sleeping Beauty: Reply to Elga"
• Hartle and Srednicki, "Are We Typical?"
• Hartle and Srednicki, "Science in a Very Large Universe"
• Neal, "Puzzles of Anthropic Reasoning Resolved Using Fully Non-Indexical Conditioning"

Time is everywhere, pervading each aspect of intellectual inquiry — from physics to philosophy to biology to psychology, and all the way up to politics. Considerations of time help govern a nation's self-conception, decide who gets to vote and enjoy other privileges, and put limits on the time spent in office. Not to mention the role of time as a precious commodity, one that is used up every time we stand in line or fill out a collection of forms. Elizabeth Cohen shines a light on the role of time in politics and citizenship, a topic that has been neglected by much political theorizing.

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Elizabeth Cohen received her Ph.D. in political science from Yale University. She is currently a professor of political science at Syracuse, and in March 2023 will move to Boston University to become the Maxwell Professor of United States Citizenship in the Department of Political Science. Among her awards are the Moynihan Award for Outstanding Research and Teaching at Syracuse and the Best Book award from the American Political Science section on Migration and Citizenship, for The Political Value of Time.

• Web page
• Google Scholar publications
• Wikipedia
• Amazon author page
• Twitter

The origin of life here on Earth was an important and fascinating event, but it was also a long time ago and hasn't left many pieces of direct evidence concerning what actually happened. One set of clues we have comes from processes in current living organisms, especially those processes that seem extremely common. The Krebs cycle, the sequence of reactions that functions as a pathway for energy distribution in aerobic organisms, is such an example. I talk with biochemist about the importance of the Krebs cycle to contemporary biology, as well as its possible significance in understanding the origin of life.

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Nick Lane received his PhD from the Royal Free Hospital Medical School. He is currently a professor of Evolutionary Biochemistry at University College London. He was a founding member of the UCL Consortium for Mitochondrial Research, and is Co-Director of the UCL Centre for Life's Origin and Evolution. He was awarded the 2009 UCL Provost's Venture Research Prize, the 2011 BMC Research Award for Genetics, Genomics, Bioinformatics and Evolution, the 2015 Biochemical Society Award, and the 2016 Royal Society Michael Faraday Prize and Lecture. His new book is Transformer: The Deep Chemistry of Life and Death.

• Web site
• UCL web page
• Google Scholar publications
• Amazon author page
• Wikipedia

The concept of the city is a crucial one for human civilization: people living in proximity, bringing in resources from outside, separated from the labors of subsistence so they can engage in the trade of goods and ideas. But we are still learning how cities grow and adapt to new conditions, as well as how we can best guide them to be livable as well as functional. I talk with urban scientist Catherine Brinkley about the structure of cities, including the fractal nature of their shapes, as well as what we can do to make cities thrive as much as possible.

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Catherine Brinkley received a Ph.D. in City and Regional Planning as well as a degree in Veterinary Medicine from the University of Pennsylvania. She is currently Associate Professor of Human Ecology and Faculty Director at the Center for Regional Change at the University of California, Davis. She has been awarded fellowships from the Fulbright Foundation, the National Center for Faculty Development and Diversity, and the Santa Fe Institute.

• Web site
• UC Davis web page
• Google Scholar publications
• Brinkley and Raj (2022), "Perfusion and Urban Thickness: The Shape of Cities"
• Twitter

Welcome to the May 2022 Ask Me Anything episode of Mindscape! These monthly excursions are funded by Patreon supporters (who are also the ones asking the questions). I take the large number of questions asked by Patreons, whittle them down to a more manageable size — based primarily on whether I have anything interesting to say about them, not whether the questions themselves are good — and sometimes group them together if they are about a similar topic. Enjoy!

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To say that event A causes event B is to not only make a claim about our actual world, but about other possible worlds — in worlds where A didn't happen but everything else was the same, B would not have happened. This leads to an obvious difficulty if we want to infer causes from sets of data — we generally only have data about the actual world. Happily, there are ways around this difficulty, and the study of causal relations is of central importance in modern social science and artificial intelligence research. Judea Pearl has been the leader of the "causal revolution," and we talk about what that means and what questions remain unanswered.

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Judea Pearl received a Ph.D. in electrical engineering from the Polytechnic Institute of Brooklyn. He is currently a professor of computer science and statistics and director of the Cognitive Systems Laboratory at UCLA. He is a founding editor of the Journal of Causal Inference. Among his awards are the Lakatos Award in the philosophy of science, The Allen Newell Award from the Association for Computing Machinery, the Benjamin Franklin Medal, the Rumelhart Prize from the Cognitive Science Society, the ACM Turing Award, and the Grenander Prize from the American Mathematical Society. He is the co-author (with Dana MacKenzie) of The Book of Why: The New Science of Cause and Effect.

• Web site
• Google Scholar publications
• Wikipedia
• Amazon author page
• Twitter

Evolution has equipped species with a variety of ways to travel through the air — flapping, gliding, floating, not to mention jumping really high. But it hasn't invented jet engines. What are the different ways that heavier-than-air objects might be made to fly, and why does natural selection produce some of them but not others? Richard Dawkins has a new book on the subject, Flights of Fancy: Defying Gravity by Design and Evolution. We take the opportunity to talk about other central issues in evolution: levels of selection, the extended phenotype, the role of adaptation, and how genes relate to organisms.

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Richard Dawkins received his Ph.D. in zoology from the University of Oxford. He is an emeritus fellow of New College, Oxford, where he was previously the Simonyi Professor for the Public Understanding of Science. He is an internationally best-selling author, whose books include The Selfish Gene, The Blind Watchmaker, and The God Delusion. He is a Fellow of the Royal Society and the Royal Society of Literature.

• Web site
• Richard Dawkins Foundation for Reason and Science
• Wikipedia
• Twitter
• Amazon author page

Humans are related to all other species here on Earth, but some are closer relatives than others. Primates, a group that includes apes, monkeys, lemurs, and others besides ourselves, are our closest relatives, and they exhibit a wide variety of behaviors that we can easily recognize. Frans de Waal is a leading primatologist and ethologist who has long studied cognition and collective behaviors in chimps, bonobos, and other species. His work has established the presence of politics, morality, and empathy in primates. His new book is Different: Gender Through the Eyes of a Primatologist.

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Frans de Waal received his Ph.D. in biology from Utrecht University. He is currently Charles Howard Candler Professor of Primate Behavior in the Department of Psychology at Emory University and director of the Living Links Center at the Yerkes National Primate Research Center. He is a member of the National Academy of Sciences, the American Academy of Arts and Sciences, and the American Philosophical Society. Among his awards are the Knight of the order of the Netherlands Lion, the Galileo Prize, ASP Distinguished Primatologist, and the PEN/EO Wilson Literary Science Writing Award, not to mention an Ig Nobel Prize.

• Web page
• Center for the Advanced Study of Ape and Human Evolution
• Facebook public page
• Google Scholar publications
• Wikipedia
• Amazon author page

Every time we make an important decision, it's hard not to wonder how things would have turned out had we chosen differently. The set of all those hypothetical lives is a kind of "multiverse" — not one predicted by quantum mechanics or cosmology, but a space of possibilities that is ripe for contemplation. In their new movie Everything Everywhere All At Once, Daniels (the collective moniker for writer/directors Daniel Kwan and Daniel Scheinert) use this idea to tell the story of Evelyn (Michelle Yeoh), who is the "worst" of all her avatars in the multiverse. We talk about philosophy, filmmaking, and how we should all strive to be kind amidst the chaos.

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Daniel Kwan and Daniel Scheinert are writers and directors collectively known as Daniels. They met and formed a collaboration while in film school at Emerson College. They have directed a number of music videos for artists such as DJ Snake and Tenacious D. Their first feature film was Swiss Army Man, starring Daniel Radcliffe.

• Web site
• IMDb: Kwan, Scheinert
• Twitter

Welcome to the April 2022 Ask Me Anything episode of Mindscape! These monthly excursions are funded by Patreon supporters (who are also the ones asking the questions). I take the large number of questions asked by Patreons, whittle them down to a more manageable size — based primarily on whether I have anything interesting to say about them, not whether the questions themselves are good — and sometimes group them together if they are about a similar topic. Enjoy!

Randomness and probability are central to modern physics. In statistical mechanics this is because we don't know everything about the distribution of atoms and molecules in a fluid, so we consider a probability distribution over what they might be; in quantum mechanics it's because the theory only lets us predict measurement outcomes probabilistically. Physicist Nicole Yunger Halpern explains how we've been lagging behind at bringing these two theories together, and how recent progress is changing the landscape of how we think about the microworld.

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Nicole Yunger Halpern received her Ph.D. in physics from Caltech. She is currently a NIST physicist and Adjunct Assistant Professor of Physics and IPST at the University of Maryland. Her Ph.D. thesis won the international Ilya Prigogine Prize for a thermodynamics dissertation. As a postdoc she received the International Quantum Technology Emerging Researcher Award. Her new book is Quantum Steampunk: The Physics of Yesterday's Tomorrow.

• Lab web site
• University of Maryland QuICS web page
• Google Scholar
• Blog
• Amazon author page
• Twitter

The future grows out of the present, but it manages to consistently surprise us. How can we get better at anticipating and preparing for what the future can be like? Jane McGonigal started out as a game designer, working on the kinds of games that represent miniature worlds with their own rules. This paradigm provides a useful way of thinking about predicting the future: imagining changes in the current world, then gaming out the consequence, allowing real people to produce unexpected emergent outcomes. We talk about the lessons learned that anyone can use to better prepare their brain for the future to come.

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Jane McGonigal received her Ph.D. in performance studies from the University of California, Berkeley. She is currently a writer and Director of Games Research and Development at the Institute for the Future. She teaches a course at Stanford on How to Think Like a Futurist. She has developed several games, including SuperBetter, a game she designed to improve health and resilience after suffering from a concussion. Her recent book is Imaginable: How to See the Future Coming and Feel Ready for Anything–Even Things That Seem Impossible Today.

• Web site
• Institute for the Future page
• Urgent Optimists
• Amazon.com author page
• Wikipedia
• Twitter

Biological organisms are pretty good at healing themselves, but their abilities fall short in crucial ways. Planaria can be cut into pieces, and each piece will regrow into an entire organism; but for most advanced animals, loss of a limb becomes a permanent condition. But why should that necessarily be so, if an organism's genome knows what it's supposed to look like? Lea Goentoro's lab has recently produced surprising results that indicate that it's easier than you might think to coax animals into regenerating limbs.

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Lea Goentoro received her Ph.D. in chemical engineering from Princeton University. She is currently Professor of Biology at Caltech. Her research involves how biological systems function and develop across a variety of scales, including perception, organization, and self-repair.

• Lab web page
• Caltech web page
• Google Scholar publications
• "A conserved strategy for inducing appendage regeneration in moon jellyfish, Drosophila, and mice"

All societies grant more power to some citizens, and there is always a temptation to use that power for the benefit of themselves rather than for the greater good. Power corrupts, we are told — but to what extent is that true? Would any of us, upon receiving great power, be tempted by corruption? Or are corruptible people drawn to accrue power? Brian Klaas has investigated these questions by looking at historical examples and by interviewing hundreds of people who have been in this position. He concludes that power can corrupt, but it doesn't necessarily do so — we can construct safeguards to keep corruption to a minimum.

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Brian Klaas received his D.Phil. in Politics from the University of Oxford. He is currently Associate Professor in Global Politics at University College London and a columnist for The Washington Post. His new book is Corruptible: Who Gets Power and How it Changes Us. He is host of the Power Corrupts podcast.

• Web site
• UCL web page
• Washington Post columns
• Wikipedia
• Amazon author page
• Twitter
• New Zealand Police recruitment video

Welcome to the March 2022 Ask Me Anything episode of Mindscape! These monthly excursions are funded by Patreon supporters (who are also the ones asking the questions). I take the large number of questions asked by Patreons, whittle them down to a more manageable size — based primarily on whether I have anything interesting to say about them, not whether the questions themselves are good — and sometimes group them together if they are about a similar topic. Enjoy!

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If extraterrestrial life is out there — not just microbial slime, but big, complex, macroscopic organisms — what will they be like? Movies have trained us to think that they won't be that different at all; they'll even drink and play music at the same cafes that humans frequent. A bit of imagination, however, makes us wonder whether they won't be completely alien — we have zero data about what extraterrestrial biology could be like, so it makes sense to keep an open mind. Arik Kershenbaum argues for a judicious middle ground. He points to constraints from physics and chemistry, as well as the tendency of evolution to converge toward successful designs, as reasons to think that biologically complex aliens won't be utterly different from us after all.

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Arik Kershenbaum received his Ph.D. in Evolutionary Biology and Ecology from the University of Haifa. He is currently College Lecturer and Director of Studies at Girton College, University of Cambridge. He is the author of The Zoologist's Guide to the Galaxy: What Animals on Earth Reveal About Aliens — and Ourselves.

• Web site
• Cambridge web page
• Google Scholar publications
• Amazon author page
• Twitter

We're pretty well-calibrated when it comes to dealing with common, everyday-level setbacks. But our brains aren't naturally equipped for dealing with unlikely but world-catastrophic disasters. Yet such threats are real, both natural and human-induced. We need to collectively get better at anticipating and preparing for them, at the level of political action. Andrew Leigh is an academic and author who now serves in the Parliament of Australia. We discuss how to move the conversation about existential risks from the ivory tower to implementation in real policies.

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Andrew Leigh received his Ph.D. in Public Policy from the Kennedy School of Government at Harvard University. He is a member of the Australian House of Representatives representing Fenner. He was previously a professor of economics at Australian National University, and has served as Shadow Assistant Minister for Treasury and Charities. His recent book is What's the Worst That Could Happen? Existential Risk and Extreme Politics.

• Web site
• Research web site
• Wikipedia
• Twitter

Advances in technology have gradually been extending the human self beyond its biological extent, as we augment who we are with a variety of interconnected devices. There are obvious benefits to this — it lets us text our friends, listen to podcasts, and not get lost in strange cities. But as it changes how we interact with other people, it's important to consider the possible downsides. Sherry Turkle is a psychologist and writer who specializes in the relationship between humans and their technology. She makes the case for not forgetting about empathy, conversation, and even the occasional imperfection in how we present ourselves to the world.

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Sherry Turkle received her Ph.D. in sociology and personality psychology from Harvard University. She is currently Abby Rockefeller Mauzé Professor of the Social Studies of Science and Technology in the Program in Science, Technology, and Society at MIT, founding director of the MIT Initiative on Technology and Self, and a licensed clinical psychologist. Among her awards are a Guggenheim Fellowship, a Rockefeller Humanities Fellowship, the Harvard Centennial Medal, and she was named "Woman of the Year" by Ms. Magazine. Her new book is The Empathy Diaries: A Memoir.

• Web site
• MIT web page
• Wikipedia
• Amazon author page
• Twitter

One of the brilliant achievements of Darwin's theory of natural selection was to help explain apparently "purposeful" or "designed" aspects of biology in a purely mechanistic theory of unguided evolution. Features are good if they help organisms survive. But should we put organisms at the center of our attention, or the genetic information that governs those features? Arvid Ågren helps us understand the attraction of the "selfish gene" view of evolution, as well as its shortcomings. This biological excursion has deep connections to philosophical issues of levels and emergence.

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Arvid Ågren received his Ph.D. in Ecology and Evolutionary Biology from the University of Toronto. He is currently a Wenner-Gren Fellow at the Evolutionary Biology Centre at Uppsala University. Previously he worked at Cornell and Harvard. His recent book is The Gene's-Eye View of Evolution.

• Web site
• Google Scholar publications
• Amazon author page
• Twitter

Artificial intelligence is everywhere around us. Deep-learning algorithms are used to classify images, suggest songs to us, and even to drive cars. But the quest to build truly "human" artificial intelligence is still coming up short. Gary Marcus argues that this is not an accident: the features that make neural networks so powerful also prevent them from developing a robust common-sense view of the world. He advocates combining these techniques with a more symbolic approach to constructing AI algorithms.

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Gary Marcus received his Ph.D. in cognitive science from MIT. He is founder and CEO of Robust.AI, and was formerly a professor of psychology at NYU as well as founder of Geometric Intelligence. Among his books are Rebooting AI: Building Machines We Can Trust (with Ernest Davis).

• Web site
• Wikipedia
• Twitter
• Amazon.com author page

Welcome to the February 2022 Ask Me Anything episode of Mindscape! These monthly excursions are funded by Patreon supporters (who are also the ones asking the questions). I take the large number of questions asked by Patreons, whittle them down to a more manageable size — based primarily on whether I have anything interesting to say about them, not whether the questions themselves are good — and sometimes group them together if they are about a similar topic. Enjoy!

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Modern particle physics is a victim of its own success. We have extremely good theories — so good that it's hard to know exactly how to move beyond them, since they agree with all the experiments. Yet, there are strong indications from theoretical considerations and cosmological data that we need to do better. But the leading contenders, especially supersymmetry, haven't yet shown up in our experiments, leading some to wonder whether anthropic selection is a better answer. Michael Dine gives us an expert's survey of the current situation, with pointers to what might come next.

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Michael Dine received his Ph.D. in physics from Yale University. He is Distinguished Professor of Physics at the Santa Cruz Institute for Particle Physics, University of California, Santa Cruz. Among his awards are fellowships from the Sloan Foundation, Guggenheim Foundation, American Physical Society, and American Academy of Arts and Sciences, as well as the Sakurai Prize for theoretical particle physics. His new book is This Way to the Universe: A Theoretical Physicist's Journey to the Edge of Reality.

• Web page
• Publications at iNspire
• Wikipedia
• Amazon author page

Reality is just out there — but how we perceive reality and talk about it depends on choices we human beings make. We decide (consciously or not) to conceptualize the world in certain ways, whether it's because those ways provide elegant predictive descriptions or because they serve a more subtle political purpose. To get at the true nature of reality, therefore, it's important to think about which aspects of it are socially constructed, and why. I talk with Sally Haslanger about these issues, and the techniques we can use to understand the world and make it a better place.

Update (22 March): Our discussion here could have (and did) leave some listeners with the wrong impression of how Sally and I feel about trans rights -- we are entirely for them! My fault for not making things more clear during the conversation. So I have added a brief note during the podcast intro to make our position perfectly explicit. Thanks to everyone who commented.

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Sally Haslanger received her Ph.D. in philosophy from the University of California, Berkeley. She is currently the Ford Professor of Philosophy at the Massachusetts Institute of Technology. Among her awards are the Carus Lectureship, the Distinguished Woman Philosopher award, and a Guggenheim Fellowship. She is the author of several books, including Resisting Reality: Social Construction and Social Critique.

• Web site
• MIT faculty page
• PhilPeople profile
• Google Scholar publications
• Amazon author page
• Wikipedia

A good story takes you on an emotional journey, with ups and downs along the way. Thanks to science, we can quantify that. Peter Dodds works on understanding the structure of stories and other strings of words (including Twitter) by analyzing the valence of individual words, then studying how they are strung together in different kinds of stories. Understanding these structures offers powerful insight into how people communicate and how to reach them. As Peter says, "Never bring statistics to a story fight."

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Peter Dodds received his Ph.D. in mathematics from the Massachusetts Institute of Technology. He is currently a professor of computer science at the University of Vermont and Director of the Vermont Complex Systems Center. He has won multiple teaching awards, and was elected a Fellow of the Network Science Society.

• Web site
• University of Vermont faculty page
• Computational Story Lab
• Google Scholar publications
• Wikipedia
• Twitter

Being a human is tricky. There are any number of unwritten rules and social cues that we have to learn as we go, but that we ultimately learn to take for granted. Camilla Pang, who was diagnosed with autism spectrum disorder at age eight, had a harder time than most, as she didn't easily perceive the rules of etiquette and relationships that we need to deal with each other. But she ultimately figured them out, with the help of analogies and examples from different fields of science. We talk about these rules, and how science can help us think about them.

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Camilla Pang received her Ph.D. in computational biology from University College London. She is currently a postdoctoral researcher in pharmaceuticals and a volunteer cancer researcher at the Francis Crick Institute. She was awarded the Royal Society Prize for Science Books in 2020 for her book Explaining Humans: What Science Can Teach Us about Life, Love, and Relationships (US title: An Outsider's Guide to Humans: What Science Taught Me about What We Do and Who We Are).

• Web site
• Wikipedia
• Twitter
• Amazon author page

Human beings like to divide themselves into groups, and then cooperate, socialize, and reproduce with members of their own group. But they're not very absolutist about it; groups tend to gradually (or suddenly) intermingle, as people explore, intermarry, or conquer each other. David Reich has pioneered the use of genetic data in uncovering the history of ancient humanity: what groups existed where and when, and how they interacted. The result is a picture of churning populations in constant flux, including "ghost populations" that no longer exist today.

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David Reich received his Ph.D. in zoology from the University of Oxford. He is currently a professor of genetics at Harvard Medical School. Among his awards are the Dan David Prize, the National Academy of Sciences Award in Molecular Biology, the Wiley Prize, the Darwin-Wallace Medal, and the Massry Prize. He is the author of Who We Are and How We Got Here: Ancient DNA and the New Science of the Human Past.

• Lab web page
• Harvard faculty page
• Publications
• Wikipedia

Are numbers real? What does that even mean? You can't kick a number. But you can talk about numbers in useful ways, and we use numbers to talk about the real world. There's surely a kind of reality there. On the other hand, Luke Skywalker isn't a real person, but we talk about him all the time. Maybe we can talk about unreal things in useful ways. Jody Azzouni is one of the leading contemporary advocates of nominalism, the view that abstract objects are not "things," they are merely labels we use in talking about things. A deeply philosophical issue, but one that has implications for how we think about physics and the laws of nature.

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Jody Azzouni received his Ph.D. in philosophy from the City University of New York. He is currently a professor of philosophy at Tufts University. In addition to his philosophical work, he is an active writer of fiction and poetry.

• Web site
• Tufts web page
• PhilPeople profile
• Amazon author page
• Wikipedia
• PoemHunter page

As each December comes to a close, we wrap up another year of podcasts with the Mindscape Holiday Message. Nothing too profound, just some thoughts that wouldn't fit easily into a regular podcast. This year we're talking about academic disciplines and cocktails. What do they have in common, you may ask? Listen and find out!

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Mindscape will be dark on Monday December 27, and will resume regular programming on Monday January 3. Here are the two books I mentioned in the podcast, and the one essay:

• The Aviary Cocktail Book
• Death & Co Modern Classic Cocktails
• Steven Weinberg, "Against Philosophy"

Welcome to the December 2021 Ask Me Anything episode of Mindscape! These monthly excursions are funded by Patreon supporters (who are also the ones asking the questions). I take the large number of questions asked by Patreons, whittle them down to a more manageable size — based primarily on whether I have anything interesting to say about them, not whether the questions themselves are good — and sometimes group them together if they are about a similar topic. Note that there will be no January AMA, for purposes of a holiday break. Enjoy!

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When it comes to thinking about quantum mechanics, there are levels. One level is shut-up-and-calculate: find a wave function, square it to get a probability. One level is foundational: dig deeply into the underlying ontology. But there's a level in between, long neglected but recently coming to life. In this level you think about — or do experiments with — entangled quantum systems in the real world, putting entanglement to use. Monika Schleier-Smith is an experimental physicist specializing in cold atoms, which can be both entangled and manipulated. We discuss how to use such systems to study everything from metrology to quantum gravity.

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Monika Schleier-Smith received her Ph.D. in physics from the Massachusetts Institute of Technology. She is currently an Associate Professor of Physics at Stanford University. Among her awards are a MacArthur Fellowship, a Sloan Fellowship, and the I. I. Rabi Prize in Atomic, Molecular, and Optical Physics from the American Physical Society.

• Web site
• Stanford web page
• Google Scholar publications
• Wikipedia