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

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.

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• Northwestern web page
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• 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.

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• Stories at The Atlantic
• Pulitzer citation
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• Amazon author page
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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.

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• Google Scholar publications
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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.

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• 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.

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• 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.

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• 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.

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