310 | Marc Kamionkowski on Dark Energy and Cosmic Anomalies

310 | Marc Kamionkowski on Dark Energy and Cosmic Anomalies

Cosmologists were, let us be honest, pretty stunned in 1998 when observations revealed that the universe is accelerating. There was an obvious plausible explanation, the cosmological constant proposed by Einstein, which is equivalent to a constant vacuum energy pervading space. But the cosmological constant was known to be enormously smaller than its "natural" value, and it seems fine-tuned for it to be so small but not yet zero. Once burned, twice shy, and since then we have been looking for evidence that the dark energy might not be strictly constant, even though that's even more fine-tuned. We talk to cosmologist Marc Kamionkowski about recent evidence that dark energy might be changing with time, and what this might have to do with the Hubble tension and other cosmic anomalies.

Blog post with transcript: https://www.preposterousuniverse.com/podcast/2025/03/31/310-marc-kamionkowski-on-dark-energy-and-cosmic-anomalies/

Support Mindscape on Patreon.

Marc Kamionkowski received his Ph.D. in physics from the University of Chicago. He is currently the William R. Kenan Jr. Professor in the Department of Physics and Astronomy at Johns Hopkins University. Among his prizes are the Gruber Cosmology Prize, the Dannie Heineman Prize for Astrophysics, membership in the National Academy of Science, and a Guggenheim Fellowship.


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318 | Edward Miguel on the Developing Practice of Development Economics

318 | Edward Miguel on the Developing Practice of Development Economics

Economics is seeing an upsurge in the importance of controlled, reproducible empirical studies. One area where this has had a great impact is on development economics, which studies the economies of low- and middle-income societies. Edward Miguel has been at the forefront of both the revolution in empirical methods, and in applying those techniques to alleviating poverty in sub-Saharan Africa and elsewhere.Blog post with transcript: https://www.preposterousuniverse.com/podcast/2025/06/16/318-edward-miguel-on-the-developing-practice-of-development-economics/Support Mindscape on Patreon.Edward Miguel received his Ph.D. in economics from Harvard university. He is currently Distinguished Professor of Economics and Oxfam Professor in Environmental and Resource Economics at the University of California, Berkeley. He is also Faculty co-Director of the Center for Effective Global Action and a Faculty Research Associate of the National Bureau of Economic Research. Among his awards are the Frisch Medal of the Econometric Society, the Kenneth Arrow Prize of the International Health Economics Association, and multiple teaching awards.Web siteBerkeley web pageGoogle Scholar publicationsWikipediaSee Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

16 Juni 1h 20min

317 | Nicole Rust on Why Neuroscience Hasn't Solved Brain Disorders

317 | Nicole Rust on Why Neuroscience Hasn't Solved Brain Disorders

The human brain is extremely complicated, but decades of careful neuroscientific research have revealed quite a bit about how it works, including how certain genes affect particular brain behaviors. Nevertheless, this progress has not led to quite as much improvement in the treatment of brain disorders as we might expect. I talk with neuroscientist Nicole Rust about why this is and how to improve the situation, as discussed in her new book Elusive Cures.Blog post with transcript: https://www.preposterousuniverse.com/podcast/2025/06/09/317-nicole-rust-on-why-neuroscience-hasnt-solved-brain-disorders/Support Mindscape on Patreon.Nicole C. Rust received her Ph.D. in neuroscience from New York University. She is currently a professor of psychology at the University of Pennsylvania. She is also a contributing editor at The Transmitter and an editor at BrainFacts.org. Among her awards are the Troland Research Award from the National Academy of Sciences.Web siteUPenn web pageGoogle Scholar publicationsWikipediaBlueskySee Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

9 Juni 1h 14min

AMA | June 2025

AMA | June 2025

Welcome to the June 2025 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!Blog post with AMA questions and transcript: https://www.preposterousuniverse.com/podcast/2025/06/02/ama-june-2025/Support Mindscape on Patreon.See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

2 Juni 3h 23min

316 | Niayesh Afshordi and Phil Halper

316 | Niayesh Afshordi and Phil Halper

Einstein's general theory of relativity, plus some reasonable assumptions about the universe and what it's made of, has a remarkable implication: that as we trace cosmic evolution into the far past, we ultimately hit a singularity of infinite density and curvature, the Big Bang. Did that really happen? Einstein's theory is classical, after all, and the world is quantum. And whose to say what assumptions are reasonable? Niayesh Afshordi and Phil Halper have written a new book, Battle of the Big Bang: The New Tales of Our Cosmic Origins, that surveys all of the mind-bending possibilities.Blog post with transcript: https://www.preposterousuniverse.com/podcast/2025/05/26/316-niayesh-afshordi-and-phil-halper-on-the-big-bang-and-before/Support Mindscape on Patreon.Niayesh Afshordi received a Ph.D. in astrophysics from Princeton University. He is currently a professor of physics and astronomy at the University of Waterloo, and associate faculty in the cosmology and gravitation group at the Perimeter Institute for Theoretical Physics.Web sitePerimeter web pageWaterloo web pageGoogle scholar publicationsPhil Halper is a science communicator and a fellow of the Royal Astronomical Society. His astronomy images have been featured in major media outlets including The Washington Post, the BBC, and The Guardian, and he has published several papers in peer-reviewed journals.YouTube channel (Skydivephil)See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

26 Maj 1h 28min

315 | Branden Fitelson on the Logic and Use of Probability

315 | Branden Fitelson on the Logic and Use of Probability

Every time you see an apple spontaneously break away from a tree, it falls downward. You therefore claim that there is a law of physics: apples fall downward from trees. But how can you really know? After all, tomorrow you might see an apple that falls upward. How is science possible at all? Philosophers, as you might expect, have thought hard about this. Branden Fitelson explains how a better understanding of probability can help us decide when new evidence is actually confirming our beliefs.Blog post with transcript: https://www.preposterousuniverse.com/podcast/2025/05/19/315-branden-fitelson-on-the-logic-and-use-of-probability/Support Mindscape on Patreon.Branden Fitelson received a Ph.D. in philosophy from the University of Wisconsin-Madison. He is currently Distinguished Professor of Philosophy at Northeastern University. He is a co-founder of the Formal Epistemology Workshop, and winner of the 2020 Wolfram Innovator Award.Web siteNortheastern web pagePhilPapers profileGoogle Scholar publicationsWikipediaSee Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

19 Maj 1h 28min

314 | Karen Lloyd on the Deep Underground Biosphere

314 | Karen Lloyd on the Deep Underground Biosphere

There are living creatures dwelling deep below the surface of the Earth, as deep as we are able to drill. These hearty microorganisms are related to more familiar life forms on land and under water, but the operate and survive in ways that are quite different from what we're familiar with. They live off of nutrients that have penetrated from the surface, or sometimes off of pure electrons. Karen Lloyd is a scientist who has traveled around the world studying these organisms, as she explains in her new book Intraterrestrials: Discovering the Strangest Life on Earth.Blog post with transcript: https://www.preposterousuniverse.com/podcast/2025/05/12/314-karen-lloyd-on-the-deep-underground-biosphere/Support Mindscape on Patreon.Karen Lloyd received a Ph.D. in marine sciences from the University of North Carolina. She is currently the Wrigley Chair in Environmental Studies and Professor of Earth Sciences at the University of Southern California. Among her awards are a Sloan Fellowship, a Simons Early Career Investigator, and a NASA Early Career Fellowship.Lab web siteUSC web pageGoogle Scholar publicationsBlueskySee Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

12 Maj 1h 9min

313 | Eric Topol on the Changing Face of Medicine and Aging

313 | Eric Topol on the Changing Face of Medicine and Aging

Medical science is advancing at an astonishing rate. Today we talk with leading expert Eric Topol about two aspects of this story. First, the use of artificial intelligence in medicine, especially in diagnostics. This is an area that is a perfect match between an important question and the capabilities of machine learning, to the point where AI can out-perform human doctors. And second, our understanding of aging and what to do about it. Eric even gives some actionable advice on how to live more healthily into our golden years.Blog post with transcript: https://www.preposterousuniverse.com/podcast/2025/05/05/episode-313-eric-topol-on-the-changing-face-of-medicine-and-aging/Support Mindscape on Patreon.Eric Topol received and M.D. from the University of Rochester. He is currently the Gary and Mary West Chair of Innovative Medicine in the Department of Translational Medicine at Scripps Research. He is also the Founder, Scripps Research Translational Institute, and Senior Consultant, Scripps Clinic, Division of Cardiovascular Diseases. Among his awards are the Hutchinson Medal from the University of Rochester and membership in the National Academy of Sciences. His books include Deep Medicine: How Artificial Intelligence Can Make Healthcare Human Again, and Super Agers: An Evidence-Based Approach to Longevity.Web siteScripps web pageGoogle Scholar publicationsWikipediaSubstackBlueskySee Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

5 Maj 1h 12min

AMA | May 2025

AMA | May 2025

Welcome to the May 2025 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!Blog post with AMA questions and transcript: https://www.preposterousuniverse.com/podcast/2025/04/28/ama-may-2025/Support Mindscape on Patreon.See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

28 Apr 3h 38min

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