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Lawrence M. Krauss

The Origins Podcast features in-depth conversations with some of the most interesting people in the world about the issues that impact all of us in the 21st century. Host, theoretical physicist, lecturer, and author, Lawrence M. Krauss, will be joined by guests from a wide range of fields, including science, the arts, and journalism. The topics discussed on The Origins Podcast reflect the full range of the human experience - exploring science and culture in a way that seeks to entertain, educate, and inspire. lawrencekrauss.substack.com 

lawrencekrauss.substack.com

The Origins Podcast with Lawrence Krauss

Happy August! . Heading back to North America as we just concluded our Origin Project Adventure to Cyrpus and Greece, where we felt the heat, and avoided some wildfires while having some amazing positive experiences as well with an amazing group of 26 travelers. Please stay safe and try and stay cool this month. 

To help distract you from the heat, I hope you will enjoy this latest conversation about new discoveries in science with Sabine Hossenfelder. As always, we try and deconstruct the facts behind the headlines, and also explore new strange corners of our universe. 

This episode begins with some new observations of the Bullet Cluster of galaxies. This cluster contains two galaxies that have collided, and seems to have provided evidence for exotic dark matter that has passed through the collision unscathed. Not so, says a new analysis, which claims evidence for more dark matter in the form of black holes and other less visible normal matter. There are strong reasons to be skeptical however, as both Sabine and I agree.

Speaking of black holes, a new analysis of collisions of black holes at the terrestrial gravitational wave detectors proposes a solution to the mystery of how black holes in a so-called forbidden gap between 10-20 solar masses and more than 50 solar masses have formed. They provide evidence that some of the black holes observed in collisions have been built up from earlier collisions with other black holes. This hierarchical growth could potentially explain how very large black holes in the early universe form, though it is a long way from 50 solar masses to 1 billion solar masses!

Strange goings on at the largest scales of the universe continue to be claimed, as yet another study argues for an unexpected and unexplained cosmic spatial asymmetry. It is hard to reconcile this with the observed uniformity of the universe on the largest scales we can observe via the Cosmic Microwave Background. As a result, it is too early to get excited, even if newspaper reporters love to report on claims that fly in the face of the standard model of cosmology.

The Vera Rubin Space Observatory has started its 10 year project to monitor a huge swath of sky every night looking for things that go bump in the night. On the first night, they found a few hundred thousand possible events. With a 10 year movie of the cosmos who knows what they will discover. 

Sabine introduced me to an article about Quantum Batteries. Are they going to be useful, or just another cute example of how quantum mechanics produces strange phenomena? Time will tell. 

Finally, I couldn’t resist introducing a story about cockroaches with nervous system implants that allow their motion to be remote controlled by experimenters, with tiny diving suits attached that allow them to breathe underwater for extended periods. It is claimed that they may help in undersea rescue.. Wow! Maybe so… What will they think of next?

Until the next time.. enjoy!

As always, an ad-free video version of this podcast is also available to paid Critical Mass subscribers. Your subscriptions support the non-profit Origins Project Foundation, which produces the podcast. The audio version is available free on the Critical Mass site and on all podcast sites, and the video version will also be available on the Origins Project YouTube.
 

Get full access to Critical Mass at lawrencekrauss.substack.com/subscribe

What's New in Science with Sabine and Lawrence | Cosmic oddities, Black Hole normalities, Quantum Batteries, and remote-controlled cockroaches

I remember when my friend, journalist Claire Berlinski, first contacted me about a tragic situation regarding a family trapped in Afghanistan after the Taliban takeover. She knew that I had helped a young girl interested in physics escape to the US to study years earlier and hoped that I might assist in this case. If ever one imagined a family appropriate to bring to safety, this would be the one. The mother was a women’s rights lawyer before the takeover, and the husband worked for a French firm. The Taliban had broken into the Bar Association Office and found records of lawyers, who were being sought for arrest. One older son, and five young daughters in danger of being married off if they were discovered.

Their original escape plan was foiled when the airport was bombed just before their planned departure. Because Claire lives in Frances the older boy had reached out to her for help, and she sent out a call to her followers to provide financial assistance to help the family.

Claire contacted me because she knew I now lived in Canada, which has a well-established refugee program. In spite of this, for two years I was not able to find a single sponsoring agency who had a sufficiently large slot allocation to assist. Finally, after over a year, with five generous individuals who agreed to act as guarantors, Jewish Immigrant Aid Services in Toronto indicated they had the slots and would sponsor a refugee application for the family, provided we raised the necessary funds to guarantee support for family for their first year in Canada—a government requirement. After five months of fundraising, we achieved the goal, and the full application was submitted to the government of Canada. 

I have always found it poetic that the organization in Canada that has been willing to help save this Muslim family is a Jewish organization. Perhaps, in the midst of all the horrible antisemitism that has blossomed in the world over the past years, this provide a useful example that religious differences need not always be a source of discord and hatred. 

That was 18 months ago. In spite of having fulfilled at the requirements, the backlog of cases is such that we knew it could take up to two years for the application to be processed. In the interim the family was able to travel to Pakistan. But their visas have expired and Pakistan is now deporting Afghan refugees back to Afghanistan. 

The family is in hiding in Pakistan, not able to leave their house. The girls are growing and one of them managed to learn enough English to get a prized scholarship to study online at a US university abroad, where she is studying psychology, as the law degree that she really wants is not available. 

The family agreed to be interviewed for this podcast. Their images have been washed out for their protection, and their names have been changed as well. We are hoping this podcast will help spur some of you to provide support through Claire’s online site to help provide essentials for the family while they are in hiding, and that it might also help motivate some of you who might live in Canada to help us lobby the government to ensure that their case is resolved as quickly as possible. 

Thanks for watching, or listening, and for any help you can provide. Here is a gofundme link to help support them. https://www.gofundme.com/f/please-help-five-afghan-girls-get-to-safety

As always, an ad-free video version of this podcast is also available to paid Critical Mass subscribers. Your subscriptions support the non-profit Origins Project Foundation, which produces the podcast. The audio version is available free on the Critical Mass site and on all podcast sites, and the video version will also be available on the Origins Project YouTube.
 

Get full access to Critical Mass at lawrencekrauss.substack.com/subscribe

Saving a Family from Afghanistan

I began this lecture by saying I was daunted by what I was about to talk about. There are several reasons for this. 

First, I will lead you through the development of what was certainly most important theoretical development in the 19th century, and what could easily be considered the most important mathematical framework in all of physics. Second, this development affected our modern picture of the universe more than almost any other. Next, this development made our modern technological society possible. And finally, it allowed a calculation that ultimately unveiled the true nature of light. A calculation we will perform together during this lecture

I am going to take you through what is often taught in a whole semester course in physics. So hold onto your hats. Take it step by step. I think the reward of understanding will be worth the effort. I hope at the end of this lecture you agree with me. 

This month I will be traveling with the Origins Project and a group of 27 intrepid travelers to Cyprus and Greece. So the next Origins podcast will not air until August. I hope your July is enjoyable. 

As always, an ad-free video version of this podcast is also available to paid Critical Mass subscribers. Your subscriptions support the non-profit Origins Project Foundation, which produces the podcast. The audio version is available free on the Critical Mass site and on all podcast sites, and the video version will also be available on the Origins Project YouTube.
 

Get full access to Critical Mass at lawrencekrauss.substack.com/subscribe

Physics for Everyone, Lecture 5: The Unification that Changed the World

I think this was one of my most enjoyable dialogues in our What’s new series. Maybe Sabine and I are getting more used to each other’s cadence and interests or maybe it was the subject matter. Either way, I think you will find this to be a fascinating and provocative discussion of science at the forefront, and at the not-so-forefront, because that science is interesting too!

We began our discussion describing a new finding of a Giant Ring of galaxies billions of light years across in the sky. The key questions are: Is it real? And is it surprising? We both have slightly different takes on this.

Next we described a new measurement of the strength of gravity on scales from 80 to 800 million light years in distance. And guess what? Gravity falls off just like Newton predicted! This may seem like a big yawn, but one of the most popular models that claims to do away with dark matter would imply that Gravity would fall off differently on these scales. Does this new result kill that idea? Stay tuned.

Microsoft, which has cried wolf a number of times so far when it comes to something called Majorana qubits as the basis of a new viable quantum computer just published a new paper claiming they finally have it. Sabine and I discuss why we are both still skeptical, but why the effort is worth it.

Next, CERN, the large European particle physics laboratory, and the world particle physics community seem to have converged on plans for building a huge new accelerator in the current CERN site.. this time involving an underground ring 91 km in circumference, in which electrons and positrons would collide to explore the detailed properties of the Higgs particle. Is the effort worth it? Again, Sabine and I have slightly different takes on this.

Fusion power, which we have talked about in a number of earlier episodes, continues to tempt humanity with the promise of unlimited energy. Many people, myself included, have tended to argue that fusion seems to be 25 years in the future, and may always be 25 years in the future. But many new efforts are underway, so who knows. Unfortunately, a group of economists has analyzed fusion in the context of other large energy programs and have argued that even if we can achieve it, it may not be as economically viable as many claim. 

Finally, one day Richard Feynman went to a Thai restaurant with his young companion Ralph Leighton, and wondered what he should order. Should it be the same old dish he loved or something new. An equation filled napkin later, and he had the answer. Fifty years later some cognitive scientists resurrected Feynman’s napkin and explained it, and argued it might have important implications in other social situations. Such is the power of science.

As always, an ad-free video version of this podcast is also available to paid Critical Mass subscribers. Your subscriptions support the non-profit Origins Project Foundation, which produces the podcast. The audio version is available free on the Critical Mass site and on all podcast sites, and the video version will also be available on the Origins Project YouTube.
 

Get full access to Critical Mass at lawrencekrauss.substack.com/subscribe

What's New in Science | Cosmic Surprises, Newton Supreme, A New Collider, and Feynman Dines Out?

Alvin Roth is a Nobel Prizewinning Economist whose work on designing markets has had real world impacts that may have saved thousands of lives around the world, while arousing strong emotions both for and against the programs he has helped put in place. Clearly not one to shy away from controversy, he represents the best of what The Origins Project is trying to promote: applying science and reason to public policy. In short, connecting science and culture!

Roth’s new book, which is fantastic, and comes out the same day this podcast is released deals with issues that often raise the public’s ire, from legalizing prostitution, to assisted suicide, and finally to a rational market for kidney transplants. For example, everywhere there is good date, legalizing prostitution reduces not only incidents of sexually transmitted disease, but also violent sexual assaults. It may also combat illegal human trafficking. As far as kidney transplants are concerned, in the US alone, over 130,000 kidney failures occur each year, and only 20,000-30,000 transplants are performed, because of a lack of suitable kidney donors. Roth has already helped resolve one bottleneck, connecting donors with those in need, through a kidney exchange, which is actually more complicated than it may seem due to medical incompatibilities even within closely related individuals. More generally, not only could lives be saved, but as he shows, it would save considerable money if a rational system of reimbursing prospective donors could be devised. 

Beyond his remarkable work tying empirical testing to theoretical ideas, as a human being, Roth is a saint. I have direct knowledge of this. On the day this podcast was recorded, we had an amazing 3 hour dialogue… one of the best I have had. Only problem was, I forgot to press record! We lost it all. With patience and grace that I never expected, Roth agreed to re-record another podcast on the same day. A friend of mine told me was a mensch. But I never expected that. I am eternally grateful, and I hope you will thoroughly enjoy, and have your perspective of the world altered by my conversation with this remarkable gentleman and scholar. Enjoy!

As always, an ad-free video version of this podcast is also available to paid Critical Mass subscribers. Your subscriptions support the non-profit Origins Project Foundation, which produces the podcast. The audio version is available free on the Critical Mass site and on all podcast sites, and the video version will also be available on the Origins Project YouTube.
 

Get full access to Critical Mass at lawrencekrauss.substack.com/subscribe

Alvin Roth: Moral Economics, from Prostitution to Kidney Transplant Markets

I’m back with my friend and colleague Sabine Hossenfelder for another episode of “What’s New in Science”. Spending time with Sabine was a nice chance to step away from my physics lecture series for a bit. I know many of you have been enjoying the lectures, so don’t worry, they’ll be back soon.

In this episode, we covered an incredibly wide range of science topics. Sabine opened with reported claim that the CIA used quantum magnetometry to find the downed pilot in Iran. The report, in the NY Post, looked fishy. We explain why it is. Then I described a new discovery in the physics of material that may solve perhaps the biggest problem in AI now: heat generation in computers. Sabine talked about a new claimed Big Bang Theory that might have some relevance to quantum gravity. Then I countered with a discussion of yet a new result that suggests the standard model of cosmology may have troubles, or that observers are wrong. 

After that, Sabine introduced a paper describing a possible new way to measure gravitational waves. I think it is a fine piece of work, though it is not clear if it is practical. If it were, then the huge interferometers that are now being used could be replaced by ‘tabletop’ detectors. We will see. 

Finally, I described an amazingly interesting news story that might have implications for the future of medicine. It also demonstrates what one person, with determination and wealth, can do to possibly cure their own maladies. Sid Sijbrandij, a billionaire tech CEO of Gitlab, was diagnosed with inoperable spine cancer, and launched an amazing program of diagnostics, AI data mining, and a group of scientists who developed vaccines specific to his genetic makeup. After implementing all the procedures, he has been cancer free for a year. While this is beyond the reach of people without these resources now, Sid’s story demonstrates the potential power of combining AI and genetic medicine in the future.

As always, an ad-free video version of this podcast is also available to paid Critical Mass subscribers. Your subscriptions support the non-profit Origins Project Foundation, which produces the podcast. The audio version is available free on the Critical Mass site and on all podcast sites, and the video version will also be available on the Origins Project YouTube.
 

Get full access to Critical Mass at lawrencekrauss.substack.com/subscribe

What's New in Science With Sabine and Lawrence | Ghost Murmers, New Wires, Cosmic Questions, And AI cures?

We usually begin the study of physics with a discussion of motion, not because it is easy, or because the modern understanding of motion began with Galileo hundreds of years ago. Rather, Galileo’s groundbreaking work provides a paradigm to understand how physics is done today. Extracting out the fundamental essence of motion from all the distractions associated with what turn out to be irrelevant complexities was a monumental intellectual leap for humankind—a leap we often take for granted. 

Without the leap, for example, Newton could never have made his profound discoveries about the relationship between force and movement, nor his discovery of the Universal Law of Gravitation. 

But too often we treat these remarkable achievements as something belonging in antiquity.. as if we have moved far beyond them in every way. Nothing could be further from the truth. Applying the very same ideas that Galileo and Newton developed leads us to the cusp of modern physics: the discovery of the dominant mass in the Universe, a vast invisible sea of dark matter. In this episode, we travel over 450 years of physics, from Galileo, to the threshold of our understanding of the cosmos today. Hang onto your hats. 

I’m also pleased to share a quick PSA. A reminder of our 2026 Origins expedition through the Greek archipelago (July 24 to 31), with a Cyprus add-on (July 17 to 22). If you’re interested, it’s worth raising your hand early. These trips tend to fill quickly. Express interest at 

https://originsproject.org/greek-adventure-2026-application/

As always, an ad-free video version of this podcast is also available to paid Critical Mass subscribers. Your subscriptions support the non-profit Origins Project Foundation, which produces the podcast. The audio version is available free on the Critical Mass site and on all podcast sites, and the video version will also be available on the Origins Project YouTube.
 

Get full access to Critical Mass at lawrencekrauss.substack.com/subscribe

Physics for Everyone, Lecture 3: Motion, from Galileo to Dark Mysteries

Alcoholism is a scourge on modern society. Every year, 178,000 American die from alcohol abuse, and it has been estimated that over 200 billion dollars is lost from the US economy due to alcoholism, includingcosts of health care, lost productivity, and costs of crime enforcement. Given this immense social cost, it is equally amazing that there is no widely accepted cure. Rather, alcoholics are told they need to abstain from taking a single drink for the rest of their lives, or they are likely to revert to their earlier states of alcohol abuse. 

Katie Herzog is a journalist whose work I have enjoyed and I was happy to have a conversation with her in general. But even more so after the publication of her recent book, Drink your Way Sober. She discusses there a fascinating science-based approach that appears to provide a ‘cure’ for many alcoholics that actually allows them to drink, if they wish, in moderation, for the rest of their lives. The idea is to use an opioid blocker, in this case something called naltrexone, that basically removes the pleasure response from drinking. A naltrexone pill can be taken a few hours before drinking, and over time, with the correct behavioral management, it has been shown to be effective for many drinking in removing the craving for alcohol.

What makes Katie’s book, and our discussion, so poignant is that Katie is not just a journalist writing about alcoholism, she was an alcoholic for most of her life, and her discovery of the work of of the so-called Sinclair Method, after the scientist David Sinclair, whose original work on naltrexone in Finland changed the field, changed her life. 

Her book intersperses her own experiences with the science underlying this new treatment for alcoholism, and it is thus perfect for our podcast, which connects science and culture. It also makes for a fascinating and informative conversation that I hope will help have a positive impact on treating this international blight. I hope you find it engrossing and as enjoyable to listen to as it was to produce.

And there are still berths available on our Greece and Cyprus adventure. Go to originsproject.org and explore the possibilities!

As always, an ad-free video version of this podcast is also available to paid Critical Mass subscribers. Your subscriptions support the non-profit Origins Project Foundation, which produces the podcast. The audio version is available free on the Critical Mass site and on all podcast sites, and the video version will also be available on the Origins Project YouTube.
 

Get full access to Critical Mass at lawrencekrauss.substack.com/subscribe

Katie Herzog: The Science Behind Drinking To Get Sober

I’m back with my friend and colleague Sabine Hossenfelder for another episode of “What’s New in Science”. I think this is one of my favorite dialogues that we have had. Spending time with Sabine was a nice chance to step away from my physics lecture series for a bit. I know many of you have been enjoying the lectures, so don’t worry, they’ll be back soon.

 In this episode, we covered the kind of science news I like best: ideas you can argue about and results that make you recalibrate. Sabine opened with describing a clever proposal that future fusion reactors might double as axion dark matter factories, producing a flux of very light, weakly interacting particles through neutron-lithium reactions in the shielding. That led to a discussion about what people mean by “axions,” why particle physicists tend to be more particular about the term, and why I’m always more interested in dark matter candidates that were invented to solve an actual problem, not just to fill a cosmological gap. From there we jumped to quantum mechanics at the edge of common sense, with a Vienna experiment showing interference from a cluster of thousands of atoms, and a friendly disagreement about whether “collapse” is a real physical process or just the wrong way to talk about what quantum mechanics is doing.

We also talked about AI and math, including the recent swirl of claims about machines proving famous open problems, what was hype, what was rediscovery, and what might genuinely be changing in how mathematicians search the landscape. Then we went from equations to extinction, with a fascinating new approach using space dust and helium isotopes to argue that life may have started rebounding after the Chicxulub impact far faster than people had assumed. Sabine brought a surprising example of string theory mathematics finding a practical use in modeling biological networks, and we ended with biology proper in two very different moods: a sobering study in mice suggesting lung tumors can hijack vagus nerve signaling to suppress local immune responses, and then a lighter result about dogs learning words from overheard human conversation at roughly toddler level. My dog Levi, who many of you have seen on the podcast, was asleep next to me while we talked about it, which felt like the right way to end.

As always, thank you for your continued support, and I hope the changing of seasons brings you good time with friends and family.

As always, an ad-free video version of this podcast is also available to paid Critical Mass subscribers. Your subscriptions support the non-profit Origins Project Foundation, which produces the podcast. The audio version is available free on the Critical Mass site and on all podcast sites, and the video version will also be available on the Origins Project YouTube.
 

Get full access to Critical Mass at lawrencekrauss.substack.com/subscribe

What's New in Science With Sabine and Lawrence | Fusion Dark Matter, String Theory in Biology, and Rapid Evolution

Any sufficiently advanced technology is indistinguishable from magic, as Arthur C. Clarke put it. In that spirit, the way we get closest to “magic” in physics is not by memorizing more facts or equations, but by learning a few mental tools that help us see through the illusion of complexity by extracting the wheat from the chaff. They are all simple at heart, but nevertheless quite powerful, and they form the core of what I call the Gestalt of Physics—the worldview that governs how physicists approach nature. And some of them can actually seem like magic to the uninitiated! 

I’m also pleased to share a quick PSA. We’re organizing our next Origins travel adventure: a sailing expedition through the Greek archipelago (July 24 to 31) with a possible Cyprus add-on (July 18 to 23). If you’re interested, it’s worth raising your hand early. These trips tend to fill quickly. Express interest at http://originsproject.org/greece-2026

In Lecture 1, I used powers of ten as an intellectual zoom lens, a way to escape the trap of human scale. Lecture 2 steps back and asks a more fundamental question: how do physicists consistently make progress when the world looks hopelessly complicated?

This lecture focuses on the fundamental toolkit for seeing. We will use these tools throughout the series, because they are the difference between being dazzled by nature and being able to interrogate it, and ultimately understand it.

First, order of magnitude thinking, the art of using powers of ten and rough estimates. It is how you keep your intuition tethered to reality, and how you avoid being bullied by big numbers dressed up with false precision.

Second, approximation, which is where I introduce my super cow. It is not only a spherical cow. It’s better. My super cow has exactly the features we need for the question at hand, no more, no less, and it politely agrees to ignore everything irrelevant. I introduce it with a joke, but it is also the core of how we turn messy reality into something we can actually calculate without lying to ourselves.

Third, dimensional analysis, one of the great bargains in science. The fact that there are essentially only 3 fundamental ‘dimensional’ quantities describing nature—Length, Time, and Mass—means that all physical quantities can be related to other physical quantities through a small set of relations. Keeping track of dimensions allows us to often guess what the relations are, without knowing any details of specific physical situations. It seems like magic. By keeping track of the dimensions underlying quantities, you can often infer the form of an answer and you can catch nonsense instantly. Sometimes the most important result is realizing something cannot be right, because that is where new physics likes to hide.

Along the way I adopt some Fermi style challenges—named after the remarkable physicist Enrico Fermi—to show how these ideas work in real time, and why they are not parlor tricks. They provide a training in scientific judgment. I also end with a preview of what comes next, symmetry, a concept that quietly runs far more of the universe than most people realize.

Enjoy, and feel free to share.

Lawrence

As always, an ad-free video version of this podcast is also available to paid Critical Mass subscribers. Your subscriptions support the non-profit Origins Project Foundation, which produces the podcast. The audio version is available free on the Critical Mass site and on all podcast sites, and the video version will also be available on the Origins Project YouTube.
 

Get full access to Critical Mass at lawrencekrauss.substack.com/subscribe

Physics for Everyone, Lecture 2: The Gestalt of Physics, Tools for Seeing

In this episode, Lawrence sits down with planetary scientist Alan Stern to discuss his new book Chasing New Horizons, which chronicles his work as head of NASA’s New Horizons mission to Pluto and beyond. Stern describes the trials and tribulations of a decades-long space mission, and he and Lawrence debate the future of manned space exploration, and much more.
 
See the exclusive, full HD videos of all episodes at www.patreon.com/originspodcast immediately upon their release.
 

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Get full access to Critical Mass at lawrencekrauss.substack.com/subscribe

Alan Stern

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