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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

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

New Year’s Eve always comes with that familiar urge to clean the slate, toss out what didn’t hold up, and keep what actually earned its place. That’s basically the spirit of our latest “What’s New in Science” episode with Sabine Hossenfelder.

We began with the season’s favorite shiny object: wormholes. The headlines have been everywhere, but we talked through why most of these stories quietly slide from “a speculative tool in a model” to “a virtual phenomenon that might be useful in calculations.” Traversable wormholes of course still run straight into hard constraints like negative energy and the time machine problem.

From there we moved to something much more grounded: CERN. ATLAS has now observed the Higgs decaying into muon pairs, which is exactly the kind of precise confirmation you want for the Standard Model, and while it is yet another remarkable confirmation of how well the fundamental feature of the Standard Model works, it once again sharpens the contrast with the inexplicable nature of the only feature that doesn’t seem to fit: neutrino masses. And it leaves us hanging about where to look next.

We next spent time on what the future might look like for big particle collider projects and what it says about the field’s priorities, including the signal sent by China’s latest five-year plan, which no longer features a massive circular collider proposal. We touched on a smaller CERN result as well, and used it to reflect on a broader point: some of the most stubborn, interesting physics lives in regimes that are messy rather than glamorous.

Then we took a quick detour into a quantum gravity-adjacent proposal about whether the way we average quantities in general relativity could matter for quantum corrections, and finally landed on a genuinely satisfying closer: OSIRIS-REx’s Bennu samples. Finding ribose alongside other prebiotic building blocks makes it harder to dismiss the idea that the chemistry of life might be widespread, and not a once-only cosmic fluke.

I hope you enjoy the episode, and I hope you’re welcoming the new year surrounded by friends and family. Thank you, as always, for listening and for your continued support.

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| New Year's Edition: Big ideas, precision measurements, and prebiotic molecules.

On this week’s episode of The Origins Podcast, I ended up in a place I genuinely never expected to go: the humble “like” button. When the idea first landed in my inbox, my reaction was basically, why on Earth would anyone write a whole book about that? Then I spoke with Martin Reeves, and I discovered that the history of this tiny icon is a surprisingly rich window into innovation, entrepreneurship, human psychology, and the modern attention economy.

Martin is a senior figure at BCG’s Henderson Institute, but what made the conversation especially fun for me is that he is not a consultant who wandered into science. He has a background in science, and then wandered into the world of strategy, technology, and ideas, and he approaches the “like” button the way I wish more people approached our digital world: with curiosity, skepticism, and a willingness to follow evidence across disciplines.

The central irony, of course, is that the “like” button began as an almost laughably small, practical solution. In the story Martin and his coauthor reconstructs, it is often less about a single inventor than about a messy ecosystem of micro innovations, technical constraints, and cultural accidents. Yet those small choices compound. The result is that something as simple as a handful of code became a universal signal that helped shape social media, transformed advertising, and created feedback loops that are now baked into the infrastructure of daily life.

We also dig into why it works so well on us. The mechanisms are not mysterious in the abstract, they are biological and social, but the scale is unprecedented. Approval and recognition are ancient. Industrialized approval is new. And once you start thinking that way, you notice how these same feedback dynamics are spreading into new domains, including the tools we now use to interact with AI.

This conversation surprised me, and I suspect it will surprise you too. Indeed, if you are like me, and wondered why the like-button is worth discussing, you will be surprised to learn how much of the modern world is quietly organized around it. 

You can listen on any podcast platform, watch on YouTube, or view ad free on Substack. And if you are tempted at the end, well, you may even find yourself clicking the very thing we spend the episode dissecting.

You can listen on any podcast platform, watch on YouTube, or view ad free on Substack. And if you are tempted at the end, well, you may even find yourself clicking the very thing we spend the episode dissecting.

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

The Like Button, and the Strange Power of Tiny Ideas | Martin Reeves

On this week’s episode of The Origins Podcast, I am excited to release a conversation that has been sitting in our archives for more than a year. When we first recorded this discussion with conflict mediator and systems thinker Diana McLain Smith, political polarization was already a significant national and international problem. It has only gotten worse.The world seems more tribal than ever, and there is constant pressure to have to pick a side in every argument and not listen to any different opinions, or even divergent facts. In this episode, we step back from that noise and ask what our deep evolutionary wiring for in group loyalty means in a complex modern democracy, how history and culture can turn ordinary differences into hardened divides, and what it might take to reduce the space between “us” and “them” rather than accept permanent hostility as normal.Through stories that range from local communities like Billings, Montana and Lewiston, Maine to the quiet work of reform in the United States Congress, Diana draws on decades of experience with families, organizations, and civic coalitions to show that citizens are not as powerless as we often feel, especially when we resist the demand for instant certainty and allow ourselves to say, “I do not know, I have not really thought about that before. I’m not on any one side. Let me look at the evidence before I form an opinion.”

This is the basis of much of the scientific method, and it is something that we can all learn to do too. The benefits are immediate. You approach life with more curiosity, and you are freer from assumptions and biases.

Conversations like this go to the heart of the Origins Project Foundation mission, which is to bring the habits of mind that underlie science into our shared public life. My conversations on the podcast blend serious works in physics, psychology, and history with urgent questions about how we live together, and to model what it looks like to treat ideas as hypotheses to be tested rather than badges of tribal identity.

In an environment that rewards outrage more than understanding, a commitment to evidence, curiosity, and a willingness to change one’s mind is not just an intellectual posture, it is a civic act.

This episode with Diana is offered in that spirit.

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

Polarization, Powerlessness, and what We can Actually Do

I am thrilled to introduce a significant new segment for the Origins Podcast. We are producing a fully fledged 12-part series titled “A Dozen Lessons on Physics and Reality.” Over the coming months, we will release these lectures to provide a comprehensive guide to how physicists think about the world. I’m particularly excited to share the wonder and insights that are often lost in standard textbook descriptions, while giving more detail than one might obtain in a standard 1 hour physics lecture. These will be based on lectures I have given to non-scientists at institutions I have taught, ranging from Yale University to The New College of Humanities in London.

We begin with Lecture 1: A Tour of the Universe.

To understand the cosmos, we must abandon the linear scales of human experience. In this opening lecture, I utilize the mathematical tool of “powers of ten” to map the true playing field of physics. This tour is about perspective. It reveals how the universe operates on scales of space and time that are vastly different from our daily lives, ranging from the subatomic scales to the cosmic microwave background. It is a journey that highlights our cosmic insignificance while simultaneously celebrating the power of science to explore our origins and to change our perspective of our place in the cosmos. This tour is just the beginning. Here is the full curriculum we have planned for the series:

* A tour of the Universe

* The Gestalt of Physics: Tools for seeing

* Space, Scale, and Symmetry

* Motion, from Galileo to Einstein

* Gravity, Dark Matter, and the Expanding Universe

* Electricity and Magnetism, a repeat performance

* The Four Forces of Nature

* Quantum Mechanics 1

* Quantum Mechanics 2: Chemistry

* Quantum Mechanics in your face

* Heat worth dying for?

* The meaning of scientific truth

This initiative ties directly into our ongoing efforts at The Origins Project Foundation to expand our impact and achieve our mission of enhancing your excitement and appreciation of the wonders of the cosmos, providing the public tools to better understand the challenges of the 21st century, and how to deal with them. By making these fundamental ideas accessible, we hope to inspire a deeper appreciation for the scientific method and its importance in creating the world we live in, and producing a better world tomorrow.

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

Announcing our new 12-part series: A dozen Lessons on Physics and Reality

This week, I’m excited to share a special rebroadcast from the Origins Podcast archives: my original Origins Podcast conversation with Noam Chomsky.

We recorded this dialog over six years ago, as an update to a conversation we’d held three years prior , before the political upheavals of Trump and Brexit.

Listening back now, it’s striking how much of what Noam said remains relevant, and in many cases, deeply prescient. As always, he was incisive, informative, provocative, and brilliant. We covered a huge range of topics, starting with the history of anti-intellectualism in America and the role of intellectuals during the Vietnam War , before moving into the nature of American exceptionalism.

We also dove into the pressing foreign policy issues of the day, including North Korea, Syria, Israel, Venezuela, and Brazil. While many of the underlying causes may be the same, it’s fascinating to see how some of these situations have played out in ways we might never have predicted.

From his analysis of free speech debates to his critical concerns about nuclear weapons and the environment, it’s a conversation that remains incredibly important.

I hope you enjoy revisiting this fascinating conversation.

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

(Rebroadcast) Noam Chomsky | Prescient Predictions? | Trump, Brazil, and American Fear

As we move into the end of the year, I’m excited to return to our recurring series “What’s New in Science” with my co-host Sabine Hossenfelder. In this month’s episode, we started by tackling a favorite subject: scientific hype. Sabine kicked things off by dissecting a recent, highly suspect press release claiming a million-qubit quantum computer is on the horizon. I then brought up a National Geographic article claiming that “warp drive is speeding closer to reality” , and we discussed the reasons why it actually isn’t, including the need for “negative energy,” that keep it firmly in the realm of science fiction.

From there, Sabine steered us into the world of academic accolades, discussing the controversy around last year’s Nobel Prize in Physics for work on neural networks and the collaborative nature of science. I then introduced this year’s prize, which was awarded for the beautiful and precise experimental work on seemingly macroscopic manifestations of quantum mechanics—specifically, showing a superconducting quantum state can “tunnel” through a barrier.

Finally, we turned to cosmic mysteries. Sabine presented a report on search for “Dark Stars,” a theory that the first stars might have been powered by dark matter annihilation , which require some wishful thinking and what I think are not particularly well motivated physics. For full disclosure this is an issue I thought about in a slightly different context almost 40 years ago and have some a priori skepticism about. I closed with a much more plausible bit of exotic physics that may have been observed: new observations of long-lived gamma-ray bursts. A new model suggests these are caused by a black hole that has merged with a star and is consuming it from the inside out. 

From wild hype to implausible and plausible models to Nobel-winning physics, I hope you enjoy the conversation.

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

In a special Halloween episode of the Origins Podcast, which I’ve have decided to call “Spooky Physics!”, I explore why you shouldn’t be afraid of the unknown, and in particular of supernatural gobbledygook. We look at the fundamental physics that debunks popular supernatural ideas.

Take ghosts, for example. Physics is a two way street. If you can see a ghost, it must interact with light. But that very interaction, electromagnetism, is what stops you from walking through a wall. A ghost simply can’t have its cake and eat it too; it either goes through walls or you can see it. Not both.

I also confront one of the biggest misuses of physics today: the co-opting of quantum mechanics. People seize on Einstein’s “spooky action at a distance” to argue that consciousness can change the universe just by thinking. This is complete nonsense. I explain what entanglement really is and why it does not allow you to affect things remotely, no matter how much you might want to.

The moral of today’s topic is simple: don’t be afraid. And more importantly:

The real universe, with its actual quantum wonders and black holes, is far more interesting than any supernatural fantasy. 

Enjoy Halloween…especially the candy.

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

Spooky Physics!

As The War on Science continues to circulate and reach readers around the world, I had the privilege of closing our Origins mini series, The War on Science Interviews, with my colleague and book contributor Gad Saad. It felt fitting to end the series with a candid and provocative conversation that reflects the spirit of the project itself.

The essays and interviews collected around this book address a wide range of concerns: the ideological corruption of science, the erosion of free speech in academia, the replacement of scholarship with activism in many disciplines, and the disruptions now spreading from mathematics to medicine. We explore how cancel culture and DEI bureaucracies weaken excellence, how biology is distorted for political ends, and how false premises about gender and sex compromise both science and medicine. The conversations are blunt and challenging, but they also aim to outline principles that can help universities recover integrity, trust, and the courage to return to embracing free inquiry.

Gad and I discussed many of these themes directly. He confronts the absurdities of modern campus culture, and his voice joins those the other contributors who have argued that ignoring these trends will not make them disappear. Many academics have hoped the problems would fade on their own. They have not. The internal culture war in academia must be confronted openly if scholarship and science are to thrive in the West.

I am hopeful the book will spark debate in universities and among the wider public. If you would like the full context for this episode, you can watch the complete War on Science Interviews mini series at this link here. In the meantime enjoy this episode now.

With this finale, Origins now returns to its regular biweekly release schedule. We have some fascinating new conversations, educational content, and science news in store that I am excited to share.

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

Gad Saad: Final Episode of The War on Science Interviews

Lawrence joins Shakespearean, historian, and Pulitzer Prize winning author Stephen Greenblatt to discuss renaissance thinking, the crossroads of science and literature, Adam and Eve, Trump and much more.
 
See the commercial-free, full HD videos of all episodes at www.patreon.com/originspodcast immediately upon their release.
 
Twitter: @TheOriginsPod
 Instagram: @TheOriginsPod
 Facebook: @TheOriginsPod
 Website: https://theoriginspodcast.com
 

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

Stephen Greenblatt

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