Physics is not enough to understand life and mind because understanding requires generative capabilities — if you want to solve real problems like regrowing limbs or repairing psychological damage, you need tools beyond physics, just as a mathematical proof cannot be understood by describing the air particles that carried the sound waves.

Levin argues that physics alone cannot provide a complete understanding of life and mind, because understanding requires generative, practical capabilities. He illustrates with the example of a mathematical proof: a physicist can describe the air particles moving from speaker to ear, but that description misses the actual content of the proof. ✦ AI generated

Michael Levin · Lex Fridman · 2025-11-30 · original ↗

Here's the issue. Everything here hangs on what it means to understand, okay? For me, because understand doesn't just mean have some sort of pleasing model that seems to capture some important aspect of what's going on. It also means that you have to be generative and creative in terms of capabilities. And so for me, that means if I tell you this is what I think about cognition in cells and tissues, it means, for example, that I think we're going to be able to take those ideas and use them to produce new regenerative medicine that actually helps people in various ways, right? It's just an example. So if you think as a physicist, you're going to have a complete understanding of what's going on from that perspective of fields and particles and who knows what else is at the bottom there, what does that mean then, that when somebody is missing a finger or has a psychological problem or has these other high-level issues, that you have something for them, that you're going to be able to do something? Because my claim is that you're not going to. And even if you have some theory of physics that is completely compatible with everything that's going on, it's not enough. That's not specific enough to enable you to solve the problems you need to solve. In the end, when you need to solve those problems, the person you're going to go to is not a physicist. It's going to be either a biologist or a psychiatrist or who knows, but it's not going to be a physicist. And the simple example is this. let's say someone comes in here and tells you a beautiful mathematical proof. Okay, it's just really, you know, deep and beautiful. And there's a physicist nearby and he says, well, I know exactly what happened. There were some air particles that moved from that guy's mouth to your ear. I see what goes on. It moved the cilia in your ear and the electrical signals went up to your brain. I mean, we have a complete accounting of what happened, done and done. But if you want to understand what's the more important aspect of that interaction, it's not going to be found in the physics department, it's going to be found in the math department. So that's my only claim is that physics is an amazing lens with which to view the world, but you're capturing certain things.

verbatim transcript · starts at 18:37