The Universal Hierarchy of Life - Prof. Chris Kempes [SFI]

"What is life?" - asks Chris Kempes, a professor at the Santa Fe Institute. Chris explains that scientists are moving beyond a purely Earth-based, biological view and are searching for a universal theory of life that could apply to anything, anywhere in the universe. He proposes that things we don't normally consider "alive"—like human culture, language, or even artificial intelligence; could be seen as life forms existing on different "substrates". To understand this, Chris presents a fascinating three-level framework: - Materials: The physical stuff life is made of. He argues this could be incredibly diverse across the universe, and we shouldn't expect alien life to share our biochemistry. - Constraints: The universal laws of physics (like gravity or diffusion) that all life must obey, regardless of what it's made of. This is where different life forms start to look more similar. - Principles: At the highest level are abstract principles like evolution and learning. Chris suggests these computational or "optimization" rules are what truly define a living system. A key idea is "convergence" – using the example of the eye. It's such a complex organ that you'd think it evolved only once. However, eyes evolved many separate times across different species. This is because the physics of light provides a clear "target", and evolution found similar solutions to the problem of seeing, even with different starting materials. **SPONSOR MESSAGES** — Prolific - Quality data. From real people. For faster breakthroughs. — Check out NotebookLM from Google here - - it’s really good for doing research directly from authoritative source material, minimising hallucinations. — cyber•Fund is a founder-led investment firm accelerating the cybernetic economy Hiring a SF VC Principal: Submit investment deck: — Prof. Chris Kempes: TRANSCRIPT: TOC: 00:00:00 - Introduction to Chris Kempes and the Santa Fe Institute 00:02:28 - The Three Cultures of Science 00:05:08 - What Makes a Good Scientific Theory? 00:06:50 - The Universal Theory of Life 00:09:40 - The Role of Material in Life 00:12:50 - A Hierarchy for Understanding Life 00:13:55 - How Life Diversifies and Converges 00:17:53 - Adaptive Processes and Defining Life 00:19:28 - Functionalism, Memes, and Phylogenies 00:22:58 - Convergence at Multiple Levels 00:25:45 - The Possibility of Simulating Life 00:28:16 - Intelligence, Parasitism, and Spectrums of Life 00:32:39 - Phase Changes in Evolution 00:36:16 - The Separation of Matter and Logic 00:37:21 - Assembly Theory and Quantifying Complexity REFS: Developing a predictive science of the biosphere requires the integration of scientific cultures [Kempes et al] Seeing with an extra sense (“Dangerous prediction”) [Rob Phillips] The Multiple Paths to Multiple Life [Christopher P. Kempes & David C. Krakauer] The Information Theory of Individuality [David Krakauer et al] Minds, Brains and Programs [Searle] The error threshold Assembly theory and its relationship with computational complexity [Kempes et al]

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The Universal Hierarchy of Life - Prof. Chris Kempes [SFI] is an episode from Machine Learning Street Talk by Machine Learning Street Talk (MLST).

This episode is 00:40:59 long.

This episode was published on Oct 25, 2025.

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