The guest
Sara Imari Walker: Theoretical physicist and astrobiologist studying the origin of life; creator of assembly theory and author of 'Life As No One Knows It'.
What this episode covers
Sara Imari Walker joins Joe Rogan to explain assembly theory, a framework arguing the universe cannot generate complex objects without life. They explore the unknown origin of life on Earth, the vastness of chemical and possibility space, and efforts with chemist Lee Cronin to build artificial alien life in the lab. The conversation ranges across octopus and dolphin intelligence, plant cognition, transhumanism, mechanical watches, ancient Egyptian mysteries, and the nature of time. Walker also defends free will, rejects simulation theory and infinity as physical realities, and argues humans are among the most interesting things in the known universe.
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The guest's own work
BookBy the guestISBN verified
Life As No One Knows It: The Physics of Life's Emergence
Sara Imari Walker
“I have a book out it actually is out today called life is no one knows it the physics of life's emergence where I talk about assembly Theory”— Sara Imari Walker
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Big reveals from this episode
- Assembly theory claims high-complexity, high-abundance objects can only be made by living processes.
- Walker's team experimentally verified a molecular complexity boundary above which a molecule must be derived from life.
- There is no scientific consensus and no real evidence for how life originated or whether it exists elsewhere.
- Lee Cronin's company Chemify aims to digitize chemistry and 3D-print any molecule, with the real goal of creating artificial life.
- Walker believes first contact with alien life will come from evolving alien biology in the lab, not from space.
- Walker changed from a determinist to a presentist in recent years, grounded in assembly theory's view of time.
- Walker rejects infinity as a real physical thing, calling it a placeholder for the boundary of imagination.
Worth remembering
- Every permutation of the taxol molecule's structure would fill 1.5 universes in volume from one molecular formula.
- Dolphins and orcas have a cerebral cortex about 40% larger than humans' and use different dialects.
- 'Avatar Depression' was a real phenomenon where viewers became depressed they couldn't live like the Na'vi.
- The oldest identifiable life traces date to about 3.8 billion years ago.
- The world's first mechanical clock was a water-driven device invented by Buddhist monk Yi Xing in 725 AD.
- Grand Seiko Spring Drive watches are accurate to within half a second a day with a 72-hour power reserve.
- A Rolex watch's power reserve helped police estimate a murder victim's time of death in 1996.
- A 2024 study proposed ancient Egyptians may have used a hydraulic system to build the step pyramid.
- Physicist Nicolas Gisin argues real numbers aren't physically real because they require infinite precision.
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