The Rest Is Science Alan Turing’s Final Theory Was About Leopards
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Apr 27, 2026 The podcast explores how simple chemical rules can turn a uniform cell ball into heads, tails, stripes and spots. It traces Alan Turing's reaction–diffusion idea through classic simulations and modern biological evidence. The conversation also extends the math to cities and crime maps, and wrestles with the ethical risks of using predictive models in society.
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Turing Reaction Diffusion Explains Biological Patterns
- Alan Turing showed that two interacting chemicals with different diffusion rates can turn uniform noise into stable patterns.
- A slow activator that self-amplifies plus a fast inhibitor that spreads widely creates spots, stripes, or no pattern depending on geometry.
Turing's Persecution and Tragic End
- Hannah recounts Alan Turing's 1952 conviction for homosexual activity and enforced chemical castration with synthetic estrogen.
- Turing's forced hormonal treatment changed his body and mind and preceded his 1954 death by cyanide-laced apple.
WNT and DKK Validate Turing Patterns In Skin
- Modern biology has identified molecular activator/inhibitor pairs like WNT and DKK that implement Turing patterns in skin and hair follicle spacing.
- Experimental tweaks to DKK in mice produced larger merged hair clusters or baldness exactly as the math predicted.