Ryan Collison

Organisms die when they encounter states they can't survive. That's not just biology — it's a thermodynamic constraint. The Free Energy Principle formalizes it: living systems must minimize surprise or cease to exist. Everything a brain does — perceiving, moving, planning — is surprise minimization.

Every living thing, from a bacterium to a philosopher, is doing one thing: resisting surprise. Karl Friston's Free Energy Principle formalizes that insight into a single mathematical framework — and this is the clearest entry point we've found.

Classical physics describes trajectories — what will happen given initial conditions. Constructor theory asks what transformations can be reliably performed, and what makes something a constructor. Deutsch and Marletto argue this reframing captures truths standard physical laws simply cannot.

Two probability distributions can be close or far apart — and information geometry measures that distance rigorously. The space of beliefs is curved, and the Fisher metric defines its shape. Why some beliefs update easily, why others resist evidence, why sensitivity varies: the geometry explains it.

Embodied, embedded, enacted, extended — 4E cognition transformed how we think about where minds live. But the framework has a gap: it doesn't explain when thinking succeeds or breaks down. Adding a stability dimension changes what the theory predicts.

Your nervous system isn't a single system — it's three evolutionary layers stacked together. Freeze is oldest, fight-or-flight came next, social engagement is newest. Polyvagal theory maps how these layers interact, why trauma hijacks older circuits, and what it takes for a body to feel safe.