Cool Worlds Podcast

#29 Nick Bostrom - Simulation Theory, Anthropic Reasoning, Great Filters

Jan 28, 2026
Nick Bostrom, Oxford philosophy professor known for work on anthropic reasoning and the simulation argument, joins to explore weird questions about our place in the cosmos. He unpacks anthropic reasoning and sampling puzzles. He lays out the simulation trilemma and discusses existential risks, AI alignment, and the Fermi paradox in concise, thought-provoking ways.
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INSIGHT

SSA Versus SIA: Two Different Self-Views

  • SSA treats you as a randomly selected observer from a reference class of actual observers.
  • SIA instead boosts hypotheses that predict more observers by updating on the mere fact of your existence.
INSIGHT

Doomsday Argument As Urn Analogy

  • The Doomsday Argument updates on your birth rank to favor hypotheses with fewer total observers.
  • It parallels drawing a low-numbered ball from an urn and revising the probability the urn is small.
INSIGHT

SIA Cancels Doomsday But Creates Problems

  • Rejecting Doomsday simply because its conclusion is unpalatable is epistemically weak.
  • SIA was introduced partly to cancel Doomsday's shift, but it brings problematic implications of its own.
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