Conjecture Institute

People, Reason, & Reality Part I: Reason, Module 3: Explanations: Good, Bad, & Constrained

Mar 5, 2026
A walkthrough of what makes explanations reliable and why many familiar accounts fail. They contrast mythic and natural answers for earthquakes and unpack Deutsch’s hard-to-vary idea. The talk explores coherence between explanations and why true-sounding theories can still miss the point. It ends by outlining three constraints that narrow the space of acceptable explanations.
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ANECDOTE

Poseidon Story Shows Arbitrary Explanations Fail

  • Ancient cultures offered concrete stories to explain earthquakes like Poseidon's trident strikes.
  • Logan Shipkin contrasts the Greek divine tale with its arbitrary swaps (Zeus, different weapons, emotions) to show its emptiness.
ANECDOTE

Thales' Natural Tale Still Easy To Vary

  • Thales gave a naturalistic anecdote: the flat earth floating on an infinite ocean whose waves cause earthquakes.
  • Logan notes it improved on divine tales but remained easy to vary (milk, other fluids), so still weak.
INSIGHT

Interdependent Components Make Plate Tectonics Robust

  • Plate tectonics is a hard-to-vary explanation because its components (rocky plates, faults, friction, seismic waves) are interdependent.
  • Logan argues swapping or removing components (cheese plates, no faults) collapses the explanation's coherence.
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