
ToKCast Ep 256: David Deutsch’s ”The Fabric of Reality” Chapter 13 ”The Four Strands” Part 2
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Jan 30, 2026 They compare Popper and Kuhn on how theories change and whether social forces or rational criticism drove quantum theory's rise. They contrast Copenhagen’s appeal to consciousness with Everett’s universal formulation and explore why the multiverse idea was ignored then later embraced. They link quantum computation and cosmology to the need for deeper explanations and discuss how Popperian criticism shapes scientific practice.
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Science Runs On Criticism Not Consensus
- Popper: social environment may influence scientists but does not determine a theory's logical status.
- Scientific objectivity is achieved by an institution of mutual criticism, not individual impartiality.
Everett Eliminates Special-Cause Observation
- The Copenhagen interpretation invoked consciousness to explain measurement and avoided multivariant reality.
- Everett's relative-state (many-worlds) treats observations as ordinary interactions governed by universal laws.
Wheeler Promoted Everett's Paper
- John Archibald Wheeler wrote a clarifying, supportive paper that accompanied Everett's and made many assume joint authorship.
- The idea was widely discussed as the Everett–Wheeler theory despite Wheeler personally rejecting it.







