The Fabric of Reality

David Deutsch weaves together four fundamental strands—quantum physics (many-universes interpretation), evolution (Darwin/Dawkins), computation (quantum computing), and knowledge (Karl Popper)—arguing these are so intertwined that we cannot properly understand any without the others. The book demonstrates that quantum theory, taken literally, implies countless parallel universes, explaining quantum computers as working by collaborating with counterparts in other universes through a simple light-passing-through-slits experiment. Deutsch connects quantum mechanics to topics including time travel physics, nature's comprehensibility, virtual reality limits, human life significance, and the universe's ultimate fate.

9 sections · 24 lessons

Course outline

Foundational Framework

  1. Four Strands
  2. Multiverse Unifies
  3. Foundational Framework

Multiverse Evidence

  1. Shadow Photons
  2. Observer-Relative Tangibility
  3. Multiverse Evidence

Quantum Phenomena

  1. Double-Slit Mystery
  2. Quantum Computers
  3. Quantum Phenomena

Philosophical Foundations

  1. Realism
  2. Reality Criteria
  3. Philosophical Foundations

Knowledge Creation

  1. Anti-Inductivism
  2. Conjecture Criticism
  3. Hard-to-Vary
  4. Knowledge Creation

Computation Theory

  1. Universal Computation
  2. CTD Principle
  3. Virtual Reality
  4. Computational Limits
  5. Computation Theory

Evolution Framework

  1. Evolution Multiverse
  2. Human Significance
  3. Evolution Framework

Deep Structure

  1. Quantum Time
  2. Time Travel
  3. Mathematics Physical
  4. Comprehensibility
  5. Deep Structure

Ultimate Implications

  1. Omega Point
  2. Infinite Knowledge
  3. Four-Strand Synthesis
  4. Ultimate Implications

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