Making Sense with Sam Harris - Subscriber Content

#414 - Strange Truths

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May 12, 2025
David Deutsch, a visiting professor of physics at Oxford, dives deep into the mind-bending world of quantum mechanics. He unpacks the many-worlds interpretation and the implications of constructor theory for future technologies. The conversation veers into the ethics of AI and the challenges of developing artificial general intelligence. Deutsch also tackles complex topics like the historical roots of antisemitism and the need for constructive discussions around Israel, revealing how science and societal issues are intricately connected.
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INSIGHT

Many-Worlds: Reality is Multiversal

  • The many-worlds theory posits that reality consists of many universes, all existing simultaneously, unlike interpretations relying on wave function collapse.
  • It removes the mystical role of observation and asserts that all possibilities according to physics actually occur across many universes.
INSIGHT

Quantum Events Spawn Multiple Universes

  • In many worlds, each quantum event causes the universe and observer to differentiate into multiple copies, each perceiving different outcomes.
  • We exist simultaneously in many universes, observing different possibilities downstream of quantum events.
INSIGHT

Probability as Rational Expectation

  • Probability in many worlds isn't frequency-based but a rational construct about what a rational agent expects given universes differentiate.
  • Probability emerges as useful fiction since everything allowed by physics happens somewhere in the multiverse.
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