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Speaker 1: Imagine a universe where, for your consciousness, death isn't really

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the final curtain.

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Speaker 2: Sounds like something ripped straight from a sci fi epic,

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doesn't it.

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Speaker 1: Oh, absolutely a wild fantasy maybe, or you know, a

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philosopher's fever dream.

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Speaker 2: But what if this isn't just wishful thinking? What if

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this mind bending concept, the idea of quantum immortality, isn't

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just fantasy but a radical, almost audacious implication of our

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most well rigorously tested scientific theories.

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Speaker 1: It's a concept that challenges the very core of what

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we understand about life, mortality, and even what it means

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to be you. We're not just dipping our toes into

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the theoretical here, We're stepping into the deep end, really

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into the realm of quantum immortality. It's a profound idea,

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and it emerges from the deepest, most mysterious corners of

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quantum mechanics, a place where our everyday intuition just completely

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fails us.

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Speaker 2: Absolutely. So, today we are taking a true deep dive

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into this strange, wonderful, and let's be honest, sometimes terrifying

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world of quantum theory, exploring.

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Speaker 1: How it leads to such an audacious claim about our

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very existence, the intense debates it ignites among scientists and philosophers,

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and maybe what these incredible ideas could truly mean for

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your personal experience of reality. You might need to forget

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everything you thought you knew about certainty and fate.

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Speaker 2: Our mission here is to unravel the what, the why,

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and crucially the so what of this extraordinary concept. We'll

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be navigating through some fascinating insights and discussions from leading

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thinkers in the field, trying to guide you through the

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well the intricate landscape of these incredible possibilities. Prepare for

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some serious brain bending.

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Speaker 1: Yeah, no kidding, And we've truly assembled a fascinating array

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of sources for this deep dive, from the foundational ideas

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of quantum pioneers like Einstein and Shortinger all the way

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to contemporary discussions that really push the boundaries of reality

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and identity. It's quite arranged, so get ready to have

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your common sense intuition thoroughly shaken. You might even find yourself,

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your own perception of self, and maybe the very fabric

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of existence by the time we're done. Okay, let's impact

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this together. Before we can even begin to talk about

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something as monumental as immortality. We have to grasp just

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how utterly bizarre, how profoundly different the quantum world is

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from anything we experience day to day. It's like discovering

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the fundamental building blocks of the universe aren't playing by

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any rules we thought we knew. Classical physics it gave

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us this predictable clockwork universe, right, But quantum mechanics, it

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fundamentally defies that classical determinism.

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Speaker 2: Einstein famously and with some exasperation, described it as God.

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Speaker 1: Playing dice, right exactly.

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Speaker 2: It tells us that the world at its smallest scales

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behaves in ways that are just fundamentally not intuitive, not solid,

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not certain. Yeah, precisely. And it's important to understand that

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this isn't just the theory about tiny particles. It's implications

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reached far beyond that, potentially stretching to the very nature

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of existence itself. Really sets the stage for how revolutionary

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quantum mechanics actually is. It's not just an extension of

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classical physics with some minor tweaks. It's a completely different

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rule book. Certainty gives way to probability, and our everyday

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intuition often leads us totally astray.

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Speaker 1: So when you zoom way in.

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Speaker 2: Yeah, when you zoom into the smallest scales, the universe

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stops acting like a perfectly calibrated mechanism and starts behaving

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like this, this nebulous collection of possibilities. It's a profound

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shift in perspective, and.

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Speaker 1: That the absolute core of this realm of possibility is

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a concept called superposition. If you want to truly understand

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the quantum world, you have to grapple with superpositions. Definitely,

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it's probably the most iconic and frankly mind bending idea

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in quantum mechanics. Particles, like say an isolated electron, they

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don't have definitive positions or velocities in the way a

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billiard ball does. They don't have a single fixed state. Instead,

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they are, as our sources describe, kind of everywhere and nowhere,

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all at once. In an electron existing in a superposition

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of spin up and spin down simultaneously, it only appears

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to choose a definitive state when we or something else

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interacts with it, when it's observed or measured.

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Speaker 2: To really try and wrap your head around this, think

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about it this way. Imagine you're holding a perfectly balanced coin,

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spinning it rapidly in the air before it lands. You

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don't know if it's heads or tails. Classically, it is

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either heads or tails, you just don't know which. But

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in the quantum world, that spinning coin is actually both

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heads and tails at the same time. Wow, Okay, it's

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not just our lack of knowledge about its state. The

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particle itself embodies all its potential states concurrently. It exists

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as this cloud of probabilities until an observation forces it

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to pick one. It's a fundamental aspect of reality, not

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just some limit on what we can know.

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Speaker 1: And nothing demonstrates this mind bending reality, this strange dance

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between possibility and actuality. Quite like the double slit experiment. Oh,

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if you've ever heard physicists sound confused, this experiment is

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probably why it's famous for baffling generations of scientists. So

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here's how it works. You shoot single electrons one at

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a time at a wall that has two very small

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slits or holes on the other side of the wall.

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There's a screen to catch where the electrons land. Now,

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what you'd expect if electrons were just tiny little particles

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like little bullets, is two distinct lines on the screen

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right matching the slits.

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Speaker 2: That's the intuitive thing. Yeah, that's not what happens, and

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that's where the profound disruption of reality comes in. Instead

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of two lines, an interference pattern appears on the screen

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like waves, exactly like what you'd see if waves were

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passing through both slits and then constructively and destructively interfering

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with each other. It's as if each single electron somehow

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traveled through both slits at once, behaving like a wave

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not a particle.

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Speaker 1: Okay, that's weird enough.

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Speaker 2: But wait, there's more. Here's the kicker. If you try

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to figure out which let the electron goes through by

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placing a detector.

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Speaker 1: On one of the holes, you try to peak.

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Speaker 2: You try to peak exactly, the interference pattern just vanishes.

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Poof the electrons suddenly start acting like distinct particles again,

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creating just two simple smudges on the screen. The very

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active measurement of observing seemingly changes reality from this wave

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like possibility to a particle like certainty.

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Speaker 1: Okay, if you're feeling confused, perplexed, or like your brain

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just tried to fold in on itself, trust me, you

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are an excellent company. Even the giants of physics scratch

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their heads over this one absolutely. Richard Feynman no Bill Laureate,

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one of the most brilliant minds in quantum electro dynamics.

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He famously stated, I think I can safely say that

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nobody understands quantum mechanics.

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Speaker 2: It's a great quote because it's true.

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Speaker 1: I remember first learning about this experiment, probably in college physics,

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and my initial reaction was just wait, what so reality

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just decides what to be when we look at it.

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It's an almost existential kind of weirdness it is. It's

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reassuring in a strange way that even the masters gravel

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with the fundamental mystery of it all. So, given all

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this quantum weirdness, what does this all mean for our

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everyday experience of reality. We have these truly bizarre rules

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for the quantum world, and then we have our classical world,

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you know, the world of tables, chairs, and people, where

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things seem pretty definite solid. How did these two connect?

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How does a fuzzy everywhere at once particle decide to

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be here now and appear as a definite particle? This,

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my friends, is the measurement problem, the big one. It's

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a grand mystery. The central question of how this quantum

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wavelike state described by the wave function suddenly transitions into

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the more familiar classical particle like behavior after measurement. So

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the point where quantum theory seems to hit a wall

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really a paradox that has fueled endless debate.

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Speaker 2: This is indeed the point of contention that gave rise

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to vastly different interpretations of quantum mechanics. And it's not

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just a technicality or some minor detail for physicists. It's

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about the fundamental nature of reality itself. For over a century,

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physicists and philosophers have argued passionately about what quantum mechanics

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really means for the nature of existence, and the measurement

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problem lies at the very heart of that profound debate.

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It forces us to ask what is reality when we're

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not looking.

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Speaker 1: For many decades, the dominant view, the kind of prevailing orthodoxy,

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if you will, has been the Copenhagen interpretation. This interpretation

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largely developed by folks like Nils Bohr and Werner Heisenberg.

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Speaker 2: The pioneers.

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Speaker 1: It posits that superposition states, those fuzzy states, they persist

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until they are observed at that precise moment of observation.

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The wave function collapses, that's the term they use. It

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collapses down into a single, sharp, definite state.

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Speaker 2: And crucially, the probability of which state it collapses into

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is given by the Born rule. Ah.

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Speaker 1: Yes, the Born rule.

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Speaker 2: Named after Max Bourne. It's crucial because it assigns probabilities

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to each possible outcome of a quantum measurement. So while

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a particle might be in multiple states at once, the

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Born rule tells us precisely the likelihood of which state

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will observe when we actually look. It's the mathematical backbone

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for predicting experimental results.

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Speaker 1: And it works right pragmatically speaking, oh incredibly well.

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Speaker 2: This is the interpretation that allows us to build everything

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from lasers and transistors to the microchips in your phone.

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It works with, as sources say, exquisite agreement with experiments,

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making it arguably the most precisely tested theory in all

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of science, verified to within parts per trillion precision.

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Speaker 1: But there's always a butt.

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Speaker 2: There's always a butt. As you alluded to, it leaves

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a profound conceptual gap. It describes how things happen, the

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probabilities of outcomes, but not why they happen. In that

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particular way, and a crucial clarification here. Most physicists today

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reject the idea that human consciousness is the special ingredient

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needed for a wave function collapse.

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Speaker 1: Right, It's not about us looking specifically.

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Speaker 2: No, it's often considered just an interaction with the environment,

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a stray photo hitting it, any kind of irreversible recording device,

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anything macroscopic enough.

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Speaker 1: Okay, But here's where it starts to get really interesting,

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and where the Copenhagen interpretation begins to well show its cracks.

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Maybe if everything is truly quantum at its core, then

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shouldn't that quantum weirdness, that superposition and entanglement. Shouldn't it

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just spread everywhere? The problem with Copenhagen arise is because

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superpositions aren't limited to just individual particles. No, they can

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scale up right. Entire systems can be in superposition and

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become entangled. If a measurement involves an environmental interaction, like

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a single photon hitting an electron, that photon also becomes

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mixed in superposition with.

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Speaker 2: The electron it gets coupled to it.

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Speaker 1: This march of entanglement, as some call it, should logically

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spread out, eventually encompassing, not just the detector, but the

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entire lab, the planet, and even human observers like you

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and me.

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Speaker 2: The whole system becomes quantum.

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Speaker 1: But we don't feel like we're in two states at once,

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do we. We don't feel fuzzy and determine it. It

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feels like something is missing in the Copenhagen picture.

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Speaker 2: And this weirdness is most vividly illustrated, dramatized really with

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the infamous Schrodinger's cat experiment.

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Speaker 1: Ah, the poor cat.

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Speaker 2: The poor cat. Indeed, imagine, as Erwin Schrodinger famously proposed,

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a cat locked in a sealed box with a well,

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a diabolical device. Inside. There's a vial of poison gas

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linked to a quantum measurement, say whether a radioactive atom

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decays or not within a certain time, which is a

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truly random quantum event. Okay, if the atom decays, a

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hammer breaks the vial, releasing the poison and killing the cat.

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If it doesn't decay, the cat lives.

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Speaker 1: So after the critical moment before you open the box,

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the atom is in a superposition of both decayed and

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not decayed.

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Speaker 2: Exactly, And because the cat's fate is entangled with that

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quantum system, then, according to the standard rules of quantum mechanics,

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the cat itself would exist in a bizarre superposition of

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both dead and alive simultaneously.

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Speaker 1: My first thought when I learned this was always poor cat.

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But it's a brilliant, if disturbing thought experiment that shows

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just how far quantum weirdness can, in principle extend.

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Speaker 2: The Copenhagen interpretation seems to resolve this by claiming the

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act of opening the box and observing the cat collapses

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the state, forcing it to be either definitively dead or

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definitively alive.

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Speaker 1: Okay, measurement saves the day.

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Speaker 2: Sort of, sort of, But this immediately raises fundamental questions.

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Why are observers, whether it's the cat itself, a stray

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photon interacting with the system, or us opening the box?

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Why are they treated as distinct classical entities while the

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electron or atom is purely quantum?

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Speaker 1: Yeah, aren't we made of quantum stuff too?

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Speaker 2: Exactly? Surely everything deep down is quantum. We are made

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of atoms too. There's also crucially no mechanism for this mysterious,

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unitary and frankly ad hoc wave function collapse described in

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the math.

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Speaker 1: It just happened.

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Speaker 2: It just happens. It's almost like a magical curtain that

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descends at some unspecified between quantum and classical. It's effectively

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a cheat code that works beautifully to match observations, but

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doesn't really explain why reality behaves that way. It leaves

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us with an incomplete picture.

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Speaker 1: And it's precisely at this point grappling with the measurement

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problem in Schrodinger's famously Unfortunate Feline, that we encounter a

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truly radical alternative. What if the universe isn't actually making

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a choice, What if instead every single quantum possibility actually happens,

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all of them. It's a concept that sounds like pure fantasy,

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something dreamed up in a late night brainstorming session for

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a sci fi blockbuster, but it's a serious contender in physics.

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It suggests a reality far grander and far more populated

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than we ever imagined.

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Speaker 2: And this is the many world's interpretation MWI.

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Speaker 1: Right proposed by a brilliant Princeton graduate student named Hugh

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Everett the Third back in nineteen fifty seven. He suggested

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that the wave function never collapses.

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Speaker 2: Never, Instead, all possible outcomes of a quantum measurement occur,

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evolving in step, non interacting branches of reality.

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Speaker 1: Separate universes, essentially pretty much.

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Speaker 2: For a long time, Everett's many World's interpretation was largely ignored,

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seen as too outlandish, too extravagant in its implications, just

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too weird you can see why. But it has gained

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significant traction in recent decades, championed by prominent physicists and

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philosophers like Sean Carroll, David Deutsch, Max Tegmark, big names,

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big names. Everett's profound insight was simply to take the

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fundamental equation of quantum mechanics, the Schrodinger equation, completely seriously.

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There is no collapse mechanism built into that equation. It

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just describes a continuous, deterministic evolution of the wave function.

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So in MWI, the electron, the box, the cat, you me,

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indeed the entire universe are all described by one gigantic

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evolving universal wave function.

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Speaker 1: Wow. Okay, now that's big concept to wrap your head around.

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A universal wave function. Imagine, instead of each particle having

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its own quantum description, the entire universe, every atom, every galaxy,

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every consciousness is described by one colossal wave function.

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Speaker 2: That's the idea, and in MWI, this universal wave function

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never collapses. It simply evolves, encompassing all possible realities within itself.

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Speaker 1: So if the entire universe is in a superposition, why

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don't these branching realities interfere with each other like the

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electrons in the double slit experiment? How come we only

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experience one reality? Ah?

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Speaker 2: That's where the critical concept of decoherence comes in. In

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place of wave function collapse. MWI explains the classical appearance

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of our macroscopic world, the reason we experience only one

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reality through this natural mechanism decoherence.

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Speaker 1: Okay, how does that work?

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Speaker 2: Well? If we connect this to the bigger picture, decoherence

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is the key to understanding why we only perceive one

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reality even if countless others are splitting off. It's the

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natural process that effectively isolates these branching universes from each other,

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making them appear non interacting.

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Speaker 1: From our perspective, so they don't interfere.

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Speaker 2: Right. In very simple isolated quantum systems like single electrons

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going through slits, the quantum waves can stay in sync

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and interfere, leading to those strange double slit patterns. But

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in complex systems like a cat in a box, or

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indeed any macroscopic object. Interactions with countless particles in the environment,

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stray photons, air molecules, thermal vibrations. They scramble their phases.

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Speaker 1: Scramble their phases.

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Speaker 2: Okay, it's like throwing a perfectly tuned choir into a

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chaotic mosh pit. The individual voices become impossible to distinguish.

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Their coherence is lost. This scrambling leads to a clean

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split between worlds, where interference effects are exponentially suppressed. The

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branching isn't some abrupt magical event. It's a continuous evolution

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as decoherence spreads, solidifying the distinct realities.

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Speaker 1: It's astonishing to consider the scale of this. The number

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of these universes would be well stupendous, as the sources say,

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having branched since the Big Bang and continuing across the

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entire cosmos. With every single quantum event.

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Speaker 2: Every interaction, potentially, it's like.

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Speaker 1: Every decision, every random decay, every photon interaction creates new realities.

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I even recall hearing about a universe splitter app that

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claims to base decisions on a quantum measurement in Switzerland.

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Speaker 2: I've heard of that.

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Speaker 1: Yeah, essentially suggesting that in one branch you went left

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and another you went right. So in this branch of reality,

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I'm here recording this deep dive with you, but in

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countless others I might be doing something entirely different. Maybe

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I'm a professional competitive.

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Speaker 2: Eater somewhere, or maybe you actually mastered quantum mechanics yourself. Huh.

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Speaker 1: Maybe in MWI, both of those possibilities truly happened somewhere.

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Speaker 2: And if this whole idea of constantly splitting into infinite

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versions of yourself bothers you, you're certainly not alone. It's

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a profound challenge to our common sense.

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Speaker 1: It really is.

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Speaker 2: Theoretical physicist Bryce DeWitt, who was initially a critic and

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then became a prominent advocate for MWI, he initially expressed

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this very discomfort. He told Richie was bothered by the

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gut feeling that he didn't feel like he was constantly

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splitting into parallel versions of himself. It's a very human reaction.

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Speaker 1: I get that, and Everett's brilliant retort to do it Apparently,

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he coolly responded, do you feel like you're orbiting the

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Sun at thirty kilometers per second?

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Speaker 2: Great?

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Speaker 1: Comeback, de Witt conceded on the spot, it's a fantastic illustration.

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This exchange highlights an important truth. Our everyday senses and

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subjective experience often don't align with scientific reality. Our intuition

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can be a really unreliable guide when dealing with fundamental physics.

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We don't feel the earth spinning, we don't feel the

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air pressure on our skin, and we certainly don't feel

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ourselves splitting into infinite realities. But just because you don't

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feel it doesn't mean it's not happening. At least ac

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quoted this interpretation, it challenges us to look beyond our

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immediate perception. And now, let's truly dive into the profound

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and some might say terrifying, personal implication of the Many

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World's interpretation. Here's where it gets really mind bending. Amongst physicists,

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the MWY has grown significantly in popularity, mainly thanks to

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its rigorous treatment of the Schrodinger equation, avoiding that ad

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hoc collapse.

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Speaker 2: Right, it's mathematically cleaner in some ways.

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Speaker 1: But as the idea has gained traction many he realized

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that taking it seriously implies a bizarre and truly radical consequence.

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Quantum immortality.

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Speaker 2: Ah yes, the ultimate implication.

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Speaker 1: This idea is often best understood through a thought experiment

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involving a rather macabre game of quantum Russian Roulette, famously

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popularized by physicist Max Tegmark in his book Are Mathematical Universe.

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Speaker 2: It's a Vivid one. Teg Mark describes this as a

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quantum machine gun which can fire up to once per

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second depending on the outcome of a quantum measurement. Okay, specifically,

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each time it's triggered, it places a particle, say an electron,

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in a superposition equally likely to be spin up or

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spin down. Then it measures that spin. If it's spined down,

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the gun fires, delivering a fatal blow that kills you

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faster than human perception can register in a death instant death.

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If it's spin up, it simply makes an audible click

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and the experiment repeats for another second. It's a stark

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and brutal thought experiment, really designed to push the boundaries

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of our understanding of consciousness and survival.

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Speaker 1: So let's play this out. According to Everett's MWI, after

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the very first second, there will be two parallel universes

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that split off, one where you are dead and one

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where you are alive having heard a click. Now here's

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the astonishing conclusion the core of quantum immortality. There is

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exactly one copy of you that have perceptions and a

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stream of consciousness both before and after.

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Speaker 2: The experiment, only one experiencing self.

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Speaker 1: Think about that, since you can't experience not being alive,

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oblivion has no subjective experience. The prediction for your stream

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of consciousness is that you will hear an audible click

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and survive this measurement with one hundred percent certainty from

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your perspective. From your perspective, you could theoretically experienced dozens

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of clicks in a row, somehow surviving time after time,

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defying all classical eyds. Imagine being the main character in

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infinite choose your own adventure story, always picking the a

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live page, always turning to the chapter where you continue on.

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It's an extraordinary, almost miraculous prediction.

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Speaker 2: And if we consider the probabilities after say forty sequential clicks,

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the Copenhagen interpretation will predict an almost infinitesimally small chance

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of survival like one in a trillion, basically zero, basically zero.

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But MWI predicts one hundred percent survival for a version

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of you. You, the conscious observer experiencing click after click

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after click, would thus be able to conclude that Everett's

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idea was right all along.

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Speaker 1: Wow.

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Speaker 2: However, this proof, as the sources emphasize, is intensely personal.

403
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It's a strangely private proof, because in those trillion other universes,

404
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everyone else would just watch you die, wondering why you

405
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would do such a thing. They would not see this

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proof of your continuous survival. They would only observe your

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demise in their particular branch. It's a deeply isolated and

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subjective experience of immortality.

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Speaker 1: And this wasn't just some abstract intellectual exercise for the

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theory's creator, was it Hugh Everett himself.

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Speaker 2: No, Apparently he really believed it, though he never published

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on it directly. Sources say he firmly believed that his

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Many World's theory guaranteed him immortality.

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Speaker 1: He thought he couldn't die.

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Speaker 2: His consciousness, he argued, is bound at each branching to

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follow whatever path that does not lead to death, and

417
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so on, ad infinitum. It's a powerful personal conviction. Although,

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and this is a poignant detail in our particular branch

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of reality, the one we are currently inhabiting. He sadly

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died at the age of fifty one, perhaps never seeing

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his theory gain the widespread recognition it now enjoys. This

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personal belief really demonstrates the profound, almost spiritual implications that

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the theory held for its creator made it more than

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just a dry scientific hypothesis for him.

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Speaker 1: Yeah.

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Speaker 2: Absolutely, but this raises an important point, and one that

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absolutely needs to be emphasized again and again. While we

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are exploring these fascinating thought experiments in their radical implications,

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it's absolutely vital to reiterate that these are purely hypothetical discussions.

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These are not recommendations for any kind of real world action.

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Teg Mark himself is very clear that he absolutely does

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not recommend conducting this experiment, and.

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Speaker 1: I want to emphasize that point here too, with every

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fiber of my being. It would be incredibly stupid, foolish,

435
00:23:31,839 --> 00:23:34,599
and idiotic to engage in this experiment at home or

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00:23:34,640 --> 00:23:37,039
anywhere else for that matter. Please do not try this,

437
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Please don't but hypothetically for the sake of the argument.

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Tech Mark argues that there are three crucial criteria needed

439
00:23:43,839 --> 00:23:47,599
to make this macabre experiment of quantum Russian roulette theoretically

440
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work and guarantee your perceived survival.

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Speaker 2: Okay, what are they?

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Speaker 1: First, the random decisions must be truly quantum, can't be

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a rigged classical coin flip. Second, the mechanism must kill

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you or make you unconscious on a timescale shorter than

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that which you can perceive basically instant oblivion okay, faster

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than thought. And Third, it must really kill you, not

447
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just very badly, injure you complete cessation in that branch.

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Satisfy those three, the argument goes, and you miraculously survive.

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From your perspective.

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Speaker 2: What's truly fascinating here is how philosopher David Lewis, in

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a compelling two thousand and one lecture, apparently expanded this

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idea of quantum immortality beyond just a contrived theoretical experiment

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like the gun. How So, he applied it to every

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moment of our lives. He broadened the concept of quantum

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Russian roulette to what he termed broad immortality. Broad immortality, yeah,

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reasoning that the entire universe is ultimately governed by quantum events. Therefore,

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he argued all causes of death satisfied teg Mark's first

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and third criteria, they are fundamentally quantum at some level,

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and they really kill you.

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Speaker 1: WHOA, it's a huge lead. The implications are stunning.

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Speaker 2: Aren't they. For example, Lewis suggested that if a car's

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about to hit you, there is a stupendously small probability,

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but a non zero one. Crucially, that some quantum fluctuation

464
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will cause the vehicle to quantum tunnel straight through you

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without harm, like a ghost car. Essentially, yeah, according to

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Mwi and Lewis's extension of it, a version of you

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must survive such encounters, no matter how improbable. It implies

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this astonishing, almost supernatural resilience inherent in our existence.

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Speaker 1: So Lewis's correct.

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Speaker 2: If Lewis is correct and quantum immortality is broadly applicable,

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then eventually each of us will one day gain personal

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evidence from many worlds, for we will seem to always

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escape life threatening car crashes, survive health scares, and eventually

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outlive our friends and our family simply by always finding

475
00:25:45,480 --> 00:25:48,960
ourselves in the branch where we somehow miraculously survived.

476
00:25:49,200 --> 00:25:52,039
Speaker 1: Talk about being the luckiest person in the universe, over

477
00:25:52,079 --> 00:25:53,079
and over and over again.

478
00:25:53,240 --> 00:25:56,400
Speaker 2: However, it's important to note that Tegmark himself isn't fully

479
00:25:56,480 --> 00:26:00,599
on board with Lewis's position on this broad immortality, specifically

480
00:26:00,680 --> 00:26:02,640
because of his second criteria.

481
00:26:02,200 --> 00:26:03,440
Speaker 1: The instantaneous death part.

482
00:26:03,759 --> 00:26:07,359
Speaker 2: Exactly, most causes of death tech Mark would argue involve

483
00:26:07,400 --> 00:26:11,359
a slower deterioration like organ failure or a drawn out illness,

484
00:26:11,519 --> 00:26:16,240
not a sudden, instantaneous event faster than perception. But Lewis,

485
00:26:16,319 --> 00:26:20,279
with a truly unsettling foresight, seems to have anticipated this objection,

486
00:26:20,880 --> 00:26:23,799
and it leads to a frankly dark and terrible prediction

487
00:26:23,880 --> 00:26:27,400
for us all. He concedes that, yes, in general, you

488
00:26:27,480 --> 00:26:32,440
will deteriorate. However, from the perspective of quantum immortality, all

489
00:26:32,480 --> 00:26:35,720
you need to do is survive each moment, not necessarily

490
00:26:35,720 --> 00:26:37,559
come out the side particularly healthy.

491
00:26:37,720 --> 00:26:40,559
Speaker 1: Oh no, so what does this mean for the quality

492
00:26:40,599 --> 00:26:42,559
of this potentially eternal life.

493
00:26:42,640 --> 00:26:46,400
Speaker 2: Well, Lewis presents a truly chilling vision of immortality. If

494
00:26:46,440 --> 00:26:49,079
you perpetually find yourself in the branch where you survive,

495
00:26:49,160 --> 00:26:52,359
but those branches often involve accumulating damage or aging, then

496
00:26:52,440 --> 00:26:55,200
over time you would accumulate ever more deterioration.

497
00:26:55,440 --> 00:26:58,400
Speaker 1: You just keep getting older and more broken forever.

498
00:26:58,599 --> 00:27:01,039
Speaker 2: That's the implication you could become like the tragic strolled

499
00:27:01,079 --> 00:27:04,720
Brugs from Jonathan Swift's Sculliver's Travels, Remember Them, a race

500
00:27:04,759 --> 00:27:09,000
of immortals doomed to eternal decrepitude, misery, and isolation, watching

501
00:27:09,039 --> 00:27:10,759
everyone they love die.

502
00:27:10,599 --> 00:27:13,359
Speaker 1: Or like the characters in that dark comedy, death becomes

503
00:27:13,400 --> 00:27:16,160
her just barely holding themselves together exactly.

504
00:27:16,839 --> 00:27:21,079
Speaker 2: Lewis himself writes with stark clarity, as you survive deadly

505
00:27:21,160 --> 00:27:24,279
danger over and over again, you should also expect to

506
00:27:24,279 --> 00:27:27,839
suffer repeated harms. You should expect to lose your loved ones,

507
00:27:27,960 --> 00:27:30,960
your eyes and limbs, your mental powers, and your health.

508
00:27:31,480 --> 00:27:34,279
Eternal life on such terms amounts to a life of

509
00:27:34,319 --> 00:27:35,200
eternal torment.

510
00:27:35,480 --> 00:27:38,839
Speaker 1: Wow. So it's not a golden, eternal youth, but potentially

511
00:27:38,880 --> 00:27:43,079
an endless, decaying existence. Is this the fate that awaits

512
00:27:43,119 --> 00:27:44,839
us all, or at least a version of us? According

513
00:27:44,880 --> 00:27:47,839
to Lewis, it's a truly unsettling thought to grapple with.

514
00:27:48,079 --> 00:27:50,759
Speaker 2: This brings us to a crucial turning point in the debate, though,

515
00:27:51,079 --> 00:27:55,519
because while quantum immortality is a profoundly compelling, almost seductive

516
00:27:55,559 --> 00:27:59,160
idea that emerges naturally from the many world's interpretation, it

517
00:27:59,279 --> 00:28:01,920
faces some pretty any significant challenges and criticisms.

518
00:28:02,000 --> 00:28:03,119
Speaker 1: Okay, let's hear the pushback.

519
00:28:03,160 --> 00:28:07,200
Speaker 2: Well. One of the primary ones revisits tech Mark's second criterion, which,

520
00:28:07,319 --> 00:28:10,720
as we discuss, states that death must occur faster than perception.

521
00:28:10,920 --> 00:28:13,759
Tech Mark himself later expressed doubts about this being met

522
00:28:13,799 --> 00:28:17,519
for most real world deaths. But a particularly strong counter

523
00:28:17,640 --> 00:28:21,240
argument comes from philosopher Charles Sevens, who argues that the

524
00:28:21,279 --> 00:28:23,720
timescale is irrelevant anyway irrelevant.

525
00:28:23,960 --> 00:28:27,000
Speaker 1: How so this is like a very strong reason why

526
00:28:27,039 --> 00:28:28,640
one should never try this experiment.

527
00:28:28,839 --> 00:28:32,720
Speaker 2: It really does. Seven's argument is quite compelling. He argues

528
00:28:32,759 --> 00:28:36,559
that after a quantum gunfires, the universe has already split

529
00:28:36,599 --> 00:28:38,839
into two, even before the bullet reaches you.

530
00:28:39,079 --> 00:28:40,839
Speaker 1: Okay, the split happens at the measurement.

531
00:28:41,039 --> 00:28:43,400
Speaker 2: Right at that moment of quantum measurement, there are already

532
00:28:43,400 --> 00:28:46,839
two distinct branches. Both versions are credibly what you might

533
00:28:46,880 --> 00:28:49,880
call you at the point of splitting, and thus he argues,

534
00:28:49,920 --> 00:28:51,920
you will die in one of them, even if you,

535
00:28:52,079 --> 00:28:55,839
from your perceived perspective, only continue in the surviving branch.

536
00:28:56,000 --> 00:28:59,400
Speaker 1: Ah, So your consciousness might continue, but a version of

537
00:28:59,480 --> 00:29:01,640
you definitely ceases exactly.

538
00:29:01,799 --> 00:29:05,440
Speaker 2: His point is that no physical process is truly instantaneous

539
00:29:05,559 --> 00:29:09,400
on the macroscopic scale of death. Even if the branching

540
00:29:09,440 --> 00:29:13,480
happens instantaneously at the quantum level, the macroscopic event of

541
00:29:13,559 --> 00:29:17,400
death itself still takes time. Seven's argument highlights that you

542
00:29:17,480 --> 00:29:20,440
might still find yourself on a dead branch regardless of

543
00:29:20,480 --> 00:29:24,279
how fast your perception is. It directly undermines the premise

544
00:29:24,319 --> 00:29:26,720
of guaranteed survival from all versions of you.

545
00:29:26,920 --> 00:29:28,839
Speaker 1: That means a lot of sense. Actually, okay, what else?

546
00:29:29,000 --> 00:29:33,079
Speaker 2: Another significant criticism of MWI, and particularly its application to

547
00:29:33,160 --> 00:29:37,079
quantum immortality, is how it deals with probabilities. This is

548
00:29:37,160 --> 00:29:38,759
a truly thorny.

549
00:29:38,440 --> 00:29:40,480
Speaker 1: Issue because everything happens right.

550
00:29:40,640 --> 00:29:43,200
Speaker 2: Given that in MWI, all of these outcomes occur with

551
00:29:43,200 --> 00:29:46,599
one hundred percent probability across different branches, how do you

552
00:29:46,599 --> 00:29:50,920
even talk about chance everations. Those who subscribe to MWI

553
00:29:51,000 --> 00:29:54,000
typically address this by assigning a measure of existence or

554
00:29:54,039 --> 00:29:57,240
intensity to each reality, which is derived from the born

555
00:29:57,319 --> 00:30:00,119
role we discussed earlier. This basically allows them to talk

556
00:30:00,119 --> 00:30:03,079
about some branches being more real or more probable to

557
00:30:03,200 --> 00:30:06,680
experience than others, matching the experimental probabilities we see.

558
00:30:06,720 --> 00:30:10,200
Speaker 1: And this is where Lewis's pivotal move for quantum immortality,

559
00:30:10,640 --> 00:30:14,119
his corrected intensity rule comes into play. You called it

560
00:30:14,160 --> 00:30:14,920
a trick earlier.

561
00:30:15,200 --> 00:30:18,480
Speaker 2: Well, it's certainly clever, some might say too clever. He

562
00:30:18,640 --> 00:30:20,640
essentially discards all of the cases.

563
00:30:20,319 --> 00:30:21,960
Speaker 1: Where you die, just ignores them.

564
00:30:22,039 --> 00:30:24,839
Speaker 2: His argument is because death is oblivion, and there is

565
00:30:24,880 --> 00:30:27,799
no such experience from your point of view. So after

566
00:30:27,880 --> 00:30:31,880
discarding these dead branches, he then renormalizes the probabilities for

567
00:30:31,920 --> 00:30:33,400
the remaining alive.

568
00:30:33,119 --> 00:30:36,200
Speaker 1: Branches, so he recalculates the odds based only on the

569
00:30:36,240 --> 00:30:37,359
survivors exactly.

570
00:30:37,519 --> 00:30:40,559
Speaker 2: So, for example, if a quantum event has four equally

571
00:30:40,640 --> 00:30:43,839
likely outcomes and you perish in three of them, Copenhagen

572
00:30:43,880 --> 00:30:46,440
would say you have a twenty five percent chance of survival.

573
00:30:46,720 --> 00:30:50,319
Mwi would say all four happen. But Lewis, in his

574
00:30:50,559 --> 00:30:54,279
argument for QI, discards the three death branches, leaving only

575
00:30:54,279 --> 00:30:57,359
the one where you survive, making your personal probability of

576
00:30:57,400 --> 00:31:01,000
survival in that branch one hundred percent. That feels convenient,

577
00:31:01,319 --> 00:31:06,319
and many prominent thinkers, including fellow Everessians, takes serious issue

578
00:31:06,319 --> 00:31:10,640
with this philosophical sleight of hand. Philosopher David Papineau writes

579
00:31:11,319 --> 00:31:14,599
it is by no means obvious why everessians should modify

580
00:31:14,640 --> 00:31:17,599
their intensity rule in this way, For it seems perfectly

581
00:31:17,599 --> 00:31:20,640
open for them to apply the unmodified intensity rule in

582
00:31:20,680 --> 00:31:24,519
life or death situations just as elsewhere. Why make an

583
00:31:24,559 --> 00:31:28,279
exception just for death? Good question and many World champion

584
00:31:28,359 --> 00:31:32,160
David Deutsch also pushes back. He states this way of

585
00:31:32,200 --> 00:31:35,880
applying probabilities does not follow directly from quantum theory as

586
00:31:35,880 --> 00:31:39,680
the usual one does. He argues, it requires an additional assumption,

587
00:31:40,039 --> 00:31:43,519
namely that when making decisions, one should ignore the histories

588
00:31:43,519 --> 00:31:46,119
in which the decision maker is absent. My guess is

589
00:31:46,200 --> 00:31:47,359
that this assumption is false.

590
00:31:47,480 --> 00:31:49,440
Speaker 1: So what's the fundamental issue here? It sounds like this

591
00:31:49,480 --> 00:31:52,680
is a major philosophical weakness for quantum immortality.

592
00:31:52,839 --> 00:31:56,039
Speaker 2: It really is. Lewis's argument isn't a direct derivation from

593
00:31:56,119 --> 00:31:58,640
quantum theory. It's an added assumption about how we should

594
00:31:58,640 --> 00:32:02,480
interpret probabilities when it comes to personal survival. It implies

595
00:32:02,519 --> 00:32:04,519
there's by no means a guarantee that you will take

596
00:32:04,599 --> 00:32:05,799
the path in which you survive.

597
00:32:06,160 --> 00:32:09,519
Speaker 1: Basically, Lewis is saying, if you're not there to experience it,

598
00:32:09,519 --> 00:32:13,240
it doesn't count for your probability. But is that really

599
00:32:13,319 --> 00:32:15,960
a fair or consistent way to apply the rules of

600
00:32:16,039 --> 00:32:19,920
quantum mechanics. It feels suspiciously like we're playing favorites with

601
00:32:19,960 --> 00:32:24,400
our own survival kind of retroactively applying a survival biases

602
00:32:24,680 --> 00:32:26,160
to the laws of physics itself.

603
00:32:26,400 --> 00:32:29,559
Speaker 2: It does raise those questions, and all this quantum weirdness

604
00:32:29,599 --> 00:32:32,839
and the philosophical gymnastics required to make sense of it

605
00:32:32,880 --> 00:32:36,119
makes it difficult to know what's truly real. Sometimes more

606
00:32:36,200 --> 00:32:39,240
conventional analogies help us grapple with identity, even if there's

607
00:32:39,279 --> 00:32:42,000
still a bit sci fi like what consider the classic

608
00:32:42,119 --> 00:32:46,680
Star Trek transporter analogy. Imagine a transporter that malfunctions, creating

609
00:32:46,720 --> 00:32:50,319
two perfect copies of you at the destination. From your perspective, you.

610
00:32:50,319 --> 00:32:52,920
Speaker 1: Persist, okay, seems fine to Me's.

611
00:32:53,039 --> 00:32:56,240
Speaker 2: Now, what if one of those rematerializations fails, leaving just

612
00:32:56,319 --> 00:32:59,000
a gory mess. Would you be disturbed by stepping onto

613
00:32:59,000 --> 00:32:59,839
the pad next time?

614
00:33:00,200 --> 00:33:01,119
Speaker 1: Uh? Yeah.

615
00:33:02,200 --> 00:33:04,759
Speaker 2: Some might argue the dead version never materialized enough to

616
00:33:04,799 --> 00:33:08,559
experience consciousness, so nothing was truly lost from your perspective.

617
00:33:09,119 --> 00:33:12,480
But what if the failed beam was just deleted inside

618
00:33:12,519 --> 00:33:16,200
the computer without ever materializing. Is this equivalent to a

619
00:33:16,240 --> 00:33:19,599
safe one to one transport or is something still lost?

620
00:33:20,079 --> 00:33:23,440
This analogy highlights the deep confusion about what constitutes you

621
00:33:23,960 --> 00:33:28,160
and what truly persists even in a hypothetical classical context.

622
00:33:28,599 --> 00:33:32,079
Does your consciousness just follow the successful copy or is

623
00:33:32,119 --> 00:33:33,759
a part of you still lost?

624
00:33:34,039 --> 00:33:38,680
Speaker 1: Yeah, that's tricky. Sean Carroll, another prominent MWY advocate, offers

625
00:33:38,680 --> 00:33:42,480
a more classical analogy to strongly disagree with Lewis's idea

626
00:33:42,519 --> 00:33:44,319
of not being bothered by dead branches.

627
00:33:44,359 --> 00:33:45,079
Speaker 2: What's his take?

628
00:33:45,680 --> 00:33:48,359
Speaker 1: Carry deposits that if someone instantly kills you from behind,

629
00:33:48,400 --> 00:33:51,000
you don't experience being dead in that moment, obviously, but

630
00:33:51,039 --> 00:33:53,359
as he points out, it is totally reasonable to not

631
00:33:53,400 --> 00:33:55,960
want to be killed regardless. Sure, the reason why we

632
00:33:56,000 --> 00:33:57,599
don't want to die is not just that we might

633
00:33:57,640 --> 00:34:02,119
experience pain, but that the idea of being dead in

634
00:34:02,119 --> 00:34:05,960
the future bothers me right now. Perspectively, it's the finality,

635
00:34:06,039 --> 00:34:07,880
the cessation of existence, that we fear.

636
00:34:08,920 --> 00:34:12,639
Speaker 2: But Lewis, however, would likely argue Carol's scenario is a

637
00:34:12,960 --> 00:34:16,400
very different beast wow, because in that classical case, you

638
00:34:16,480 --> 00:34:21,360
definitely do die and your consciousness ceases entirely. Lewis would

639
00:34:21,400 --> 00:34:24,559
maintain that in the quantum picture, your stream of consciousness

640
00:34:24,599 --> 00:34:29,559
continues uninterrupted in some branch, meaning there is no finality

641
00:34:29,639 --> 00:34:33,440
from your perceived perspective. One version always carries on.

642
00:34:33,599 --> 00:34:35,320
Speaker 1: Ah the uninterrupted stream.

643
00:34:35,480 --> 00:34:38,360
Speaker 2: What's truly fascinating here is how these thought experiments, whether

644
00:34:38,400 --> 00:34:42,840
futuristic transporters or mundane fatal attacks, force us to confront

645
00:34:42,840 --> 00:34:46,440
our deepest anxieties about death and identity. Does the lack

646
00:34:46,480 --> 00:34:49,559
of a subjective experience of death truly make it irrelevant

647
00:34:49,559 --> 00:34:52,960
to us to our continuous stream of consciousness, or is

648
00:34:53,000 --> 00:34:55,480
the very idea of a part of our potential self

649
00:34:55,559 --> 00:34:59,280
ceasing to exist still a profound loss. It's a question

650
00:34:59,320 --> 00:35:01,519
that cuts to the very verre of what we value

651
00:35:01,519 --> 00:35:02,280
about life.

652
00:35:02,440 --> 00:35:05,159
Speaker 1: And finally, there's what's known as the anthropic attack against

653
00:35:05,239 --> 00:35:08,920
quantum immortality, which revisits something called the mediocrity principle.

654
00:35:08,920 --> 00:35:10,320
Speaker 2: Okay, the mediocrity principle.

655
00:35:10,639 --> 00:35:14,559
Speaker 1: This principle, in its simplest form, suggests that there's nothing

656
00:35:14,559 --> 00:35:17,880
special about our position in the universe. We should expect

657
00:35:17,920 --> 00:35:21,440
to observe ourselves in a difficult rather than extraordinary state.

658
00:35:22,079 --> 00:35:25,519
Now if we really live forever in increasingly decrepit states

659
00:35:25,639 --> 00:35:30,199
as Lewis's Eternal Torment, scenario suggests, then there will be far,

660
00:35:30,480 --> 00:35:33,760
far more years of you alive in that decrepit state

661
00:35:34,159 --> 00:35:37,039
than the relative youth and health that we all enjoy now.

662
00:35:37,239 --> 00:35:41,400
In your entire quantum immortal existence, it would be incredibly

663
00:35:41,480 --> 00:35:44,559
unlikely that you'd happen to inhabit a moment during your well,

664
00:35:44,920 --> 00:35:48,159
your normal aged life, rather than those strollbrug years which

665
00:35:48,159 --> 00:35:49,599
would stretch on for eons.

666
00:35:49,719 --> 00:35:52,639
Speaker 2: So we should expect to find ourselves old and decrepit right.

667
00:35:52,519 --> 00:35:55,239
Speaker 1: Now, according to a strict application of the principle. Yes,

668
00:35:55,760 --> 00:35:57,760
it seems like our current youthful state would be an

669
00:35:57,760 --> 00:35:59,800
extremely improbable moment to experience.

670
00:36:00,079 --> 00:36:03,159
Speaker 2: That's a powerful argument. However, it can be challenged on

671
00:36:03,239 --> 00:36:04,960
the issue of reference class.

672
00:36:05,000 --> 00:36:06,320
Speaker 1: Reference class. Explain that.

673
00:36:06,480 --> 00:36:10,360
Speaker 2: Okay, to explain reference class, Imagine you want to know

674
00:36:10,400 --> 00:36:13,599
the probability of being a human. If your reference class

675
00:36:13,639 --> 00:36:16,280
is all things in the universe, the probability is tiny.

676
00:36:16,599 --> 00:36:19,000
If your reference class is all living beings on Earth,

677
00:36:19,039 --> 00:36:21,920
it's much higher. The probability depends on the group you're

678
00:36:21,920 --> 00:36:22,760
comparing yourself to.

679
00:36:22,920 --> 00:36:23,239
Speaker 1: Got it.

680
00:36:23,840 --> 00:36:26,920
Speaker 2: So the counter argument here suggests we might be comparing

681
00:36:26,960 --> 00:36:30,800
apples and oranges. Perhaps your current young, healthy state is

682
00:36:30,840 --> 00:36:34,719
so fundamentally different from your future decrepit state that it

683
00:36:34,760 --> 00:36:37,119
belongs to a separate reference class entirely.

684
00:36:37,639 --> 00:36:40,239
Speaker 1: Ah, so you compare yourself to other young people, not

685
00:36:40,519 --> 00:36:42,559
your future decrepitself exactly.

686
00:36:42,719 --> 00:36:45,800
Speaker 2: This means your current youthful state is a mediocre typical

687
00:36:45,840 --> 00:36:49,280
position within its own class of healthy, normal aged humans.

688
00:36:50,000 --> 00:36:52,719
So while this argument can't deliver a knockout blow to

689
00:36:52,800 --> 00:36:57,159
quantum immortality, it's a compelling point that challenges the probability

690
00:36:57,199 --> 00:37:00,280
of our current subjective experience within such a framework, and

691
00:37:00,360 --> 00:37:02,679
one that proponents of QI must contend with.

692
00:37:03,119 --> 00:37:06,920
Speaker 1: It's a powerful and subtle argument. Though. If you're guaranteed

693
00:37:06,960 --> 00:37:09,840
to live for an eternity, with most of that eternity

694
00:37:09,880 --> 00:37:13,360
spent in a state of advanced decline and suffering, why

695
00:37:13,400 --> 00:37:17,480
would you right now be experiencing your relatively brief period

696
00:37:17,519 --> 00:37:20,360
of youth and health. It's like picking a random page

697
00:37:20,440 --> 00:37:23,400
in an endless multi volume book and landing right on

698
00:37:23,440 --> 00:37:26,119
the introduction or maybe the first chapter. It seems a

699
00:37:26,119 --> 00:37:29,320
bit too convenient, a bit too special, which runs against

700
00:37:29,320 --> 00:37:31,840
that mediocrity principle. It certainly gives me pause.

701
00:37:32,199 --> 00:37:34,480
Speaker 2: And you know, all of this brings us to perhaps

702
00:37:34,559 --> 00:37:37,639
the most fundamental question raised by quantum immortality, one that

703
00:37:37,679 --> 00:37:41,159
really transcends physics and delves deep into philosophy, which is

704
00:37:41,360 --> 00:37:45,400
the entire discussion implicitly raises the profound question what does

705
00:37:45,440 --> 00:37:48,559
it really mean to talk about you? Your consciousness, your identity,

706
00:37:48,639 --> 00:37:53,239
your selfhood. Yeah, this is quite possibly the most difficult

707
00:37:53,360 --> 00:37:56,239
question that humanity has wrestled with throughout the ages, with

708
00:37:56,440 --> 00:38:01,519
absolutely no agreement in philosophy, psychology, or neuro science. Perhaps

709
00:38:01,599 --> 00:38:04,920
the most fundamental challenge presented by quantum immortality isn't just

710
00:38:04,960 --> 00:38:09,159
about physics, but about the deeply personal philosophical question of

711
00:38:09,239 --> 00:38:12,239
what defines me? When I might be branching into infinite

712
00:38:12,320 --> 00:38:14,880
versions across an ever splitting multiverse.

713
00:38:15,000 --> 00:38:18,679
Speaker 1: Absolutely, quantum immortality forces us to confront the very nature

714
00:38:18,760 --> 00:38:23,480
of personal identity in this branching, multitudinous universe. It takes

715
00:38:23,480 --> 00:38:27,719
this ancient, abstract philosophical question of selfhood and grounds it

716
00:38:27,760 --> 00:38:31,360
firmly in a physical theory, making it startlingly concrete. And

717
00:38:31,440 --> 00:38:34,480
as you might expect, thinkers approach this problem of identity

718
00:38:34,480 --> 00:38:36,519
in the multiverse in wildly.

719
00:38:36,079 --> 00:38:38,840
Speaker 2: Different ways, oh, definitely, each with their own compelling and

720
00:38:38,880 --> 00:38:43,079
sometimes unsettling conclusions. Kub take for instance, my Columbia colleague,

721
00:38:43,119 --> 00:38:46,320
the renowned physicist Brian Greene. He offers what he calls

722
00:38:46,320 --> 00:38:49,639
the sum total view. He suggests that each copy is.

723
00:38:49,639 --> 00:38:50,480
Speaker 1: You, all of them are me.

724
00:38:50,960 --> 00:38:54,360
Speaker 2: Yeah, he argues, we need to broaden your mind beyond

725
00:38:54,440 --> 00:38:57,880
your parochial idea of what you means. In this view,

726
00:38:58,480 --> 00:39:02,280
each of these individuals has their own consciousness, but the

727
00:39:02,400 --> 00:39:05,840
real you is there sum total, an aggregate of all

728
00:39:05,880 --> 00:39:10,199
your branching cells across the multiverse. It's an expansive, almost

729
00:39:10,280 --> 00:39:12,119
cosmic definition of identity.

730
00:39:12,360 --> 00:39:13,559
Speaker 1: Wow, okay, that's one way.

731
00:39:14,000 --> 00:39:18,239
Speaker 2: In contrast, Lev Wadman, another prominent MWI proponent, takes a

732
00:39:18,280 --> 00:39:22,480
more pragmatic, almost minimalist view. He states, there are many

733
00:39:22,480 --> 00:39:25,559
different Leves in different worlds, but it is meaningless to

734
00:39:25,599 --> 00:39:27,639
say that there is another I, so they're not me.

735
00:39:27,960 --> 00:39:30,840
He acknowledges beings identical to me at the time of

736
00:39:30,840 --> 00:39:33,039
splitting in each of the worlds all came from the

737
00:39:33,039 --> 00:39:35,840
same source, which is me right now. But he emphasizes

738
00:39:35,880 --> 00:39:39,000
that after the split, they are distinct individuals, different people

739
00:39:39,000 --> 00:39:40,599
who just happen to share a past.

740
00:39:41,280 --> 00:39:44,480
Speaker 1: Then there's the philosopher David Wallace, who dells even deeper

741
00:39:44,840 --> 00:39:50,159
offering a potentially well unsettling conclusion. He argues that if

742
00:39:50,519 --> 00:39:53,039
the sense of eye can only make sense if identity

743
00:39:53,079 --> 00:39:55,519
is confined to a single branch of the quantum multiverse,

744
00:39:55,599 --> 00:39:57,480
and it's not at all clear how this could happen

745
00:39:57,480 --> 00:40:01,639
in MWI, then the many World's interpretation, they have inadvertently

746
00:40:01,639 --> 00:40:04,960
demonstrated that many worlds is not a conceit of multiple selves,

747
00:40:05,440 --> 00:40:08,840
but rather it is dismantling the entire notion of selfhood.

748
00:40:09,400 --> 00:40:12,199
It denies any real meaning to you as a singular,

749
00:40:12,280 --> 00:40:13,440
persistent entity.

750
00:40:14,280 --> 00:40:17,360
Speaker 2: So MWI destroys the idea of self.

751
00:40:17,400 --> 00:40:21,559
Speaker 1: That's his radical suggestion. If you are constantly branching and splitting,

752
00:40:22,039 --> 00:40:25,840
the very concept of a unique, unbroken self might just

753
00:40:25,880 --> 00:40:28,920
dissolve entirely. It's a profoundly disquieting thought.

754
00:40:29,039 --> 00:40:32,760
Speaker 2: This conflict, this collision between what quantum mechanics describes and

755
00:40:32,800 --> 00:40:36,039
what our intuitive sense of self demands. It is reminiscent

756
00:40:36,079 --> 00:40:39,079
of another great debate in modern physics, the black hole

757
00:40:39,119 --> 00:40:43,920
information paradox. So in that paradox, two seemingly sound theories

758
00:40:44,079 --> 00:40:47,960
quantum mechanics and general relativity collide when applied to black hole,

759
00:40:48,039 --> 00:40:51,360
suggesting something is amiss in our fundamental understanding of one

760
00:40:51,440 --> 00:40:54,840
or both theories. Here, quantum mechanics seems to collide directly

761
00:40:54,920 --> 00:40:58,480
with our fundamental understanding of selfhood, suggesting a similarly deep

762
00:40:58,519 --> 00:41:03,119
seated problem the fundamental comp exactly. Cosmologist David Garay go

763
00:41:03,280 --> 00:41:05,760
so far as to argue that the entire debacle can

764
00:41:05,760 --> 00:41:09,159
be characterized as a reductio ad absurdum against our current

765
00:41:09,239 --> 00:41:11,679
understanding of many worlds and the theory of the mind.

766
00:41:11,840 --> 00:41:15,039
Speaker 1: A reductio ad absurdum remind us right.

767
00:41:15,119 --> 00:41:17,599
Speaker 2: It's a philosophical technique where you prove a statement is

768
00:41:17,639 --> 00:41:20,360
true by assuming its opposite is true and then showing

769
00:41:20,360 --> 00:41:24,280
that assumption leads to a ridiculous or impossible conclusion. Aguar

770
00:41:24,360 --> 00:41:27,880
suggests that the implications for selfhood under MWI are so absurd,

771
00:41:28,239 --> 00:41:30,639
so contradictory to our experience, that it points to a

772
00:41:30,679 --> 00:41:34,360
fundamental flaw in either MWI itself or our basic theory

773
00:41:34,360 --> 00:41:35,519
of mind and consciousness.

774
00:41:35,719 --> 00:41:37,679
Speaker 1: So what does this all mean for who you are?

775
00:41:38,440 --> 00:41:42,280
Are you a singular, unbroken thread of consciousness, an individual

776
00:41:42,360 --> 00:41:45,639
destined for one path, or are you a vast, branching

777
00:41:45,679 --> 00:41:49,599
network of consciousness with countless versions of you living out

778
00:41:49,679 --> 00:41:54,360
every conceivable outcome across an infinite multiverse. The deeper we

779
00:41:54,440 --> 00:41:56,880
dive into quantum reality, the more it makes us question

780
00:41:56,920 --> 00:42:00,400
who we fundamentally are. It truly blurs the line between

781
00:42:00,440 --> 00:42:03,280
physics and the most profound aspects of our personal experience.

782
00:42:04,079 --> 00:42:06,880
You know. To bring these abstract ideas into sharp of focus,

783
00:42:07,039 --> 00:42:09,760
let's look at a powerful historical example through the lens

784
00:42:09,800 --> 00:42:12,599
of many worlds. Here's where it truly gets thought provoking. Okay,

785
00:42:13,280 --> 00:42:16,679
consider October twenty seven, nineteen sixty two, a day edged

786
00:42:16,679 --> 00:42:19,960
into human memory the absolute height of the Cuban missile crisis,

787
00:42:19,960 --> 00:42:23,320
a terrifying time. On that day, a Soviet submarine near Cuba,

788
00:42:23,559 --> 00:42:26,519
the B fifty nine, was surrounded by American destroyers. The

789
00:42:26,559 --> 00:42:30,039
destroyers began dropping depth charges, non lethal ones apparently, but

790
00:42:30,159 --> 00:42:33,239
designed to force the submarine to surface high pressure situation,

791
00:42:33,360 --> 00:42:37,320
immense pressure. Believing he was under actual attack and completely

792
00:42:37,360 --> 00:42:41,719
cut off from Moscow, the Soviet captain Valentin Savitsky ordered

793
00:42:41,719 --> 00:42:45,519
his crew to launch a ten kiloton nuclear torpedo. His

794
00:42:45,599 --> 00:42:49,840
political officer, Ivan Spanovich Maslenikov agreed, Oh my god, but

795
00:42:49,920 --> 00:42:54,119
one man, the second officer, the silly Arkipov, refused. He

796
00:42:54,159 --> 00:42:56,800
stood his ground, calmed the captain and managed to talk

797
00:42:56,880 --> 00:43:00,800
him down. World War III, a nuclear catastrophe did not happen.

798
00:43:00,920 --> 00:43:02,960
Speaker 2: Wow, one man stopped it.

799
00:43:02,960 --> 00:43:06,519
Speaker 1: It's a moment where humanity truly teetered on the brink. And,

800
00:43:06,599 --> 00:43:09,679
in the Many World's interpretation, if quantum immortality were true,

801
00:43:09,719 --> 00:43:12,000
in some sense, we could never live on a branch

802
00:43:12,039 --> 00:43:14,760
where that catastrophic event occurred, because we'd be dead, because

803
00:43:14,800 --> 00:43:17,079
we'd be dead. Indeed, perhaps all of history is a

804
00:43:17,079 --> 00:43:20,239
sequence of improbable events that somehow conspired to lead to you,

805
00:43:20,320 --> 00:43:22,920
because in branches where they didn't, you aren't there.

806
00:43:23,039 --> 00:43:26,639
Speaker 2: It's a form of anthropic reasoning applied to history exactly.

807
00:43:27,320 --> 00:43:32,719
Speaker 1: This powerful historical anecdote vividly illustrates how the MWI, combined

808
00:43:32,760 --> 00:43:35,719
with an anthropic principle, the idea that we can only

809
00:43:35,760 --> 00:43:39,440
observe a universe capable of supporting our existence, might explain

810
00:43:39,519 --> 00:43:43,400
our very presence in a world where seemingly improbable events

811
00:43:43,719 --> 00:43:47,199
led to our survival. It suggests that in countless other

812
00:43:47,239 --> 00:43:50,960
branches things went terribly unimaginably wrong, but in this one,

813
00:43:51,159 --> 00:43:54,440
thanks to an improbable series of events, like Arkopov's courage,

814
00:43:54,880 --> 00:43:57,599
we get to be here, having this conversation.

815
00:43:57,320 --> 00:43:58,400
Speaker 2: It's quite a perspective.

816
00:43:58,719 --> 00:44:01,519
Speaker 1: It's easy, and maybe a bit lazy, to dismiss the

817
00:44:01,559 --> 00:44:05,360
quantum immortality concepts simply because it feels wrong, or because

818
00:44:05,400 --> 00:44:09,159
we just don't like the implications the idea of infinite decaying.

819
00:44:08,760 --> 00:44:10,599
Speaker 2: Selves, for instance, the gut reaction.

820
00:44:10,760 --> 00:44:12,760
Speaker 1: However, it's much harder to come up with a fully

821
00:44:12,840 --> 00:44:14,840
rigorous dismissal of it and hold on to the many

822
00:44:14,840 --> 00:44:20,239
worlds interpretations simultaneously. These gadank and experiments, these profound thought experiments,

823
00:44:20,239 --> 00:44:22,920
like quantum Russian Roulette, they help us to see where

824
00:44:22,960 --> 00:44:25,199
we need to do more work, where understanding hits the

825
00:44:25,280 --> 00:44:27,159
end of the road. They are tools for exposing the

826
00:44:27,199 --> 00:44:28,920
limits of our current knowledge and theories.

827
00:44:29,199 --> 00:44:32,039
Speaker 2: What's truly fascinating here is that even if we can't

828
00:44:32,039 --> 00:44:36,320
definitively prove or disprove quantum immortality in our own lifetime,

829
00:44:36,960 --> 00:44:40,360
the act of wrestling with the idea itself pushes the

830
00:44:40,360 --> 00:44:44,840
boundaries of our understanding of consciousness, identity, the universe.

831
00:44:45,000 --> 00:44:45,960
Speaker 1: Yeah, it's a.

832
00:44:45,840 --> 00:44:48,679
Speaker 2: Powerful tool for revealing the limits of our current knowledge,

833
00:44:48,880 --> 00:44:52,280
much like the black hole information paradox challenges our understanding

834
00:44:52,280 --> 00:44:56,599
of gravity and quantum mechanics. As our sources suggest, there

835
00:44:56,639 --> 00:44:59,199
is something profound in this idea, a lesson for us

836
00:44:59,239 --> 00:45:02,360
about who we really and the nature of reality, regardless

837
00:45:02,360 --> 00:45:04,159
of its ultimate scientific validity.

838
00:45:04,440 --> 00:45:07,159
Speaker 1: I have to admit, personally, even if MWI is true

839
00:45:07,719 --> 00:45:12,440
the Luisian idea of Strolbrog's immortality, this eternal torment is

840
00:45:12,559 --> 00:45:15,480
just really hard to swallow. It's not appealing, not at all.

841
00:45:15,880 --> 00:45:18,519
And beyond the discomfort, it still seems to run a

842
00:45:18,559 --> 00:45:20,119
foul of the fact that it would be much more

843
00:45:20,239 --> 00:45:22,519
likely that I would currently inhabit a much older state

844
00:45:22,559 --> 00:45:25,440
than my present one, given the infinite eons of suffering

845
00:45:25,480 --> 00:45:29,679
predicted by that mediocrity principal argument. It's a tough pill

846
00:45:29,679 --> 00:45:32,719
to take, both intuitively and probabilistically, but there.

847
00:45:32,599 --> 00:45:34,840
Speaker 2: Is perhaps a silver lining to all of this mind

848
00:45:34,880 --> 00:45:39,239
bending complexity, a truly profound and maybe even comforting thought.

849
00:45:39,639 --> 00:45:42,440
Even if we ultimately reject the strong claim of personal

850
00:45:42,480 --> 00:45:46,000
immortality and the thorny issue of who you truly is

851
00:45:46,360 --> 00:45:47,559
across all these.

852
00:45:47,360 --> 00:45:49,519
Speaker 1: Branches, Okay, I'm ready for some comfort.

853
00:45:50,119 --> 00:45:53,559
Speaker 2: As Peter Lewis, another philosopher, suggests, even if the you

854
00:45:53,760 --> 00:45:57,119
that survives in another branch is technically a distinct individual,

855
00:45:57,800 --> 00:46:02,239
MWI still offers a profound thought. At any future time,

856
00:46:02,360 --> 00:46:04,800
there is a branch containing a living successor of you,

857
00:46:05,559 --> 00:46:07,480
someone who carries on from where you left off.

858
00:46:07,519 --> 00:46:08,920
Speaker 1: In some sense, imagine that.

859
00:46:09,519 --> 00:46:12,119
Speaker 2: This means that in other branches of reality, whoever it

860
00:46:12,199 --> 00:46:14,679
might still be alive at ninety four may be surrounded

861
00:46:14,679 --> 00:46:19,199
by great grandchildren, a Nobel prize proudly displayed debating quantum

862
00:46:19,239 --> 00:46:22,280
immortality with David Lewis over a friendly game of chess

863
00:46:22,320 --> 00:46:24,360
in a world that never knew nuclear war.

864
00:46:24,599 --> 00:46:25,440
Speaker 1: It's a nice thought.

865
00:46:25,559 --> 00:46:27,960
Speaker 2: In these other branches, all of our hopes and dreams,

866
00:46:27,960 --> 00:46:31,320
transpiring aspirations for a better world, a happier life, where

867
00:46:31,639 --> 00:46:34,320
our loved ones lived longer, where history played out differently,

868
00:46:34,719 --> 00:46:35,920
do exist.

869
00:46:35,679 --> 00:46:38,000
Speaker 1: Somewhere in the multiverse. We might not be able to

870
00:46:38,119 --> 00:46:41,000
visit those island universes where we made different choices, or

871
00:46:41,000 --> 00:46:44,199
where events played out more favorably, but the profound and

872
00:46:44,280 --> 00:46:47,559
inspiring fact that they do exist at all proves to

873
00:46:47,639 --> 00:46:49,519
us that such dreams are realizable.

874
00:46:49,639 --> 00:46:51,559
Speaker 2: They're physically possible, and for.

875
00:46:51,559 --> 00:46:53,719
Speaker 1: Me, I think that can be a tremendous source of

876
00:46:53,760 --> 00:46:57,719
inspiration and comfort. Knowing that every best case scenario, every

877
00:46:57,719 --> 00:47:01,679
hopeful outcome is playing out someway in some branch of reality.

878
00:47:01,760 --> 00:47:02,239
Speaker 2: Wow.

879
00:47:03,039 --> 00:47:06,079
Speaker 1: From the baffling double sled experiment that just shatters our

880
00:47:06,119 --> 00:47:10,320
common sense, to the radical concept of a branching multiverse

881
00:47:10,719 --> 00:47:16,239
and the mind bending existential idea of quantum immortality, We've

882
00:47:16,239 --> 00:47:18,599
truly taken a deep dive today into some of the

883
00:47:18,639 --> 00:47:21,840
most profound questions at the intersection of physics and philosophy.

884
00:47:22,400 --> 00:47:26,320
There's been a journey that has challenged our understanding of reality, probability,

885
00:47:26,480 --> 00:47:27,480
and identity itself.

886
00:47:27,519 --> 00:47:30,440
Speaker 2: It really has. We've explored how a theory describing the

887
00:47:30,480 --> 00:47:34,159
tiniest particles might completely reshape our understanding of life, death,

888
00:47:34,199 --> 00:47:37,280
and even the very nature of self. And it leaves us,

889
00:47:37,280 --> 00:47:40,039
as these deep dives often do, with far more questions

890
00:47:40,079 --> 00:47:43,000
than easy answers. And this leads to a final provocative

891
00:47:43,039 --> 00:47:46,800
thought for you, the listener. If asm WI suggests countless

892
00:47:46,880 --> 00:47:50,079
versions of your life are continually unfolding across the multiverse

893
00:47:50,360 --> 00:47:54,920
and all possibilities are realized, how does that perspective influence

894
00:47:54,960 --> 00:47:57,599
the choices you make in this particular branch. Does it

895
00:47:57,599 --> 00:48:01,000
make your actions here feel more significant, or perhaps strangely

896
00:48:01,559 --> 00:48:02,480
less significant.

897
00:48:03,119 --> 00:48:07,480
Speaker 1: Knowing everything happens somewhere. Does this life matter more or less.

898
00:48:07,679 --> 00:48:09,599
Speaker 2: It's a question that makes us ponder the weight of

899
00:48:09,639 --> 00:48:12,440
our own existence in a universe far larger and stranger

900
00:48:12,480 --> 00:48:13,719
than we can fully comprehend.

901
00:48:14,039 --> 00:48:17,159
Speaker 1: A truly thought provoking deep dive. Thank you for joining

902
00:48:17,239 --> 00:48:19,760
us on this mind bending journey into the quantum realm

903
00:48:19,800 --> 00:48:23,480
and beyond. Until next time, stay thoughtful, stay curious.

904
00:48:23,039 --> 00:48:24,480
Speaker 2: And maybe listen for those clicks.

905
00:48:24,719 --> 00:48:27,280
Speaker 1: Huh maybe stay curious. Everyone,