00:00You literally cannot die. No, I'm not selling you a supplement. No, this isn't a cult.
00:04This is actual quantum physics, and it's either the most comforting idea in human history or the
00:10most terrifying. Today we're talking about quantum immortality. The idea that somewhere in the
00:15multiverse a version of you survives everything. Car crash survived. Global pandemic survived.
00:21Eating gas station sushi at 2 a.m. survived. Stay with me, it gets weird fast.
00:28Before we get to immortality, we need to talk about the many words interpretation of quantum
00:33mechanics. Don't run, I promise this takes 30 seconds. The level of electrons and tiny particles,
00:39things don't have a fixed state until you observe them. Particle can be spinning two ways at once.
00:47When you measure it, you get one answer. The old explanation of other possibilities just vanish.
00:52In 1957, a Princeton physicist named Hugh Everett III said, no, the other possibilities don't
00:58disappear. The universe splits. Both outcomes happen in different branches. Both real. Both continue
01:05forever. So right now, there's a branch where you turn this video off at the thumbnail. A branch there
01:11you already subscribe. A branch where you're watching this from a submarine. And one there,
01:15for reasons nobody can explain, you're wearing a cowboy hat.
01:18So, Everett believed his own theory so hard, he apparently never stated it publicly. But biographer
01:23Bourne documents that Everett privately believed this meant he could never truly die. He took that
01:28belief to his grave at age 51. Which is, again, kind of ironic.
01:35The physicist community largely ignored him for decades. But the idea never died. And in 1998,
01:41an MIT physicist named Mark Stegma made it famous in the most uncomfortable way possible.
01:49Tegma published a thought experiment called quantum suicide. He has a PhD from MIT. He's allowed to
01:55think about this. You're not allowed to try it. We clear? Good. This setup. A device connected to a
02:01quantum event like radioactive decay. 50% chance it kills you instantly. 50% chance nothing happens.
02:08You press the button. In a single world universe, real 50% chance you die. Tragic. Don't do this. In
02:15a
02:15many worlds universe, the universe splits. Branch A, you're fine. Branch B, you're cool. But branch B,
02:22you have zero experiences. No white light, no heaven, nothing. Just stop. So from your subjective
02:28point of view, you can only ever experience the surviving branch. Because that's the only branch there
02:34you exist to have any perceptions at all. Press the button again. Again. A thousand times. From
02:40inside your experience, you always survive. Tegma wrote, since there is exactly one observer having
02:45perceptions both before and after the trigger event, the MWI prediction is that he will hear
02:51click with 100% certainty. And it's not just guns. Any cause of death works the same way. There's always
02:57some tiny branch where you narrowly survive. And that's the only branch you ever experience.
03:04In 2018, researcher Thornton published a peer-reviewed paper in the Journal of Evolution
03:09and Technology arguing that quantum immortality is actually the smallest version of a much bigger idea.
03:16Three types. Let's go fast. Type 1. Eternal Return. The universe is so vast and time is so infinite
03:22that everything eventually repeats. Your exact brain configuration must statistically
03:26recue. This idea goes back to Frederic Nietzsche, who built his world philosophy around it. Nietzsche
03:31was also going through a rough decay. Type 2. Big World Immortality. Even right now,
03:36the universe may be so large that copies of you exist in casually disconnected regions.
03:41Tegma estimates there is a near copy of you approximately 10 to the power of 10 to the power
03:46of 29 meters away. A number bigger than the total atoms in the observable universe. Somewhere out there,
03:52your copy is making slightly better life decisions. Or slightly worse. Per math, we can't know.
03:58Quantum Immortality. Everett plus Tegmaq. You know this one. All three say the same thing. You never
04:03experience your own death. The key condition, per torsion, the universe must be genuinely huge,
04:08and personal identity must be copy-friendly.
04:13Okay, you are thinking. Sick, I am immortal. Time to skip the seatbelt. I need you to meet what
04:18philosopher Istvan Aranyoshe thinks. He is the nightmare. Multiverse immortality doesn't guarantee
04:23you survive well. It guarantees you survive somehow. The probability of surviving a near-death experience
04:29in perfect health is way lower than surviving it endured. So in the most statistically likely timelines,
04:35you survive, but barely. David Lewis described this as a terrifying culinary, that we should expect to
04:40live forever in a crippled, more and more damaged state, that barely sustains life. Aranyoshe called
04:45it eternal quantum torment. Which, by the way, is one of the greatest academic paper titles of all time.
04:52Torchion adds one more horror. As your normal survivor, timelines get more improbable. Increasingly
04:57weird scenarios dominate. Echo-style AI keeping you alive. Being a brain in a jar. Waking up in a simulation.
05:04He actually references Harlan Ellison's classic sci-fi story as a quantum immortality
05:09worst case. And he is completely explicit about it. Torchion is also explicit. Suicide is the worst
05:14possible response. If quantum immortality is real, attempted suicide results not in death,
05:19but in injury and continued suffering. Let's hear the haters. Jack Mala, physicist,
05:26wrote a paper calling this dangerous pseudoscience. Not subtle at all. His core argument. The total amount of
05:32view across all branches get cut in half every time. Consciousness can teleport from dying branches
05:38into surviving ones. The survivors aren't enriched by the deaths. The overall units of the universe just
05:44went down. Then there's mathematician Philip Wilson of Canterbury, who asked, what of the universe
05:50runs on strictly computable mathematical rules? His result? The standard argument breaks down. He then
05:56constructs a new version that works anyway. He debunked it and undebunked it simultaneously in the same paper.
06:05He is there, Torchion gets practical. He gives quantum immortality roughly 50-50 odds. The default
06:11outcome is bad, but you can influence which branch you experience. The immortality roadmap. Plan A.
06:17Stay alive long enough for anti-aging tech to arrive. Longevity researcher Aubrey de Grey calls this
06:23longevity escape velocity. Even until science extends your life faster than you are aging.
06:29Plan B. Cryonics. Get frozen after death. Companies like Alcor exist right now. Normal odds? Maybe 1%.
06:37Plan C. Digital immortality. Leave enough digital traces that a future AI could reconstruct your mind.
06:43Russian philosopher Nikolai Fedorov in the 1800s called this humanity common task
06:48The resurrection of all the dead. Either the most beautiful idea you've ever heard,
06:53or deeply unsettling. Possibly both. Plan D. Quantum immortality itself. The ultimate backup.
07:00Torchion also addresses euthanasia here, arguing it becomes counterproductive under QI. His alternative?
07:06Cryotanasia. Voluntary cryopreservation. Instead of death. Your backup, backup, plan.
07:13So here's where we land. Quantum immortality is a real theoretical idea. Is it true? Nobody knows.
07:20Torchion gives it 50-50. Is it good if it's true? Depends entirely on whether you signed up for cryonics.
07:27Here's what messed me up writing this. The main argument against worrying about quantum immortality
07:33is that it untestable from the outside. The main argument for worrying is that you are inside.
07:38Subscribe if you want to leave. Statistically you're going to anyway. That's all for now. Bye.
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