1 00:00:00,160 --> 00:00:03,799 Speaker 1: Welcome to thrilling threads, where we pull on the most fascinating, 2 00:00:03,919 --> 00:00:07,679 most frustrating, and well often terrifying ideas that make up 3 00:00:07,679 --> 00:00:12,320 our reality. Today. We're starting with something that really just 4 00:00:12,519 --> 00:00:15,599 pulls the rug out from under everything you assume about 5 00:00:15,640 --> 00:00:16,079 the world. 6 00:00:16,280 --> 00:00:20,320 Speaker 2: It really does. That premise is the comfortable predictability of 7 00:00:20,359 --> 00:00:24,320 classical physics. If you listening right now, feel safe because 8 00:00:24,359 --> 00:00:26,559 you know that when you drop your pen, it'll always fall, 9 00:00:27,000 --> 00:00:30,920 or when you push something it obeys Newton's loss. Get 10 00:00:30,960 --> 00:00:33,920 ready for that safety blanket to be completely shredded. 11 00:00:34,000 --> 00:00:37,600 Speaker 1: Absolutely. I mean, think about our normal, everyday reality. It's solid, 12 00:00:37,600 --> 00:00:39,439 it's logical. If I toss my keys in the air 13 00:00:39,520 --> 00:00:42,119 right now, I know they're coming back down. Newton guarantees 14 00:00:42,119 --> 00:00:45,240 that the math gives us one single, undeniable answer. But 15 00:00:45,359 --> 00:00:48,799 what if what if that wasn't true? What if you 16 00:00:48,880 --> 00:00:52,320 toss those keys and they just jiggled left in mid air, 17 00:00:52,759 --> 00:00:55,079 or and this is the really terrifying part, what if 18 00:00:55,079 --> 00:00:56,320 they just didn't come down at all. 19 00:00:56,560 --> 00:01:00,479 Speaker 2: That chaos you're describing, that's the strange, almost an archic 20 00:01:00,520 --> 00:01:03,960 reality of quantum mechanics. It doesn't just offer a different 21 00:01:04,000 --> 00:01:08,159 set of rules, It fundamentally shatters our understanding of reality itself. 22 00:01:08,840 --> 00:01:12,640 It replaces certainty with probability. 23 00:01:12,879 --> 00:01:16,200 Speaker 1: And what's so fascinating to me, so humanizing, is how 24 00:01:16,239 --> 00:01:19,319 hard the greatest minds in physics fought against it. 25 00:01:19,400 --> 00:01:21,040 Speaker 2: Oh, they hated it, they really did. It was a 26 00:01:21,040 --> 00:01:23,519 philosophical barrier for them, not just a technical one. 27 00:01:23,599 --> 00:01:26,359 Speaker 1: You see it everywhere. I love that quote from Richard Feynman, 28 00:01:26,480 --> 00:01:28,640 you know, one of the masters of this stuff. He said, 29 00:01:29,040 --> 00:01:32,319 I think I can safely say that nobody understands quantum mechanics. 30 00:01:33,480 --> 00:01:35,680 I mean, if he admits defeat, what chance to the 31 00:01:35,760 --> 00:01:36,439 rest of us haves? 32 00:01:36,480 --> 00:01:38,680 Speaker 2: And that struggle goes all the way to the top. 33 00:01:38,719 --> 00:01:41,840 To Albert Einstein, his famous line God does not play 34 00:01:41,879 --> 00:01:45,519 dice with the universe wasn't just some throwaway comment. It 35 00:01:45,599 --> 00:01:48,359 was a deep, deep conviction that there had to be 36 00:01:48,400 --> 00:01:52,040 some underlying order, some deterministic rules we just hadn't found. 37 00:01:51,879 --> 00:01:55,280 Speaker 1: Yet, right, something that would restore that sense of clarity 38 00:01:55,280 --> 00:01:57,799 and logic. But here's the thing we have to get 39 00:01:57,840 --> 00:02:01,280 straight right from the beginning. These quantum paradoxes aren't just 40 00:02:01,400 --> 00:02:04,719 clever word games, like Zeno's paradox about the arrow never 41 00:02:04,760 --> 00:02:05,599 reaching its target. 42 00:02:05,719 --> 00:02:09,680 Speaker 2: No, not at all. They are fundamentally, verifiably baked into 43 00:02:09,759 --> 00:02:14,680 the universe. They're real. They are mathematically precise phenomena that 44 00:02:14,840 --> 00:02:17,479 govern how everything works at the smallest scales. 45 00:02:17,960 --> 00:02:21,039 Speaker 1: So our mission today on Thrilling Threads is to navigate 46 00:02:21,080 --> 00:02:25,199 these paradoxes. We're going from you know how observation changes reality, 47 00:02:25,240 --> 00:02:29,240 to particles linked across the cosmos, and even the splitting 48 00:02:29,280 --> 00:02:30,319 of reality itself. 49 00:02:30,400 --> 00:02:32,719 Speaker 2: We're looking for those moments that explain why the quantum 50 00:02:32,759 --> 00:02:35,680 world has to exist on its own terms, completely separate 51 00:02:35,680 --> 00:02:37,479 from our neat classical expectations. 52 00:02:37,759 --> 00:02:42,479 Speaker 1: That feeling, that loss of control over a predictable system, 53 00:02:42,680 --> 00:02:45,759 it's so visceral. I remember once I was trying to 54 00:02:45,919 --> 00:02:48,240 program this complex lighting set up in my house. So it 55 00:02:48,280 --> 00:02:50,360 was supposed to be simple, right, if the sunsets turn 56 00:02:50,400 --> 00:02:52,680 on light A, if it's cloudy, turn on late B instead. 57 00:02:52,879 --> 00:02:56,560 I check the code. Everything was perfect, deterministic, but randomly, 58 00:02:56,680 --> 00:02:58,199 for no reason I could find, it would turn on 59 00:02:58,199 --> 00:03:00,960 the lawn sprinklers instead. Oh wow, and I just had 60 00:03:00,960 --> 00:03:03,080 this feeling of betrayal. Why did the system do Z 61 00:03:03,199 --> 00:03:05,879 when the rule is guaranteed? That collapse of certainty, that's 62 00:03:05,879 --> 00:03:08,759 the doorway into the quantum world. Except the system we're 63 00:03:08,759 --> 00:03:10,400 talking about is the universe. 64 00:03:10,080 --> 00:03:13,120 Speaker 2: Itself, and that randomness is exactly what we have to confront. 65 00:03:13,800 --> 00:03:16,280 So let's step through that doorway now and start with 66 00:03:16,319 --> 00:03:20,759 the one concept that gives physicists nightmares. Superposition. 67 00:03:20,879 --> 00:03:26,199 Speaker 1: Okay, let's unpack this superposition. It's this mind bending idea 68 00:03:26,960 --> 00:03:29,960 that a tiny particle like an electron can be in 69 00:03:30,039 --> 00:03:33,599 multiple conflicting states at the same time. So, for example, 70 00:03:33,800 --> 00:03:36,599 it can be spinning up and spinning down simultaneously. It's 71 00:03:36,639 --> 00:03:38,280 not just that we don't know which it is, it's 72 00:03:38,319 --> 00:03:40,000 genuinely both, and we. 73 00:03:40,039 --> 00:03:43,840 Speaker 2: Have to stress that state of multiple possibilities. That's the 74 00:03:43,919 --> 00:03:46,960 natural state of the particle. It's only when we interfere, 75 00:03:47,479 --> 00:03:51,360 when we observe or measure it, that anything changes. This duality, 76 00:03:51,400 --> 00:03:55,039 This wave of possibilities persists right up until you look. 77 00:03:55,120 --> 00:03:57,520 And then what happens the moment you look, the moment 78 00:03:57,560 --> 00:04:01,080 a detector interacts with it, that whole wave of possibilities 79 00:04:01,159 --> 00:04:04,280 will call the wave function. It instantly collapses. It collapses 80 00:04:04,319 --> 00:04:08,280 into one single, definite outcome. Only then do you know 81 00:04:08,360 --> 00:04:10,400 for sure if it was spin up or spin down. 82 00:04:10,520 --> 00:04:13,360 Speaker 1: That just feels so alien. In our world, you flip 83 00:04:13,400 --> 00:04:15,439 a coin and while it's spinning, we know it's going 84 00:04:15,439 --> 00:04:17,959 to be heads or tails. The outcome is determined. We 85 00:04:18,040 --> 00:04:20,720 just don't know which yet. The quantum world says no, 86 00:04:21,000 --> 00:04:24,600 it is literally fifty percent heads and fifty percent pails 87 00:04:24,680 --> 00:04:26,199 until you force it to choose. 88 00:04:27,519 --> 00:04:29,319 Speaker 2: Wait, how can we be so sure it's really in 89 00:04:29,319 --> 00:04:31,480 both states? Maybe it's just switching back and forth really 90 00:04:31,519 --> 00:04:35,279 really fast. That's the key question, and a great one. 91 00:04:35,399 --> 00:04:38,680 If it were just switching, we could theoretically measure that 92 00:04:38,720 --> 00:04:43,000 switching rate. But the experiments confirm again and again that 93 00:04:43,040 --> 00:04:46,319 the particles, wave properties, its ability to interfere with itself 94 00:04:46,680 --> 00:04:49,560 only exist when it's not being measured. The mass just 95 00:04:49,680 --> 00:04:53,399 demands that these states coexist until that collapse happens. 96 00:04:53,519 --> 00:04:57,240 Speaker 1: And this is where the brilliant physicist Irwin Schrodinger comes in. 97 00:04:57,680 --> 00:05:00,839 But his goal wasn't to celebrate this idea, was it. 98 00:05:00,839 --> 00:05:02,839 It was almost the opposite exactly. 99 00:05:03,120 --> 00:05:05,639 Speaker 2: He wanted to show how utterly ridiculous it becomes when 100 00:05:05,680 --> 00:05:09,480 you try to apply this logic to the big macroscopic world. 101 00:05:09,600 --> 00:05:12,240 And that's the origin of probably the most famous thought 102 00:05:12,279 --> 00:05:14,639 experiment in history, Schrodinger's. 103 00:05:14,120 --> 00:05:17,800 Speaker 1: Cat the ultimate illustration of quantum absurdity. So let's walk 104 00:05:17,800 --> 00:05:19,800 through the setup. You see a cat in a box 105 00:05:19,839 --> 00:05:21,240 you can't see into, right, And. 106 00:05:21,240 --> 00:05:23,959 Speaker 2: Inside that box there's a tiny mechanism. It's a single 107 00:05:24,040 --> 00:05:28,079 radioactive atom. That's our quantum trigger. So that atom exists 108 00:05:28,079 --> 00:05:30,480 in superposition. It is both decayed and not decayed at 109 00:05:30,519 --> 00:05:31,000 the same time. 110 00:05:31,079 --> 00:05:33,800 Speaker 1: Okay, So if the atom decays, it triggers a Geiger counter, 111 00:05:33,839 --> 00:05:36,560 which releases a hammer that smashes a vial of poison, 112 00:05:36,600 --> 00:05:37,680 and the cat dies. 113 00:05:37,959 --> 00:05:41,399 Speaker 2: But if the atom doesn't decay, nothing happens. The cat 114 00:05:41,480 --> 00:05:44,759 is perfectly fine. The cat's fate a life or dead, 115 00:05:45,079 --> 00:05:48,240 is completely tied to the quantum state of that one atom. 116 00:05:48,920 --> 00:05:51,600 Speaker 1: So now if we apply the rules of quantum mechanics 117 00:05:51,639 --> 00:05:56,480 we just talked about, the paradox becomes just terrifying. 118 00:05:56,639 --> 00:06:00,240 Speaker 2: Because the atom is in a superposition of decayed and 119 00:06:00,279 --> 00:06:04,560 not decate. The macroscopic cat, whose steed depends entirely on 120 00:06:04,600 --> 00:06:06,920 the atom, must also be in a superposition. 121 00:06:07,480 --> 00:06:09,439 Speaker 1: So before we open the box to check, the poor 122 00:06:09,480 --> 00:06:12,680 cat is genuinely both alive and not alive at the 123 00:06:12,720 --> 00:06:15,560 same time. I mean, that just tears a hole through reality. 124 00:06:15,600 --> 00:06:16,959 You can't be a little bit dead. 125 00:06:17,079 --> 00:06:19,839 Speaker 2: And that's the punchline. That's what Schrodinger was getting at. 126 00:06:20,079 --> 00:06:22,279 He wasn't seriously suggesting this could happen. The whole thing 127 00:06:22,319 --> 00:06:25,480 was a mockery, a powerful argument to show the absurdity 128 00:06:25,480 --> 00:06:29,319 of applying these microscopic quantum rules to everyday objects like 129 00:06:29,360 --> 00:06:30,160 cats and poison. 130 00:06:30,319 --> 00:06:32,920 Speaker 1: So his real argument was, look, if my theory means 131 00:06:32,920 --> 00:06:35,399 a cat can be both alive and dead, then there's 132 00:06:35,399 --> 00:06:37,959 something wrong or incomplete with our understanding of it. 133 00:06:38,000 --> 00:06:41,079 Speaker 2: Precisely, he was highlighting the boundary problem. Where does the 134 00:06:41,079 --> 00:06:44,279 weird quantum world stop and our normal classical world begin. 135 00:06:44,480 --> 00:06:46,240 Speaker 1: That's a great way to put it. The problem isn't 136 00:06:46,240 --> 00:06:49,279 the zombie cat. The problem is the boundary. Why does 137 00:06:49,279 --> 00:06:51,800 a single atom need an observer to pick a state, 138 00:06:52,319 --> 00:06:55,360 but a giant Geiger counter, which is made of billions 139 00:06:55,360 --> 00:06:59,439 of atoms, seems to be a reliable classical observer itself. 140 00:06:59,600 --> 00:07:02,079 Speaker 2: Yes, the takeaway isn't that we live in a universe 141 00:07:02,120 --> 00:07:05,040 of zombie cats. It's that the logic of the quantum 142 00:07:05,040 --> 00:07:08,319 world is fundamentally separate. We have to stop trying to 143 00:07:08,360 --> 00:07:11,399 cram it into our neat deterministic boxes. We just have 144 00:07:11,480 --> 00:07:13,279 to accept it as its own kind of weird. 145 00:07:13,680 --> 00:07:16,560 Speaker 1: But that leaves us with this really unnerving question, doesn't it. 146 00:07:16,600 --> 00:07:19,319 If reality only becomes definite when we look at it, 147 00:07:19,759 --> 00:07:22,240 what or who is actually making the decision? 148 00:07:22,759 --> 00:07:24,879 Speaker 2: Is it the device? Is it the light bouncing off 149 00:07:24,920 --> 00:07:27,920 the particle? Is it a conscious mind? That ambiguity is 150 00:07:27,959 --> 00:07:30,600 what haunted Einstein, and it leads us directly to the 151 00:07:30,639 --> 00:07:35,480 next terrifying paradox he helped create one about instantaneous connections 152 00:07:35,519 --> 00:07:37,000 across the entire universe. 153 00:07:37,160 --> 00:07:38,279 Speaker 1: We're talking about entanglement. 154 00:07:38,439 --> 00:07:39,560 Speaker 2: We're talking about entanglement. 155 00:07:39,720 --> 00:07:41,959 Speaker 1: Okay, so now we're moving from one particle being in 156 00:07:42,000 --> 00:07:45,279 two places to two particles being instantly linked no matter 157 00:07:45,279 --> 00:07:49,480 how far apart they are, entangled particles, cosmic links. This 158 00:07:49,519 --> 00:07:51,639 one always felt to me like the biggest violation of 159 00:07:51,759 --> 00:07:53,120 just common sense. 160 00:07:53,319 --> 00:07:56,839 Speaker 2: It is because it violates two core principles we rely 161 00:07:56,959 --> 00:07:59,720 on to make sense of the universe. Let's set it up. 162 00:08:00,279 --> 00:08:02,839 Entanglement happens when you create two particles, let's call them 163 00:08:02,879 --> 00:08:06,040 A and B together in a single shared quantum state. 164 00:08:06,639 --> 00:08:10,240 And the crucial part is their properties are linked. But inversely, 165 00:08:10,680 --> 00:08:14,600 if A has one property, B must instantly have the opposite. 166 00:08:14,759 --> 00:08:17,199 Speaker 1: Okay, so let's stick with spin until we measure them. 167 00:08:17,240 --> 00:08:19,959 Both particle A and particle B are in superposition. They're 168 00:08:20,000 --> 00:08:23,120 both spin up and spin down, but they're correlated. It's 169 00:08:23,160 --> 00:08:25,240 like having a magical pair of socks. If I pull 170 00:08:25,279 --> 00:08:27,439 out the left sock here, I instantly know the other 171 00:08:27,480 --> 00:08:29,600 one is the right sock, even if it's miles away. 172 00:08:29,879 --> 00:08:32,440 Speaker 2: That's a great analogy, but with a critical quantum twist 173 00:08:33,159 --> 00:08:35,639 in your sock drawer. The socks were always a left 174 00:08:35,639 --> 00:08:39,039 and a right. They were predetermined in the quantum world. 175 00:08:39,360 --> 00:08:41,960 Neither particle has a definite state until you measure the 176 00:08:42,000 --> 00:08:44,879 first one. They only exist as a cloud of probability. 177 00:08:45,039 --> 00:08:48,399 Speaker 1: Okay, so here's the part that drew Einstein crazy. We 178 00:08:48,519 --> 00:08:51,960 let these two particles fly light years apart. Particle A 179 00:08:52,159 --> 00:08:54,799 stays here on Earth and particle B goes all the 180 00:08:54,799 --> 00:08:57,039 way to the Andromeda galaxy two and a half million 181 00:08:57,120 --> 00:09:00,360 light years away. The second I measure a part A 182 00:09:00,480 --> 00:09:03,440 here on Earth and find its spin up particle B 183 00:09:03,840 --> 00:09:07,519 light years away, and Andromeda instantly collapses into spin down. 184 00:09:07,600 --> 00:09:11,440 Speaker 2: That instantaneous correlation, that's what Einstein called spooky action at 185 00:09:11,480 --> 00:09:14,919 a distance. For him, it wasn't just spooky, it was impossible. 186 00:09:15,279 --> 00:09:18,759 It seemed to shatter two foundational principles of reality as 187 00:09:18,799 --> 00:09:19,320 he saw it. 188 00:09:19,440 --> 00:09:21,679 Speaker 1: Okay, so what were they. Let's break down why this 189 00:09:21,840 --> 00:09:23,639 was such a big deal for a classical mind. 190 00:09:23,759 --> 00:09:27,360 Speaker 2: The first one was locality. Locality is just the idea 191 00:09:27,399 --> 00:09:30,200 that things can only be influenced by their immediate surroundings. 192 00:09:30,600 --> 00:09:33,360 Cause and effect have to travel through space, and nothing, 193 00:09:33,519 --> 00:09:35,960 absolutely nothing can travel faster than the speed of light. 194 00:09:36,559 --> 00:09:40,240 This instantaneous link between Earth and Andromeda seemed to require 195 00:09:40,279 --> 00:09:41,919 some kind of faster than light's signals. 196 00:09:41,960 --> 00:09:44,480 Speaker 1: And the second principle was reality itself. 197 00:09:44,679 --> 00:09:48,840 Speaker 2: Basically, yes, what he called reality. Einstein believed that objects 198 00:09:48,840 --> 00:09:51,360 have definite properties that exist whether we're looking at them 199 00:09:51,440 --> 00:09:54,320 or not. The moon has a mass and a location 200 00:09:54,519 --> 00:09:57,399 even when you're not looking at it. But with entanglement 201 00:09:57,720 --> 00:10:01,600 the property the spin only becomes real after you measure it, 202 00:10:01,960 --> 00:10:06,240 which suggests the active observation here somehow creates reality over 203 00:10:06,279 --> 00:10:07,320 there instantly. 204 00:10:07,600 --> 00:10:10,120 Speaker 1: That's the spooky part. Your measurement in this room makes 205 00:10:10,120 --> 00:10:13,000 Steve's particle and Andromeda snap into a state. But wait 206 00:10:13,080 --> 00:10:15,440 a minute, If the change is instantaneous, why can't we 207 00:10:15,519 --> 00:10:18,120 use this to send messages faster than light, like send 208 00:10:18,120 --> 00:10:19,480 Morse code to Andromeda. 209 00:10:19,600 --> 00:10:23,320 Speaker 2: Ah, that's the brilliant, subtle catch that saves relativity. You 210 00:10:23,360 --> 00:10:26,080 can't because the result of your measurement on particle A 211 00:10:26,320 --> 00:10:28,960 is completely random. You can't force it to be spin 212 00:10:29,080 --> 00:10:30,720 up to send a one, or spin down to send 213 00:10:30,759 --> 00:10:33,960 a zero. You only know that whatever random result you get, 214 00:10:34,159 --> 00:10:36,600 particle B will be the opposite. There's no way to 215 00:10:36,679 --> 00:10:40,440 encode information into it. The weirdness remains, but the cosmic 216 00:10:40,440 --> 00:10:42,360 speed limit for communication is safe. 217 00:10:42,519 --> 00:10:46,399 Speaker 1: Okay, thank goodness for that. But Einstein still hated the randomness, 218 00:10:46,440 --> 00:10:49,120 so he and a couple of colleagues, Podolski and Rosen, 219 00:10:49,320 --> 00:10:52,279 came up with an alternative, the EPR paradox. 220 00:10:52,399 --> 00:10:56,720 Speaker 2: Right. Their solution was that this spooky action just it 221 00:10:56,759 --> 00:10:59,840 couldn't be real. They argue, the only way to avoid 222 00:10:59,879 --> 00:11:02,720 it was if the particles already had their spin values 223 00:11:02,759 --> 00:11:05,919 determined from the very beginning when they were created. They 224 00:11:05,919 --> 00:11:08,639 were arguing for something called local hidden variables. 225 00:11:09,039 --> 00:11:11,919 Speaker 1: So back to the socks. The particles were never really 226 00:11:11,960 --> 00:11:14,720 in superposition. They were always up and down. We just 227 00:11:14,720 --> 00:11:16,200 didn't know which was which until. 228 00:11:15,960 --> 00:11:19,399 Speaker 2: We looked exactly they didn't know what these hidden variables were, 229 00:11:19,679 --> 00:11:22,679 but they said they must exist to save locality and reality. 230 00:11:22,960 --> 00:11:25,200 They thought they'd found a huge hole in quantum logic. 231 00:11:25,399 --> 00:11:29,879 And for decades this was just a philosophical debate, untestable. 232 00:11:29,360 --> 00:11:32,200 Speaker 1: Until a physicist named John Bell came along. This is 233 00:11:32,200 --> 00:11:36,559 where the terrifying philosophy gets slammed with hard experimental truth. 234 00:11:36,919 --> 00:11:39,600 Speaker 2: Bell was a genius. He figured out a way to 235 00:11:39,639 --> 00:11:44,879 turn this philosophical argument into a testable mathematical inequality Bell's theorem. 236 00:11:45,039 --> 00:11:47,279 Speaker 1: So what was the test? What were the stakes here? 237 00:11:47,480 --> 00:11:51,720 Speaker 2: The breakdown is revolutionary. He realized that if Einstein was right, 238 00:11:52,399 --> 00:11:56,360 if there were local hidden variables, then there's a mathematical 239 00:11:56,399 --> 00:11:59,320 limit on how strongly the measurements of the two particles 240 00:11:59,320 --> 00:12:03,159 could be correlated. He calculated that limit the Bell inequality. 241 00:12:03,320 --> 00:12:06,159 Speaker 1: So it's a scientific dare. He's saying, go run the experiment. 242 00:12:06,519 --> 00:12:10,519 If reality is classical and local, like Einstein believed, your 243 00:12:10,559 --> 00:12:13,120 results have to be below this line. But if quantum 244 00:12:13,120 --> 00:12:16,159 mechanics is right, your results will be above this line. 245 00:12:16,159 --> 00:12:16,879 It's one or the other. 246 00:12:17,080 --> 00:12:19,480 Speaker 2: And of course the experiments were done again and again 247 00:12:19,559 --> 00:12:22,480 with more and more precision, closing all the loopholes, and 248 00:12:22,559 --> 00:12:26,000 the result was undeniable. The correlations were far stronger than 249 00:12:26,039 --> 00:12:29,919 any classical theory could ever allow. Quantum mechanics was proven correct. 250 00:12:30,080 --> 00:12:31,879 Speaker 1: So what does that mean? What do we have to 251 00:12:31,919 --> 00:12:32,360 throw out? 252 00:12:32,559 --> 00:12:34,919 Speaker 2: It means we have to throw out either locality or 253 00:12:34,960 --> 00:12:38,399 reality as we know them. Spooky action at a distance 254 00:12:38,480 --> 00:12:41,240 is real. It's not a bug, It's a feature of 255 00:12:41,279 --> 00:12:45,279 the universe. A particle's properties do not exist until measured, 256 00:12:45,639 --> 00:12:49,000 and that measurement instantly influences his partner no matter the distance. 257 00:12:49,600 --> 00:12:52,519 Einstein was applying the wrong rule book and the universe 258 00:12:52,559 --> 00:12:55,159 shows chaos over his preferred certainty. 259 00:12:55,440 --> 00:12:59,639 Speaker 1: Wow, that is genuinely profound. The universe is fundamentally non 260 00:12:59,679 --> 00:13:03,399 local and probabilistic, which brings us right back to observation. 261 00:13:03,559 --> 00:13:05,600 It seems to be the lynchpin that turns all this 262 00:13:05,720 --> 00:13:08,480 probability into our single, solid reality. 263 00:13:08,639 --> 00:13:11,320 Speaker 2: And if entanglement showed us that measurement is non local, 264 00:13:11,600 --> 00:13:14,879 the role of observation in actually creating reality is best 265 00:13:14,919 --> 00:13:18,200 shown by the most foundational experiment of all, the double 266 00:13:18,200 --> 00:13:19,000 slit experiment. 267 00:13:19,080 --> 00:13:20,759 Speaker 1: Okay, let's really spend some time on this, because the 268 00:13:20,759 --> 00:13:23,840 outcome just defines quantum weirdness. You have a barrier with 269 00:13:23,879 --> 00:13:26,919 two tiny slits in it, and you fire single photons 270 00:13:26,960 --> 00:13:28,759 particles of light at this barrier. 271 00:13:28,840 --> 00:13:31,440 Speaker 2: Classically, if you shoot little pellets like sand at a 272 00:13:31,440 --> 00:13:34,240 wall with two holes, you expect to see two distinct 273 00:13:34,240 --> 00:13:37,200 piles of sand build up right behind the holes. Simple 274 00:13:37,279 --> 00:13:38,159 particle behavior. 275 00:13:38,480 --> 00:13:41,600 Speaker 1: But when you run this experiment with photons and you 276 00:13:41,639 --> 00:13:44,559 don't watch which slit they go through, you get something 277 00:13:44,600 --> 00:13:47,320 completely different on the screen behind them. You don't get 278 00:13:47,360 --> 00:13:50,480 two bands of light, you get an interference pattern, lots 279 00:13:50,480 --> 00:13:51,879 of bright and dark stripes. 280 00:13:52,200 --> 00:13:55,879 Speaker 2: And that interference pattern is the unmistakable signature of a wave. 281 00:13:57,200 --> 00:14:00,000 It means that single photon isn't acting like a part 282 00:14:00,080 --> 00:14:03,080 article choosing one slit or the other. It's acting like 283 00:14:03,120 --> 00:14:06,000 a wave or a ghost going through both slits at 284 00:14:06,039 --> 00:14:08,200 the same time and then interfering with itself on the 285 00:14:08,240 --> 00:14:08,879 other side. 286 00:14:09,159 --> 00:14:11,759 Speaker 1: How is that even possible? How can one thing be 287 00:14:11,919 --> 00:14:13,200 in two places at once? 288 00:14:13,279 --> 00:14:15,080 Speaker 2: It's only impossible if you think of it as a 289 00:14:15,120 --> 00:14:19,399 tiny little ball. That's a wave of probability. But here's 290 00:14:19,399 --> 00:14:22,799 where it guess truly mind bending. We decide we want 291 00:14:22,799 --> 00:14:24,440 to know how it does this, so we put a 292 00:14:24,480 --> 00:14:26,639 tiny detector at the slits to see which path the 293 00:14:26,639 --> 00:14:27,799 photon actually takes. 294 00:14:27,879 --> 00:14:29,320 Speaker 1: We want to catch it in the act, so we 295 00:14:29,360 --> 00:14:32,399 fire it up again with the detector on, and what happens. 296 00:14:32,440 --> 00:14:36,600 Speaker 2: The interference pattern completely disappears gone. The photons instantly go 297 00:14:36,679 --> 00:14:39,600 back to behaving like particles. You get two distinct bands 298 00:14:39,600 --> 00:14:41,639 of light exactly where you'd expect them to be. 299 00:14:41,919 --> 00:14:45,840 Speaker 1: So the very act of checking of getting that information 300 00:14:46,679 --> 00:14:49,240 forces the particle to make a choice. It collapses the wave. 301 00:14:49,360 --> 00:14:52,080 Speaker 2: That's the rule. You can see the wave behavior or 302 00:14:52,080 --> 00:14:54,360 you can know the path information, but you can never 303 00:14:54,600 --> 00:14:58,080 ever have both at the same time. The particle's behavior 304 00:14:58,159 --> 00:15:03,440 changes because it feels aware of an observer. So to speak, 305 00:15:03,840 --> 00:15:07,399 Reality only feels solid because we're constantly looking at it. 306 00:15:07,440 --> 00:15:09,759 Speaker 1: That is just so unnerving. It's like being in a 307 00:15:09,799 --> 00:15:14,279 brainstorming meeting where everyone's throwing out ideas, keeping all possibilities open. 308 00:15:14,360 --> 00:15:17,039 That the moment the CEO walks in the room, everyone 309 00:15:17,120 --> 00:15:20,919 snaps to a single safe, approved position the highest level 310 00:15:20,919 --> 00:15:23,320 of observation collapses all the other possibilities. 311 00:15:23,480 --> 00:15:26,240 Speaker 2: That is a perfect analogy for how a quantum system behaves, 312 00:15:26,639 --> 00:15:29,600 and that idea that checking dictates reality brings us to 313 00:15:29,639 --> 00:15:32,639 a really interesting real world parallel. The source material brought 314 00:15:32,720 --> 00:15:33,159 up right. 315 00:15:33,480 --> 00:15:36,600 Speaker 1: If the universe can force a collapse on a particle's identity, 316 00:15:37,000 --> 00:15:40,080 what happens when unseen systems do that to our identity. 317 00:15:40,279 --> 00:15:44,039 Speaker 2: We're talking about the huge invisible industry of data brokers. 318 00:15:44,200 --> 00:15:44,399 Speaker 1: Yeah. 319 00:15:44,440 --> 00:15:47,679 Speaker 2: They are like invisible observers, constantly detecting little fragments of 320 00:15:47,720 --> 00:15:50,639 your life, where you shop, what you earn, your family, 321 00:15:50,720 --> 00:15:53,039 your health, struggles, all of it. 322 00:15:53,200 --> 00:15:56,120 Speaker 1: And they use those fragments to categorize you, to put 323 00:15:56,159 --> 00:15:59,279 you into these really invasive, sometimes disturbing boxes. The source 324 00:15:59,279 --> 00:16:04,000 mentioned labels like tough start, young single parents, or rural 325 00:16:04,080 --> 00:16:05,159 and barely making it. 326 00:16:05,240 --> 00:16:07,360 Speaker 2: And once you're in that box, you're no longer a 327 00:16:07,360 --> 00:16:12,240 person with infinite possibilities. You're a target with a deterministic label. 328 00:16:12,919 --> 00:16:16,159 It's like the system is forcing a wave function collapse 329 00:16:16,399 --> 00:16:19,360 on your personal identity, just like the detector does to 330 00:16:19,360 --> 00:16:19,879 the photon. 331 00:16:20,000 --> 00:16:23,039 Speaker 1: That's a powerful analogy. Before the algorithm sees your credit score, 332 00:16:23,279 --> 00:16:26,840 you exist as a superposition of consumer potential. The moment 333 00:16:26,840 --> 00:16:30,120 it measures and classifies you, that collapses. You're no longer 334 00:16:30,120 --> 00:16:33,080 just a person, your high risk borrower, and that label 335 00:16:33,159 --> 00:16:35,639 changes the ads you see, the opportunities you get. It's 336 00:16:35,639 --> 00:16:38,679 this non local, invisible force shaping your reality. 337 00:16:39,080 --> 00:16:41,559 Speaker 2: It is. But let's go back to the quantum world, 338 00:16:41,720 --> 00:16:44,600 because there's one more layer of this observation paradox to 339 00:16:44,639 --> 00:16:49,240 peel back the idea that you can change reality retroactively, 340 00:16:49,720 --> 00:16:50,879 the quantum eraser. 341 00:16:51,120 --> 00:16:53,960 Speaker 1: Okay, if looking change is the present, you're saying that 342 00:16:54,039 --> 00:16:56,879 erasing the knowledge after the fact can change the past. 343 00:16:57,120 --> 00:16:58,360 That sounds like science fiction. 344 00:16:58,919 --> 00:17:02,320 Speaker 2: It does, but it's a verified experimental result. It uses 345 00:17:02,360 --> 00:17:06,640 a more advanced double slit setup with entangled photon pairs 346 00:17:06,880 --> 00:17:08,200 photon A and photon B. 347 00:17:08,480 --> 00:17:11,079 Speaker 1: Photon A goes towards the slits and photon B is 348 00:17:11,160 --> 00:17:12,359 used to track its path. 349 00:17:12,279 --> 00:17:14,039 Speaker 2: Right, and as photon A goes to a slit, A 350 00:17:14,079 --> 00:17:16,880 device gives it a sort of barcode saying which slit 351 00:17:16,920 --> 00:17:20,039 it took. Because its partner, photon B, is entangled, it 352 00:17:20,079 --> 00:17:22,720 in instantly gets that path information too, even as it 353 00:17:22,759 --> 00:17:23,839 flies off somewhere else. 354 00:17:24,039 --> 00:17:26,359 Speaker 1: So if we look at Photona's data, we know the 355 00:17:26,400 --> 00:17:29,000 path information is available from its partner. So it acts 356 00:17:29,039 --> 00:17:32,039 like a particle two bands, no interference. 357 00:17:31,880 --> 00:17:35,839 Speaker 2: Exactly the potential to get the information destroys the interference. 358 00:17:36,759 --> 00:17:39,759 But here's the crazy part. We take photon B, the 359 00:17:39,799 --> 00:17:42,240 one carrying the knowledge, and we send it through a 360 00:17:42,279 --> 00:17:46,359 quantum erasure. This device scrambles the bar code. It makes 361 00:17:46,400 --> 00:17:49,680 it fundamentally impossible to ever know which slit Photon A took. 362 00:17:49,799 --> 00:17:52,720 Speaker 1: But wait, Photon A already hit the screen. It already 363 00:17:52,759 --> 00:17:55,160 finished its journey and was recorded as a particle. 364 00:17:55,279 --> 00:17:58,400 Speaker 2: I know. But when we go back and correlate photon 365 00:17:58,440 --> 00:18:01,319 a's data with the nawur race data from sotan B, 366 00:18:01,880 --> 00:18:06,000 the interference pattern magically reappears. It's as if destroying the 367 00:18:06,039 --> 00:18:09,079 knowledge in the present undid the observation in the past. 368 00:18:09,240 --> 00:18:11,519 Speaker 1: Hold on, you're telling me a measurement I made yesterday 369 00:18:11,559 --> 00:18:13,559 only became a collapse today when I looked at the 370 00:18:13,559 --> 00:18:15,839 path data, and when I erased that data today, the 371 00:18:15,880 --> 00:18:19,319 class was undone, retroactively changing how the particle behaved yesterday. 372 00:18:19,359 --> 00:18:21,400 Speaker 2: It suggests that quant of events aren't fixed in a 373 00:18:21,440 --> 00:18:24,880 simple linear timeline. The state of the entire system past 374 00:18:24,920 --> 00:18:28,680 and present is sort of negotiable until all the information 375 00:18:28,759 --> 00:18:31,640 is either confirmed or destroyed for good. It's like a 376 00:18:31,680 --> 00:18:34,119 detective story where a new piece of evidence makes you 377 00:18:34,200 --> 00:18:36,000 reinterpret everything that happened before. 378 00:18:36,240 --> 00:18:39,640 Speaker 1: So time itself isn't this fixed forward marching thing we 379 00:18:39,680 --> 00:18:44,000 think it is, Which leads us to the big boundary problem. 380 00:18:44,119 --> 00:18:48,079 If an observer causes the collapse, where does that collapse 381 00:18:48,119 --> 00:18:48,920 actually stop. 382 00:18:49,319 --> 00:18:52,200 Speaker 2: That's the question Eugene Wigner tackled with his famous thought 383 00:18:52,200 --> 00:18:56,039 experiment Wigner's Friend. It's a direct challenge to the idea 384 00:18:56,079 --> 00:18:57,000 of objective truth. 385 00:18:57,119 --> 00:18:59,960 Speaker 1: Okay, let's picture this. There are two observers, let's call 386 00:19:00,079 --> 00:19:03,440 them Steve and us. The narrator. Steve is inside a 387 00:19:03,440 --> 00:19:06,400 completely sealed lab. He's measuring the spin of a particle. 388 00:19:06,720 --> 00:19:09,319 He measures it, finds it's up, and he writes that 389 00:19:09,359 --> 00:19:10,240 down in his notebook. 390 00:19:10,279 --> 00:19:13,519 Speaker 2: To Steve inside the lab, reality has collapsed. It's one 391 00:19:13,559 --> 00:19:15,559 hundred percent definite yet result up. 392 00:19:15,599 --> 00:19:18,279 Speaker 1: But from my perspective outside the lab, I haven't looked yet. 393 00:19:18,799 --> 00:19:21,839 So according to the rules of quantum mechanics, the entire lab, Steve, 394 00:19:21,880 --> 00:19:25,079 the particle, the measuring device, his notebook is all one 395 00:19:25,200 --> 00:19:28,039 big quantum system that's still in superposition. 396 00:19:28,359 --> 00:19:32,519 Speaker 2: That's the conflict. Steve is certain of his reality up, 397 00:19:33,000 --> 00:19:35,279 but the outside observer sees the whole lab is an 398 00:19:35,279 --> 00:19:39,920 indefinite superposition of possibilities fifty percent Steve measured up plus 399 00:19:40,000 --> 00:19:43,480 fifty percent Steve measured down for the outside world. The 400 00:19:43,519 --> 00:19:46,519 collapse hasn't happened yet, not until I open the door 401 00:19:46,559 --> 00:19:46,880 and look. 402 00:19:47,200 --> 00:19:51,279 Speaker 1: So does that mean objective truth is relative? My reality 403 00:19:51,359 --> 00:19:55,000 isn't your reality until we compare notes. That is genuinely unsettling. 404 00:19:55,200 --> 00:19:57,960 Speaker 2: It is if a cat being alive and dead is weird. 405 00:19:58,519 --> 00:20:01,799 This asks us to consider a conscious friend being in 406 00:20:01,799 --> 00:20:04,480 a superposition of having seen up and down at the 407 00:20:04,480 --> 00:20:06,720 same time until we check on them. It makes the 408 00:20:06,799 --> 00:20:09,000 nature of observation deeply subjective. 409 00:20:09,160 --> 00:20:10,799 Speaker 1: It's like you and a friend watch a big game 410 00:20:10,839 --> 00:20:12,839 and the next day you're celebrating the win and they're 411 00:20:12,880 --> 00:20:16,240 mourning the loss because you somehow sow two completely different 412 00:20:16,359 --> 00:20:19,039 definite endings and you're both convinced you're right. 413 00:20:19,279 --> 00:20:22,599 Speaker 2: And yet this philosophical weirdness isn't just for thought experiments. 414 00:20:22,960 --> 00:20:27,759 It's the basis for real practical technology. If observation causes 415 00:20:27,799 --> 00:20:30,599 a collapse, what if we just observe constantly? That's the 416 00:20:30,640 --> 00:20:32,319 idea behind the quantum Zeno effect. 417 00:20:32,519 --> 00:20:35,039 Speaker 1: I love this one. The Zeno effect says that if 418 00:20:35,039 --> 00:20:37,920 you just keep measuring a quantum system over and over 419 00:20:38,039 --> 00:20:40,920 really fast, you can essentially freeze it in place. You 420 00:20:40,960 --> 00:20:42,960 stop it from evolving because you never give it a 421 00:20:43,039 --> 00:20:43,880 chance to change. 422 00:20:43,920 --> 00:20:46,880 Speaker 2: And this is incredibly useful for something like quantum computing, 423 00:20:46,880 --> 00:20:51,079 where the systems are extremely fragile. Imagine you have an 424 00:20:51,240 --> 00:20:54,960 unstable radioactive atom in your quantum computer. If you leave 425 00:20:55,000 --> 00:20:57,759 it alone, it'll decay and ruin your calculation. 426 00:20:58,039 --> 00:21:01,200 Speaker 1: But if you measure it every microsecond, that constant observation 427 00:21:01,559 --> 00:21:05,359 forces it to keep collapsing back into its initial stable state. 428 00:21:05,839 --> 00:21:09,240 You slow its decay down so much that it practically stops. 429 00:21:09,359 --> 00:21:12,680 Speaker 2: It's literally the watched pot that never boils made real. 430 00:21:13,160 --> 00:21:16,039 It's been verified in labs. We're using the fragility of 431 00:21:16,119 --> 00:21:17,720 quantum mechanics to make it stable. 432 00:21:18,000 --> 00:21:22,079 Speaker 1: That's incredible. And speaking of using quantum rules for counterintuitive things, 433 00:21:22,200 --> 00:21:25,079 let's talk about finding a bomb without touching it interaction 434 00:21:25,200 --> 00:21:25,920 free measurement. 435 00:21:26,079 --> 00:21:29,079 Speaker 2: This is pure quantum deduction. The goal is to detect 436 00:21:29,400 --> 00:21:32,119 a super sensitive bomb that will explode if even a 437 00:21:32,160 --> 00:21:35,079 single photon hits it. So we use a device called 438 00:21:35,079 --> 00:21:39,880 an interferometer, which splits a single photon's path using superposition. 439 00:21:40,119 --> 00:21:43,279 Speaker 1: Okay, so a single photon hits a beam splitter, it 440 00:21:43,319 --> 00:21:45,559 doesn't choose a path, It goes down both path A 441 00:21:45,759 --> 00:21:48,400 and path B at the same time, like a ghost right. 442 00:21:48,480 --> 00:21:51,599 Speaker 2: And then those two ghostly paths come back together at 443 00:21:51,599 --> 00:21:54,480 a second beam splitter, which directs the photon to one 444 00:21:54,480 --> 00:21:57,079 of two detectors, Detector C or detector D. 445 00:21:57,359 --> 00:22:02,920 Speaker 1: Okay scenario one, no bomb. The two ghostly paths travel uninterrupted. 446 00:22:03,240 --> 00:22:05,640 When they meet up again, they interfere with each other perfectly, 447 00:22:06,160 --> 00:22:08,839 and the setup is tuned so that this interference guarantees 448 00:22:08,880 --> 00:22:11,880 the photon always one hundred percent of the time hits 449 00:22:11,920 --> 00:22:14,359 detector D. Detector C never clicks. 450 00:22:14,440 --> 00:22:17,039 Speaker 2: No Stereo. Two. We put the bomb on path B. 451 00:22:17,440 --> 00:22:20,119 The bomb acts as an observer. It forces the photon 452 00:22:20,160 --> 00:22:22,440 to collapse and choose a path. If it chooses path B, 453 00:22:22,640 --> 00:22:24,440 the bomb goes off. That's a fifty percent risk. 454 00:22:24,519 --> 00:22:27,119 Speaker 1: But if it chooses the safe path A, the interference 455 00:22:27,160 --> 00:22:29,319 is now broken. The ghost on path B was blocked, 456 00:22:29,359 --> 00:22:31,680 so there's nothing for the ghost on PATHA to interfere with. 457 00:22:31,960 --> 00:22:35,920 Speaker 2: And without that perfect interference, the rules at the end change. 458 00:22:36,519 --> 00:22:39,480 Now the photon has a chance to go to detector C, 459 00:22:40,079 --> 00:22:43,200 and since detector c never clicks when the bomb is absent. 460 00:22:43,680 --> 00:22:46,640 If it clicks, we know two things for sure. One 461 00:22:46,759 --> 00:22:49,720 the bomb is there because the interference was broken, and 462 00:22:49,799 --> 00:22:52,799 two the photon took the safe path, so we're still alive. 463 00:22:52,920 --> 00:22:55,279 Speaker 1: We inferred the presence of the bomb from the absence 464 00:22:55,279 --> 00:22:59,000 of a predictable outcome. That is wow deduction on a 465 00:22:59,039 --> 00:22:59,920 cosmic scale. 466 00:23:00,000 --> 00:23:03,039 Speaker 2: It really is. The big insight is that sometimes the 467 00:23:03,119 --> 00:23:06,400 universe reveals itself not by what happens, but by what 468 00:23:06,480 --> 00:23:07,119 doesn't happen. 469 00:23:07,160 --> 00:23:10,200 Speaker 1: We've seen how these paradoxes break reality on the small scale, 470 00:23:10,440 --> 00:23:12,319 but what happens when we scale this up to the 471 00:23:12,359 --> 00:23:15,200 biggest things in the universe. We run straight into the 472 00:23:15,279 --> 00:23:18,680 ultimate conflict in physics, the black hole information paradox. 473 00:23:18,799 --> 00:23:22,000 Speaker 2: This is a genuine agonizing clash between our two master 474 00:23:22,119 --> 00:23:25,559 theories of the universe, general relativity, which describes gravity and 475 00:23:25,599 --> 00:23:29,039 black holes, and quantum mechanics, which describes particles. 476 00:23:29,279 --> 00:23:32,079 Speaker 1: According to general relativity, black holes are simple. All the 477 00:23:32,079 --> 00:23:34,680 complex information about what falls in a library of books 478 00:23:34,759 --> 00:23:38,759 a hard drive is just destroyed. All that's left is mass, spin, 479 00:23:38,880 --> 00:23:39,599 and charge. 480 00:23:39,680 --> 00:23:42,960 Speaker 2: It's called the no hair theorem. Black Holes have no 481 00:23:43,039 --> 00:23:46,599 other distinguishing features. The information is gone forever. 482 00:23:47,200 --> 00:23:52,000 Speaker 1: But quantum mechanics has this sacred, unbreakable rule. Information can 483 00:23:52,039 --> 00:23:55,559 never be destroyed. It must be conserved. If you know 484 00:23:55,640 --> 00:23:57,480 the state of a system now, you should be able 485 00:23:57,519 --> 00:24:01,599 to calculate its entire past. The information has to be somewhere, 486 00:24:02,079 --> 00:24:02,440 so you. 487 00:24:02,400 --> 00:24:06,480 Speaker 2: Have a paradox. General relativity says information is destroyed. Quantum 488 00:24:06,480 --> 00:24:09,759 mechanics says it's conserved. They can't both be right when 489 00:24:09,759 --> 00:24:10,880 it comes to black holes. 490 00:24:10,960 --> 00:24:14,119 Speaker 1: And this is where Stephen Hawking came in with Hawking radiation. 491 00:24:14,559 --> 00:24:17,279 He brought quantum mechanics to the black hole's edge right. 492 00:24:17,319 --> 00:24:20,240 Speaker 2: He realized that the vacuum of space is fizzing with 493 00:24:20,319 --> 00:24:24,640 pairs of virtual particles that pop into existence and then annihilate. 494 00:24:25,119 --> 00:24:27,559 But at the event horizon of a black hole, one 495 00:24:27,599 --> 00:24:30,799 particle can fall in while its partner escapes into space. 496 00:24:30,680 --> 00:24:34,079 Speaker 1: And that escaping particle is Hawking radiation. And because the 497 00:24:34,119 --> 00:24:36,920 particle that fell in had negative energy, the black hole 498 00:24:37,000 --> 00:24:39,279 slowly loses mass, it evaporates. 499 00:24:39,599 --> 00:24:42,799 Speaker 2: Over trillions and trillions of years, it shrinks and disappears. 500 00:24:43,440 --> 00:24:46,799 And here's the dilemma. When the black hole is gone, 501 00:24:47,119 --> 00:24:52,200 where did the information go? Is it destroyed, violating quantum mechanics, 502 00:24:52,559 --> 00:24:56,160 or is it somehow encoded in that seemingly random hawking 503 00:24:56,240 --> 00:24:59,160 radiation which would violate our understanding of gravity. 504 00:24:59,400 --> 00:25:02,640 Speaker 1: It's the ultimate cliffhanger. It proves we need a new theory, 505 00:25:02,759 --> 00:25:05,759 a theory of quantum gravity, to unite the two, and 506 00:25:05,880 --> 00:25:07,640 right now we just don't have it. 507 00:25:07,640 --> 00:25:10,599 Speaker 2: It shows that even at the largest scales, this quantum 508 00:25:10,640 --> 00:25:12,640 weirdness is the dominant mystery. 509 00:25:12,839 --> 00:25:14,720 Speaker 1: So let's wrap up with the idea that takes all 510 00:25:14,720 --> 00:25:18,279 this weirdness about measurement to its most unsettling conclusion. The 511 00:25:18,279 --> 00:25:19,480 Many World's interpretation. 512 00:25:19,799 --> 00:25:22,279 Speaker 2: This is a radical solution to the measurement problem. It 513 00:25:22,319 --> 00:25:25,960 says the wave function never actually collapses. Instead, every time 514 00:25:25,960 --> 00:25:29,559 a quantum measurement is made, reality itself splits into multiple 515 00:25:29,599 --> 00:25:30,480 parallel worlds. 516 00:25:30,759 --> 00:25:33,039 Speaker 1: So if a particle is fifty percent spin up and 517 00:25:33,079 --> 00:25:36,119 fifty percent spin down, it's not that it chooses one. 518 00:25:36,279 --> 00:25:39,039 It's that both outcomes happen in one universe it's spin up, 519 00:25:39,160 --> 00:25:42,640 and in an equally real parallel universe that just branched off, 520 00:25:42,759 --> 00:25:43,519 it's spin down. 521 00:25:43,880 --> 00:25:47,039 Speaker 2: Exactly, all possible outcomes are real, they just exist as 522 00:25:47,039 --> 00:25:51,119 separate universes that can't communicate, and since quantum events are 523 00:25:51,160 --> 00:25:56,000 happening constantly, the number of branching realities is well, it's 524 00:25:56,039 --> 00:25:56,880 beyond imagination. 525 00:25:57,160 --> 00:25:59,240 Speaker 1: To really get the personal implications of this, we have 526 00:25:59,279 --> 00:26:03,359 to talk about the quantum Russian Roulette scenario or quantum immortality. 527 00:26:03,359 --> 00:26:05,440 Speaker 2: Okay, so imagine you're sitting with a gun pointed at 528 00:26:05,440 --> 00:26:08,519 your head, but the trigger is connected to a quantum event, 529 00:26:08,880 --> 00:26:12,480 like a decaying atom. If the atom decays, the gunfires. 530 00:26:12,799 --> 00:26:15,000 If it doesn't, it just clicks. It's a fifty to 531 00:26:15,079 --> 00:26:17,319 fifty shot. Each time you pull a trigger, you pull 532 00:26:17,319 --> 00:26:18,119 it one hundred times. 533 00:26:18,240 --> 00:26:20,720 Speaker 1: From an outside observer's point of view in a single universe, 534 00:26:20,720 --> 00:26:22,960 they're going to see you die pretty quickly. The odds 535 00:26:23,000 --> 00:26:25,720 of surviving one hundred poles are basically zero, but. 536 00:26:25,720 --> 00:26:29,319 Speaker 2: In the many world's view, with every pole, the universe splits. 537 00:26:29,880 --> 00:26:33,160 After one hundred poles. There are trillions of universes, and 538 00:26:33,200 --> 00:26:35,440 in the vast majority of them, the gun went off. 539 00:26:35,599 --> 00:26:36,039 You died. 540 00:26:36,279 --> 00:26:40,319 Speaker 1: Here's the twist. Your consciousness, your subjective experience, can only 541 00:26:40,359 --> 00:26:42,160 continue in the branches where you survive. 542 00:26:42,519 --> 00:26:46,119 Speaker 2: You only experience the poles where the gun clicks. From 543 00:26:46,119 --> 00:26:47,920 your point of view, you hear one hundred clicks in 544 00:26:47,960 --> 00:26:51,960 a row, you feel immortal in every branch. Where the gunfires, 545 00:26:52,240 --> 00:26:56,240 your experience in that reality just ends, but your awareness 546 00:26:56,279 --> 00:26:59,160 continues shuffling into the surviving branch. 547 00:26:59,400 --> 00:27:02,279 Speaker 1: That's a really strange thought. So every personal life today 548 00:27:02,319 --> 00:27:04,880 is here because we're the versions of ourselves that survived 549 00:27:04,880 --> 00:27:08,119 countless quantum coin flips in the past. That near miss 550 00:27:08,119 --> 00:27:11,720 car accident in another universe. It wasn't a near miss, 551 00:27:11,880 --> 00:27:14,440 but our consciousness is here, and the one where we 552 00:27:14,519 --> 00:27:15,160 swerved in. 553 00:27:15,160 --> 00:27:18,200 Speaker 2: Time, trillions of other versions of you met a different fate. 554 00:27:18,680 --> 00:27:21,079 Your single threat of experience is the one that navigated 555 00:27:21,079 --> 00:27:22,119 the maze successfully. 556 00:27:22,279 --> 00:27:26,160 Speaker 1: So from Shordener's cat showing, observation defines reality to entanglement, 557 00:27:26,200 --> 00:27:31,279 defined distance to many worlds, splitting existence itself, the universe 558 00:27:31,359 --> 00:27:33,599 is just fundamentally paradoxical. 559 00:27:33,880 --> 00:27:37,039 Speaker 2: And this strangeness isn't just theory. It's the foundation of 560 00:27:37,079 --> 00:27:41,839 modern technology. Embracing this weirdness, accepting that reality is probabilistic 561 00:27:41,920 --> 00:27:43,039 until observed. 562 00:27:43,480 --> 00:27:45,839 Speaker 1: That's the key we have to accept. We live in 563 00:27:45,880 --> 00:27:48,200 a world where a particle is aware of an observer, 564 00:27:48,480 --> 00:27:52,000 where truth depends on who's measuring, and where two most 565 00:27:52,000 --> 00:27:55,200 basic laws of reality are locked in a cosmic battle. 566 00:27:55,359 --> 00:27:57,920 Speaker 2: So let's leave you it a final thought, tying Wigner's 567 00:27:57,960 --> 00:28:02,079 friend and many worlds together. If your conscious perspective only 568 00:28:02,119 --> 00:28:06,759 ever experiences the surviving branches of reality, what does that 569 00:28:06,799 --> 00:28:07,240 do to you? 570 00:28:07,519 --> 00:28:11,519 Speaker 1: Does the idea of this quantum immortality make you feel 571 00:28:11,559 --> 00:28:15,599 safer that you're destined to always dodged the bullet? Or 572 00:28:15,599 --> 00:28:18,079 does it make you feel more isolated knowing that trillions 573 00:28:18,079 --> 00:28:20,440 of other versions of you have likely already perished in 574 00:28:20,440 --> 00:28:21,799 the branches you can't see. 575 00:28:21,960 --> 00:28:23,720 Speaker 2: We want to know your take on this. Does this 576 00:28:23,960 --> 00:28:27,319 terrifying quantum paradox change how you view your own life 577 00:28:27,359 --> 00:28:28,279 and the risks you take? 578 00:28:28,400 --> 00:28:30,319 Speaker 1: Let us know what you think in the comments, and 579 00:28:30,400 --> 00:28:33,559 until the next thrilling threads, keep questioning the nature of 580 00:28:33,599 --> 00:28:34,160 your reality.