Imagine traveling through time, seeing the past or future… and then forgetting it ever happened. 🕰️ Sounds like a sci-fi plot twist, right? But according to a new study, this wild concept might not be fiction after all. Scientists say time travel could be possible—but your memory won’t survive the trip. So what’s the point of going if you won’t remember a thing? Hit play to unravel the mystery, question reality, and find out why your brain might be the biggest time-travel paradox of all. Animation is created by Bright Side. ---------------------------------------------------------------------------------------- Music from TheSoul Sound: https://thesoul-sound.com/
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00:00You may have time traveled multiple times already.
00:05You just don't remember it.
00:07A recent study says that all your memories of the trip would be completely erased as soon as you're back in the present.
00:13And you can blame it on something called entropy.
00:16To explain it, we first need to talk about closed time-like curves, or CTC.
00:21This is a closed path where a particle could travel, and it ends up right back at its starting point, at the exact same time it left.
00:30In other words, it's like a cosmic time loop.
00:35Take this notebook paper.
00:37Picture each line as a different timeline with a beginning, a middle, and an end.
00:42Now if you roll that sheet of paper, the lines connect.
00:45Suddenly they form a continuous line with no beginning or end.
00:49That's what CTCs are.
00:51Closed timelines that don't have a starting point.
00:55Past and present blend together in an internal time loop.
01:00Now, a more practical example.
01:03You're taking a walk around a park.
01:05A woman jogs past you, and a dog starts barking.
01:09You keep walking, but then, wait a minute.
01:12You realize you're back at the exact spot where you started.
01:15The same woman jogs by, and the dog barks again.
01:18But here's the thing.
01:22It's not just that you've returned to the physical starting point of your walk.
01:26In a closed time-like curve, you're retracing not only your steps, but every single second of reality itself.
01:34All right, now think about the big moments in your life.
01:38Being born, graduating from college, getting married.
01:42If all these events are part of one big time loop, that means time travel is possible.
01:48It sounds crazy, but there's a concept behind it called the self-consistency principle.
01:53It says that time travelers can't create time paradoxes.
01:58I mean, time travel can't just be this wild, chaotic mess like those crazy butterfly effect scenarios.
02:05Even if you go back in time, everything in your life still has to fit together in a way that makes sense
02:10and lines up with what we already know today.
02:13I'll explain.
02:16Let's say you go back in time and stop your mom from meeting your dad.
02:20But here's the problem.
02:21If they never meet, then you wouldn't exist.
02:24And if you don't exist, how could you have gotten into the time machine in the first place?
02:30That's a time paradox.
02:33That's why time travel could only work within these closed time-like curves.
02:37No matter what you do, the past, present, and future are locked in.
02:42They're always going to play out the same way, like a loop.
02:47Okay, so now you understand what CTCs are and why they're important for time travel to make sense.
02:54Now, we can finally talk about entropy and why it's probably the reason we'd lose our memory after a trip to the past.
03:02Entropy is a way to talk about disorder, chaos, or randomness in a system.
03:07Imagine a super clean, minimalist bedroom where everything is neatly arranged.
03:13Everything's in order.
03:14That's low entropy.
03:16But then, picture a messy teenager moving in.
03:19Every day, clothes, books, and random stuff gets scattered around the room.
03:24It's a mess.
03:25That's high entropy.
03:26In nature, things usually trend toward more disorder unless you actively work to keep them organized.
03:33Like this ice cube.
03:35It's made up of water molecules, all neatly lined up in perfect order.
03:39Low entropy.
03:41But if you take this ice cube out of the freezer, it will melt into water.
03:45See how the puddle looks messier now?
03:47In this form, the water molecules can be arranged in so many different ways.
03:52They're all disordered and random.
03:54And that's higher entropy.
03:57If we apply this idea to time travel within a CTC, the closed time loop, things get even more interesting.
04:05According to specialists, a key feature of this circular journey is that the level of entropy has to be the same at both the beginning and the end of the trip.
04:13Here's an example.
04:15You're just living your everyday life.
04:17Nothing too exciting going on, so the entropy level is low.
04:20But then, you get inside a time machine and go back to the past, right before you broke up with your high school sweetheart.
04:28By traveling through time, the chance of you changing the past and totally throwing your story into chaos is pretty high.
04:35Let's say you don't break up with her, and in this second chance, you decide to propose to her.
04:41See how everything could go totally sideways, right?
04:44So, when you go back to the past, the entropy is at a super high level.
04:48Now, you get to the exact moment when you're about to talk to your past love.
04:54At that point, entropy is at its peak.
04:58You're about to kneel down, show her the engagement ring, when, well, here comes the self-consistency principle, and it throws a cold bucket of water on this whole romantic idea.
05:08Remember, in a closed time-like curve, nothing can significantly change the present reality.
05:16All the changes a time traveler makes in the past can't cause any historical paradoxes.
05:22So, sorry to say, but you're not going to end up with her anyway.
05:27You decide to hop back into the time machine and return to the present.
05:30You get back into your routine, your job, and, well, your single life.
05:36After completing the time loop, your timeline is back in order.
05:40Now, the level of entropy is low again, just like it was at the beginning of your journey.
05:45It's like you did a reset on the system.
05:48And that's the bad side effect of all this.
05:51Pressing this reset button would probably erase all your memories of the trip by the time you get back to the present time.
05:59Unlike in the movies, a time traveler probably won't recall anything.
06:04What?
06:05Now, answer in the comments.
06:07Even if you can't remember what you did after going back to the past, would you still take the risk?
06:13I'm guessing your answer would be, yeah, of course.
06:16That would be my answer, too.
06:18After all, we could bring our phones and still make tons of cool photos on this trip, right?
06:24Well, no.
06:26This is where the laws of physics crush our hopes.
06:28Again.
06:30The second law of thermodynamics says that in an isolated system, entropy or disorder tends to increase over time.
06:38But this doesn't apply only to humans, but also to non-living things.
06:43It's why you can't unscramble an egg, unmix coffee from milk, or take your phone into a time machine.
06:51If a time traveler stores any data on their smartphone during their journey, experts believe it will probably get wiped out as soon as the trip ends.
07:00All the videos, photos, poof, gone.
07:03That's because machines probably wouldn't work properly when we go back in time.
07:09For example, let's say you bring a classic analog watch with you.
07:13For all the reasons we've already talked about, when you come back to the present, the clock needs to be exactly where it left off.
07:21I mean, the clock hands should be in exactly the same position at the beginning and the end of your journey.
07:28But to make that happen, it's likely that the frequency and number of ticks during the trip will be different.
07:35That could cause small problems in clocks made for regular time, making them unreliable.
07:40Something similar could happen with your phone.
07:43Its system probably wouldn't work as it should.
07:45All these consequences of time travel were described in a study by a mathematician, published in 2024.
07:53While his theory doesn't determine whether time travel is actually possible,
07:58it does point out the strict conditions that would have to be met.
08:03And, well, it seems like having a time machine at home might not be as great as it sounds.
08:08In the end, you wouldn't remember a single thing about your amazing trip,
08:14and you'd probably just end up exactly where you are.
08:19That's it for today.
08:20So, hey, if you pacified your curiosity, then give the video a like and share it with your friends.
08:25Or, if you want more, just click on these videos and stay on the bright side.
