Solution to the Grandfather Paradox

[@awomanshootingsomething5811]

This would be the worst way to find out you were adopted.

[@neatchip123]

One of the cleverest comments 😂.

[@nichsulol4844]

@@neatchip123 oxidation reduction need add complex law theory physics

[@soumyasishbhattacharyya2805]

Lmao

[@sureshms3071]

😂😂😂

[@novablanco6472]

Lmao

[@hanseleve]

The easy answer: Two timelines The hard answer: this video The complicated lore answer: You ARE your grandfather

[@LumaSloth]

Good one

[@obviously1429]

What?

[@imaginarystranger1974]

@@obviously1429 Futurama, that's what.

[@bsgfan1]

“I did do the nasty in the past-y”

[@sun5705]

what if i was a test tube baby?

[@atomicnolxix]

They always say "What if you killed your Grandfather" But they never say "Why would you kill your Grandfather"

[@Kabir_777]

😔

[@FirstnameLastname-rc4xq]

Reality is often disappointing 😔

[@viswajithj788]

Hmm..."How would you kill your Grandfather".. Just saying...

[@PERFECTHEART-14310]

*_Why not?_*

[@randomnickify]

Well, for example if you realized your original family name was Hitler :D

[@TravelBass]

I think that, the most "practical" solution would be that the moment "you" leave your current timeline and so become a "time traveler" then you become immune to this kind of paradox. As soon as you leave your own timeline for the first time, you do not belong anymore to that timeline and not to any other timeline either. You basically become a timeless entity. So, you going back in time to kill your grandfather, would just result in killing your entire family except of you. If you then would get back on your original timeline, your family won't be there anymore, and never have been, but you would still be there. Another solution would be that "the universe always finds a way". So, if you go back in time and kill your grandfather, then you won't be born and so, "someone else" would be born, and that someone is the one that actually goes back in time to kill you grandfather. If you do not kill your grandfather, then this other "someone else" wouldn't be born.

[@NazirLer]

After 20 minutes of reading the comments i think this solution is the best one yet

[@djjay7777]

I like that idea. To add to it I personally think there are an infinite amounts of timelines and if you time traveled to kill your grandfather, you simply end up in one of thosr timelines and murder him and it would have been his fate to die by your hands and like you said you'd end up still being alive but as a timeless entity.

[@darlenesmith5690]

@@NazirLer Actually, the most practical solution is that the past does not exist. There is no place to go to. The future also does not exist. There is only the now. The ever changing present. For one thing, the Law of Conservation of Energy should prevent all time travel anyway. But with the concept of only the ever changing now existing, all time travel paradoxes do not exist because time travel itself does not exist. If this is true in reality, then there might not be other dimensions and there definitely would not be other times. Time would then not be a dimension like many people view it. We would still have the abstract concept of time that we use, but it wouldn't really exist in reality. Viewed mathematically, time would be a point, not a line.

[@bikebudha01]

i think you are right on the first half of what you say. Which i think is how they explained it in endgame. Your past is your past. It's already happened. Going back to the past and making changes is in your future. So you were born, you went back to the past, killed your grandfather - but you'd still be there. Wether you stayed in the past and just lived to the present - or if you time traveled back to the present.

[@AnthonyBarnett-c1p]

I like both of these. My solution is that when you go back, the universe itself prevents a paradox by making it impossible for you to kill your grandfather. Kind of like a "Final Destination" in reverse.

[@PhantomLizzard77]

I had a found a few errors in your understanding; however over all you are somewhat correct I'm totally kidding, I have no idea what is happening in this video

[@GAZAMAN93X]

lol

[@GazzyD]

This comment will have me laughing for days.

[@kitkatvonkitkat5454]

L O A D I N G...brb after 10 years

[@barontv450]

lol

[@danielsarwar7352]

lool

[@g7bz]

This guy messed with my brain for 2 minutes and 48 seconds straight.

[@obnoxiousknight1586]

Even the Google supporting at the end?

[@trendteaser9333]

Really? For me it was. Really interesting

[@aryanink]

hey look at my dp

[@TatvaToday]

You haven't seen "dark" have you?

[@nandagopalr8246]

no only 2min and 47 seconds😁

[@noobxgod1968]

GrandFather is dead and alive at the same time, Schrödinger's CAT : Ah Shit, Here we go again!

[@pierreicard]

Finally a worthy opponent

[@Gambit24]

:(:

[@shiaeliminator6484]

It's funny he threw away the logical solution of "it's a different timeline" just to give the same answer by they're both timelines at the same time, wich is basically the same. And just another version of the cat, yes🤔

[@TheAwesomeMrBones]

@@shiaeliminator6484 It's you diferent situations. In first one the two timelines are independent and in the superposition one they are related. It's not that there ate two timelines but only one in two simmultaneous states. If you interact with one state the other will be affectef too (from a quantum physics point of view).

[@dazaiosamu7518]

Watch Dark ,, you can understand it ,,

[@SillySyrup]

You could argue that if you did have access to a time machine, it is impossible to kill your grandfather because you already failed. Many people forget that if something happened or didn't happen in the past, then it must stay that way because that moment was solidified into history. You can't "go back and change" the past. For example, if you went back and talked to your past self, then you would have already experienced that at a younger age.

[@stardrake691]

@SillySyrup That brings up another question. If you were visited by your future self, and he said that you will create a time machine and travel to talk to your younger self when you get order, do you have a choice? Can you avoid creating a time machine and do something else? if you did that, then your future self wouldn't have been able to talk to you when you were young, and thus no time travel.

[@SillySyrup]

@@stardrake691 No, you wouldn't have a choice. That means that you would think about it and decide to create it eventually.

[@itsnotderryl]

So you just really can't break through it?

[@SillySyrup]

@@itsnotderryl Not exactly. No magic force is stopping you. However, some plausible, physical force will stop you from completing the goal. Like I said, you've already failed.

[@itsnotderryl]

@@SillySyrup ohh

[@Ajaykumar-vt3lu]

After watching tenet, youtube recommends grandfather paradox.

[@sinxnq]

Yeah😂

[@aftabchohan945]

Same here😂

[@andreyion9456]

Yea youtube knows maybe u have wached tenet explained videos om ytb and the alghoritm knows what u wach and recomends this video

[@hiteshsharma526]

Same

[@user-fp1op5dn2j]

Same here

[@haljoa5165]

Someone complained about something about this comment, now no one shall know what it originally was

[@Catcat55566]

haljoa fuck this is genius

[@victormatterstorm196]

*slow clap

[@feelsoevil]

*insert funny pun here*

[@leviverbeek02]

he wouldnt be killing his own grandfather then right?

[@terrencefernandez3681]

if that were to be the case ur life would still dramticly change because if u kill the grandfather of the person who adopted u then the person who adopted u wouldntv of been born therefor u wouldnt of been adopted by that person meaning u would be adopted by someone else. assuming that there is another person who adopts u witch would most likely be the case but since we dont acctuly know then anything could happen. i guess.

[@skefle6596]

I love how the mathematicians try to solve a problem that isn't even possible

[@jhwhthemerciful]

Hi everyone. I happen to have quite a paradox that would fit in this video and I would gladly share it with you. We have a murderer in the dark ages and he is caught. It is sunday and the murderer stands in the courtroom to hear his sentence. The judge tells him that he will be hanged the next week, between monday and sunday. The judge also tells him that the morning of his execution he can not know for certain that he will be hanged that day. So we have two conditions: The murderer WILL BE hanged the next week between monday and sunday. And he CAN NOT know for certain, on the morning of his execution, that he will be hanged that day.

[@galofuf]

@@jhwhthemerciful my man gotta guess when hes gonna die

[@benbrownlee6112]

Time travel is possible according to the laws of physics

[@omokok1877]

Ne Dom activities

[@maddogkilla1]

@@jhwhthemerciful that's a weak paradox and more of an inconvenience

[@watchtowerguy2299]

Both of the solutions you used involved a different form of time than the paradox uses. The first one, you used was the one where you travel back in time, and that creates a new reality, the second one, was the one where there are two interconnected reality’s, where your actions in the past, only effect one reality. The grandfather paradox, uses the form of time travel, where there are no others reality’s in existence, or that can be made. If you use a different form of time, it’s not actually the grandfather paradox, it’s not even a paradox.

[@claytoncourtney1309]

Why does it have to "create a new reality"? Can't you just travel to an already existing universe? If you can imagine all of the possible timelines already existing and we are just in one of them THEN time travel could be seen as BOTH time travel and universe travel. So you can not co back in your OWN timeline but you can go back in in time in a timeline that is near ours. In the 2nd timeline you do not get born because you killed your grandfather in that one. There are still billions of timeline where you are born and billions more where you are not but only one has your existence removed based on your actions.

[@watchtowerguy2299]

@@claytoncourtney1309 two different ways to look at what you are saying, one still being that you create a new universe (reality). And if you are travellinh to a separate universe, then you arent actually killing your grandparents, you arw killing somebody else's grandparents causing no effect. I cant explain exactly how it works, but you cannot travel into a different reality, that is in a different time line. Another way to look at what you have said with the timelines, is that you go back in time and alter the timeline through killing your grandparent, two different things that could happen is either the exact same paradox, or creating a new time line in which you dont exist, but for that to happen you must have survived in your reality meaning that the grandfather paradox not happen.

[@davewilliam5228]

Grandfather Paradox state's that person builds time travel machine. Person travels back in time. Person kills his younger grandfather before younger grandfather meets younger grandmother. Father is not born and baby person is not born. Person is not travelling back in time.

[@adamb89]

There's also the Novikov Self-Consistency Principle, which basically states that no paradox can happen. If you go back in time, everything you do will be consistent with history. Any attempt to influence events merely causes them to play out exactly as they did in the past. So you would be unable to kill your grandfather no matter how hard you tried. That event never happened, so it can't happen.

[@ferhanali2569]

Yeah I like this one too, have heard of it! Thanks for reminding me! 😀👍

[@OmniCroissant]

Like in Harry Potter and the prisoner of Azkaban.

[@adamb89]

@@OmniCroissant You may be interested in the fan fiction "Harry Potter and the Methods of Rationality" then. It's sort of a "What If" alternate story, and at one point he conducts experiments using the Time Turner and concludes that the timestream is self-consistent and no paradox can occur.

[@oncetwice6366]

I don't understand why this even is paradox. According to Einstein's theory we cannot go back in time. Only slow it down or speed it up in relation to others. Meaning you'd stay in the moment but not go back in time.

[@adamb89]

@@oncetwice6366 Mainly because, from a mathematical perspective, time works both ways therefore time travel is mathematically possible. The kicker is it requires exotic matter that we don't yet know exists. Something with negative mass or negative energy. It's mathematically possible, but we don't yet have physical evidence.

[@xoocit]

I was explaining this to my friend and his grandfather walked in🤦🏻‍♂️

[@omega-man1736]

I know you are lying son, don't worry your secret is safe with me

[@UECAshutoshKumar]

@@omega-man1736 😂

[@somejellyartywitchyhuman485]

Lol

[@YoloLollipops]

Kill the grandfather

[@Drew_Hurst]

Awkward!

[@hiyukelavie2396]

A more interesting paradox is one where you time travel back a second time to stop yourself from doing something that you did the first time you time travelled

[@Captain_Timezone]

Like i go to slap someone but future me stops me so i would automatically go back to the present but i would still slap that person

[@briansammond7801]

That is the plot of a great Science fiction short story by Alfred Bester, titled "The Men Who Murdered Mohammed." I highly recommend it.

[@caramurad]

like when flash goes back in time to stop himself going back in time and saving his mother's life.

[@michelealessandrini3421]

Also "Primer" is another great movie with similar intricated scenario

[@anubhavpal5782]

yup, was done in the show called the flash

[@rayray117]

You know you’re old when a small kid shoots you saying you’re his grandad.

[@SickVoid]

I've always thought of it that way: What you did in the past happened in the past so it must have already affected the future you are currently in. By time-traveling you are causing the future that you came from. So no matter what you do in the past it makes the future that you come from happen in the first place, a future where your grandfather is alive. Therefore, you can try as hard as you like, but you cannot kill your grandfather because something will always happen to prevent it. Otherwise you wouldn't be there to kill your grandfather in the first place. Hope this explanation made sense.

[@yashprajapati8857]

Yeah... There is a even physics theory that it is impossible to do something in the past that affects and changes the future.

[@Shadow-Shell]

Like the movie Alice through looking glass

[@lokeshr8580]

Harry Potter, Game of thrones, Dark all follows the same time travel theories.

[@sagnik3556]

It's called the bootstrap paradox

[@Charliezard7]

@Denny of Den Kat Games well, your past self could freak out and try stabbing you with the scissors so... I mean many things can interfere. Or you can even be afraid of changing the past and return to your time. Even in the simplest situations this can be taken into consideration

[@Lucabistrong]

It all depends on what logic of time travel you follow. There are 3 main theories. The first, as mentioned in the video, is that there are alternate timelines in which certain major events in your life happened differently, so going back in time and changing something wouldn’t affect your timeline, but instead it would make a new timeline in which such an event had occurred. An example of this logic being used would be avengers endgame. This means if you go back in time and kill your grandfather, you’ll just be opening up an alternate timeline in which you were never born. However, this timeline would not affect yours at all. The second theory is that it’s a closed loop. This means that while the events do happen in your own timeline, they don’t affect them, since they’re predestined to happen the same way and nothing will change that. This event has occurred many times before and will continue to happen many times over since it’s a loop. An example of this logic being used would be the movie tenet. This would mean that if you went back in time, you might’ve tried to kill your grandfather, but somebody would’ve stopped you, this is because you’re obviously alive up to the point where you’ve went back in time, which means your grandfather hasn’t been killed. This means you’re destined to fail at killing your grandfather, and this event has probably occurred a million times before and will continue to occur a million times more. The final theory is the one most people follow, which is what makes it a paradox. This is the one in which changes to the past will directly have an affect on your timeline. This means that by killing your grandfather you would in fact cease to exist, but in doing so, your grandfather would still be alive. This remains unanswered within the context of this theory.

[@noahishy4158]

hey bro. i think i got the answer. just say if you wanna hear it.

[@Lucabistrong]

@@noahishy4158 I’d love to

[@eliftr06]

@@Lucabistrong I didn't understand anything out of the video but you explained it very well.👍🏻 I think this type of paradox is impossible to exist because, as you mentioned, he has to have lived to the point where he tries to kill his grandfather to be able to attempt this action in the first place. So he could in no way be able to prevent himself from ever being born, which is why he would not be able to kill his grandfather. So in real life, your second theory is the most and actually the only probable way for all these to happen, in my opinion. Do you have any other movie suggestions with regards to this kind of time travel incident/paradox?

[@maddogkilla1]

"Killing your grandfather you will cease to exist but in doing so your grandfather is still alive" might want to fact check what you wrote here broh. The act of killing someone doesn't cause them to still alive lmao

[@maddogkilla1]

@@eliftr06 he didn't explain very well at all? He claims 3 main theories, um okay? The third one didn't make any sense and the first one he forgot to mention that you create a new timeline where you aren't born but you are still alive after you kill grandpa so you will keep living in that same timeline and basically replace yourself with yourself.

[@jojomark4946]

Him: But that's just avoiding the paradox Also him: By the way there is no paradox MOVING ON

[@venkatdenduluri816]

Exactly 😂

[@giovannitorres9337]

I mean, isn’t the idea of quantum superposition and schrodinger’s cat essentially saying there is a second timeline is created? There is a possibily, an existence where Schrodinger’s cat is dead and another where it’s alive. Only by opening that box do we find out the reality we’re in. And similar with the grandfather paradox, by time travelling and offing grandpa then travelling back you go off and create a new possibility, a new existence where your grandpa is dead and kid you doesn’t get born. Now ofc the time travelling paradox is a bit more complex as it has multitudes more of possibilities. 1. How time travel works, particularly when you go back. A) When you go back after killing grandpa, you return to your own timeline where no-one ever killed your grandpa. But the existence of a timeline where your grandpa is dead, and you were never born runs parallel to your original timeline. B) When you go back after killing your grandpa, you’re forced to live in that new timeline you created. You’re basically a time alien, foreign to thar reality. An existence where you came from where you were born but live in one where you never were born. C) The fire life reality: By doing the deed, you cease to exist and just disappear but your actions remaining particularly the grandpa killing part. Its kind of like a fire, you burn and destroy and create havoc but once you’re done you disappear and vanish without a trace of your existence except for your handiwork.

[@schwingedeshaehers]

@@giovannitorres9337 no (to the superposition is creating a second timeline), it depends on the interpretation

[@ybadexmadrra7736]

But how does being alive play into this like if I killed my grand father and suddenly ceased to exist but if I'm not alive I can't think so???

[@milkmariobros]

Another Paradox: If Pinnochio said "My nose will grow now", What happens?

[@jan_Masilijun]

his nose grows after an amount of time, so the 'now' part is false but the nose still grows

[@Nathan-qq3mt]

@@jan_Masilijun What about "My nose will grow soon"?

[@jan_Masilijun]

@@Nathan-qq3mt his nose grows after a very long amount of time

[@Noa.Orenstein]

I think I have the answer! If Pinocchio had the ability to predict the future, then he would know what he was talking about. But when he says something based on nothing, it doesn't mean anything. It cannot be considered a lie if he himself does not know what the truth is, therefore it is only a statement. But let's say Pinocchio has the ability to predict the future and he says the same thing, in this case his nose will grow because that's what he sees. But probably for another reason unrelated to the lie, just to make this prophecy come true even though no lie was told. They will find another reason for this to happen, a whole plot will be created about this strange phenomenon.

[@davewilliam5228]

Grandfather Paradox state's that person builds time travel machine. Travels back in time. Person kills his younger grandfather before younger grandfather meets his younger grandmother. Father is not born and baby person is not born. Person is not travelling back in time.

[@jchillin5884]

anvengers endgame writers: “write that down, write that down!”

[@Charliezard7]

Nah, in endgame it was the complete opposite

[@jayyadav1610]

Endgame's time travel was shit and full of plot holes

[@dafuanisnothere]

@@jayyadav1610 It wasn't shit if u learn Deutsch's Parallel Universe !

[@bintangtrawijaya6460]

@@dafuanisnothere cap gets old.

[@dafuanisnothere]

@@bintangtrawijaya6460 It's kind of complicated, he have broke the science.

[@sohamdutta5827]

Just call it, Schrodinger's Grandfather.

[@cmplsvpen591]

I thought i was the only one....

[@MISHRAIF]

ya thought of that myself today.....gdaddy exists and doesn't :)

[@blitzie66]

Soham Dutta grandpa is both alive and dead but when you check him which outcome is it

[@GuckDaBaws]

appart for Shrödingers Cat not working like this... sure

[@azraelle6232]

"Back in my day, we existed in only one time loop, forward through time both ways, and we didn't complain!"

[@chrisa3199]

today I woke up and said to myself, " I will not learn any physics today" and what do you know... I still didnt learn any physics

[@artespinoza9242]

Yay summer!

[@philipshin7016]

Haha! Fuck you school (even though you're a privilege and I do enjoy you quite a lot at times but still fuck you)

[@faboitas]

you're god damn right!

[@Maru-nu7ll]

DerpMonsterProductions h

[@jefferyhoffman6567]

DerpMonsterProductions i

[@Tysto]

I like to imagine that a time machine would only be able to place you back in time on a path that does not create a paradox. After all, it must be able to “see” into the past. You could do anything you want except things that result in you or the time machine not existing. This creates interesting story possibilities, like you fail to kill a villain & later learn he was your own great-great-grandfather, so of COURSE you failed.

[@davewilliam5228]

Grandfather paradox state's that person builds time travel machine. Person travels back in time. Person kills his younger grandfather before younger grandfather meets younger grandmother. Father is not born and baby person is not born. Person is not travelling back in time.

[@hoanganhpham4621]

I went back in time to kill my neighbor but I started dissapearing from the timeline.

[@AceDeclan]

Its impossible. You won’t die at all. Didn’t you understand the beginning of the video? The grandfather paradox is wrong.

[@hoanganhpham4621]

@@AceDeclan r/woooosh

[@hoanganhpham4621]

@@AceDeclan oh ok

[@giphytune5223]

I get your gist. But that is nasty.....

[@eyeverse7184]

Daltira I think your just trying to cover up your stupidity

[@Capitan_77]

TENET people what’s up

[@raythedude1692]

Ayyyyu

[@kenzito101]

Wazzzup

[@Titankiller-fz4tn]

I did not understand that movie at all

[@davidraveh5966]

@@Titankiller-fz4tn it's not as complicated as Dark...

[@handagoat7193]

@@Titankiller-fz4tn me either

[@VIMAL-xh8wr]

Polt Twist: your grandmother had an affair that's how your father Born. Knowing this after killing you Grandpa: "WASTED"

[@thorisop1040]

Underrated 😂👌

[@TheBrickagon]

Or what if when you go to kill him you get hit by a car and so you can't kill him anymore? :))))

[@jeffireymurdock2073]

I dont wanna be that guy but... Polt

[@shiz2086]

@Justin Y? My god how do you guys even come up with this kind of speech skills

[@marcusanimations1843]

@Justin Y? why are u everywhere

[@h.a.z.m.a.t5072]

I believe what would happen is that your grandfather would die and then you would continue existing. So if you were to go back to the present then you would spontaneously appear out of nothing. The way I look at this is to look at the timeline as some sort of word document. The original text said that your grandfather survives, but then you went back in time and made an edit. I don’t really know how to express this theory, it’s hard to put it in words. Another way to look at it is the following scenario. There is a division of soldiers and their major general orders them to attack a nearby enemy base. Then the major general decides to at the enemy base is too well defended and orders the soldiers to retreat. Which order will the soldiers listen to. The most recent one.

[@electrocubic5116]

It is funny to imagine people watching you appear out of thin air 😂. We can say it is sort of like "overwriting" your past. If you time travel to the past, it becomes your new future, where you co-exist with the past people and become a part of your past. But idk how all this would affect a person's age? Would it remain the same or increase according to how far back you time travel to. This stuff is pretty crazy tbh.

[@datboi42]

@@electrocubic5116I think it would just remain the same. Like you would age at the same rate

[@davewilliam5228]

Grandfather Paradox state's that person builds time travel machine. Person travels back in time. Person kills his younger grandfather before younger grandfather meets younger grandmother. Father is not born and baby person is not born. Person is not travelling back in time.

[@divinecreation6]

The example you used is nonsensical

[@MilanMilan0000]

My brain is melting

[@aidanferguson5963]

Same

[@greg77389]

+Vegeta You should borrow Bulma's time machine and test this paradox yourself

[@youssefyoussef8121]

Exploding*

[@ultimaxkom8728]

Trying to Google my brain, but instead found this: error 404: Not Found!

[@Red_Lanterns_Rage]

grow those brain cells. learn something lolz you're brain isn't melting, it's trying to learn something new.....let it learn....OPEN YOUR MIND QUAID.....wait, what??

[@TheMinecraftMan757]

_brain.exe has stopped working_

[@PranshuNigam11]

lolllll

[@AnotherCuber5050]

+TheGamerMan757 Have you tried turning it off and turning it on?

[@shaunhopkins2130]

Mind blows up like the Death Star

[@azyfloof]

+TheGamerMan757 "Process BRAIN.DLL halted unexpectedly" I get that error a lot on these videos. Still waiting for a patch :(

[@samanthathepinkjaguar4606]

+TheGamerMan757 reloads brain.exe and uploads understanding.exe to brain.exe and saves brain.exe

[@masterchief5603]

So u mean, *_YES BUT ACTUALLY NO._*

[@thisguyispeculiar]

Yeah that pretty much sums it up.

[@vere9652]

Yes, but actually no

[@unknow11712]

it is not a paradox , but it is impossible .

[@nichsulol4844]

@oH well,lord! when wormhole is actived gravity is too strong

[@TatvaToday]

Schrodinger: yed

[@_BONAL_]

I had 3 solutions to this paradox. 1. When you travel back in time you create another timeline 2. When you travel back in time, you travel as a ghost so that you can't interfere with the past. 3. Anything you did in the past couldn't interfere with critical situations that happened already in the present because it was already destined to happen, meaning you would always fail trying to kill your father by whatever you tried to do because that would change the destiny... Of course the other solution was that the future could be change like you told in the beginning

[@anticorncob6]

I'm creating a fictional universe where backwards time travel is possible, and I'm going with your #2. It or something similar to it seems to be the only logical way to make it work without creating multiple timelines or sacrificing free will.

[@DarkXypher]

4. You're adopted

[@hasnaindev]

There are NO paradoxes. You're born, a living being with cells and organs, your parents or grandparents being alive or dead has no bearing on whether you exist or not because you already do. Let's say, you go back in time to kill your grandfather. Your grandfather would die but you simply won't vanish. The collection of cells that is you will still be there. Let's say you travel back to your own time now, your family just wouldn't exist nor would the world know you exist. Just a man with no paper trail or documents appeared out of nowhere. There wouldn't be another YOU either that can come up and stop you because, in this singular timeline, you're the only you that exist. This leaves no room for paradoxes. Of course, there might be many things I might have not considered but feel free to discuss them with me.

[@ricksummerfield784]

It doesn't create a paradox, it just makes you a shitty grandchild

[@akshlo879]

​@@hasnaindevyou really gave a generic explanation without considering any time travel or time

[@CosmicFox2007]

Me seeing the beginning: hmm ok simple Looks away for 1 second: ***quantum physics***

[@Sea-zu4bj]

Quantum superposition isn’t that bad, it’s what you might learn in school if you choose physics. Google search should clear it up easy

[@MetaKnight68]

People assume that time is a strict progression of cause to effect, but actually, from a non-linear, non- non-subjective viewpoint, it's more like big ball of wibbly wobbly, timey wimey...stuff.

[@orangecrush4]

yesyesyes

[@VideoGameAnimationStudy]

+MetaKnight68 Sounds like that sentence got away from you..

[@menace992]

Chronos too stronk :D

[@stephanym.8563]

😍

[@dhruvdnar]

and listen.. dont turn your back, dont look away and dont blink

[@newguy90]

He says alternate timelines are boring as a solution and he won't do it, then he goes on to explain an alternate timeline.

[@waynehayes912]

It's the same timeline just with two different states. To give a metaphor as an example alternate time line are two separate coins. while his superposition timeline is the different sides of the same coin that's constantly spinning. Since the grandfather and grandson are constantly switching between existing or death the coin never lands .

[@LittleBigPoet]

What's up with all this people with letters has their youtube image?!!?

[@newguy90]

João Miguel If you do not have an image thumbnail, Google+ will take the first letter of your username and use that instead.

[@annojance]

+Wayne Hayes ...except it isn't "switching" between states; they're simultaneous, so it's logically equivalent to his original "boring" (his word) "solution" (not a solution, because it isn't actually a paradox to begin with).

[@modboy810]

You are right. It must be this duality crap they teach them at university... they don't seem to understand its a joke... they're taught that an electron is a particle... and that light has a speed... this is why time stops at light speed... There is no such thing as a paradox... I'm not going to answer weirdos that can't spell... or define a field... (I've made an edit as I don't want morons trolling me when all of this was answered before anyone on youtube was born) No I'm not going to offer anything new... Isaac Newton defined the field with his book Opticks... I have already credited him... All his equations are proved... e=mc2 falls apart with the cosmological constant meaning that c is not the speed of light... and its certainly not a proved equation... Relatively speaking folks these people are full of hot gas and fusion... Maxwell House was a brand of coffee that made people crap in the eighties... I'm not even going to argue with crap equations... Their math stinks... If they wanna post any proofs on here let it rip because its going to fall apart like a resolved fart... space time sounds like an event which comes after a fart... I'm not sure I need to define time that way... If relativity and fusion were to be believed there would be no Sun it would have been a brief spark following an explosion... And there would be no light...

[@youareivan]

I remember reading a collection of short stories I'd checked out from the local library when I was a kid. I'm pretty sure it was a collection of unfinished tales by C.S. Lewis, but I don't remember the title and a quick google search didn't turn up anything. Anyway, the book included a story about time travel where the main character suggests that you can't send something back in time because the atoms that make that thing up in the present already exist in the past being something else. For example the atoms that make up a chair now were part of a tree in the past, so sending that chair back in time would add a chair's worth of extra mass to the total mass of the universe which is a big no no.

[@tothewin5388]

So would the universe break or what

[@justinfox173]

This is what Avengers Endgame was trying to do

[@smysrbh]

Yo was waiting for this comment

[@SatnamSingh-mx2uc]

@@T33-j3t i think dragon ball z used similer concept.where you can't change the past..

[@alrafidmahadi4252]

@@T33-j3t Endgame established going out of the grand father paradox by creating an alternate reality. Loved it

[@Karlsteins]

Endgame use Multiverse concept instead of this “Back to The Future” concept

[@justinmagno1994]

They should've brought Tony back with the gauntlet. But contracts or whatever

[@horsepowermultimedia]

"Time only moves in one direction." *Flashes picture of the band called One Direction*

[@todabsolute]

Underrated

[@xovere2098]

Lmao I was looking for this

[@seymourkrelborn4780]

*c r i n g e*

[@dausbajing]

I thought I was hallucinating

[@imiss1D]

just goona type this

[@TheRabbitInTheTwoTonneHat]

"Time only moves in 1 direction" *shows 1 direction*

[@MAN-xs2lq]

0:04

[@ronaldmclawrence9965]

@@dokidoki7 why is it called a second? Hmmmmm

[@ronaldmclawrence9965]

@@dokidoki7 Why I asked the quedtion was that for what I was taught by my english teacher, second 2nd is the no 2 position. You mentioned it continues the pattern after 1st ( first) ya. But to gramatically say a second as the first position is like saying the zero 0 is irrelevant in its proper place ie. before 1. Remember, the zero is the thing the moves the nineth 9th to the tenth 10th. The omiting of the zeroth 0th, first position then putting it after the 1 to give you the 10th, shows one the truth of the numb ers. The mental numbness.

[@ronaldmclawrence9965]

@@dokidoki7 Fair enough. My interplay was more into the symetrics of reasoning based on given linguistics.

[@bidishaabanik]

I swear lmao

[@Tabby3456]

I feel like if you could go back in time, you are fated in some way to never kill your grandfather or do anything in the past that would contradict your own existences So for example, if you were to be visited by future you and be warned about something, you later on in the future will inevitably go back in time to warn your past self. So if no one has come back in time to warn anyone, then how is time travel (atleast backwards) possible?

[@JEELEN2]

It's an interesting quick step to show some advanced physics, but: - either time is linear and you can't go back in time, ergo there is no paradox in the first place; - time is not linear (otherwise you wouldn't have the paradox in the first place). In neither case however (both of which are just thought experiments) it is taken into account that we only *perceive* time as linear, whereas time is just a function of space: the space-time continuum, or simply space-time. So instead of juggling with timelines and parallel universes, one could simply pose that 'travelling back in time creates an insolvable paradox'. Why? Simply because if you actually *were* travelling back in time that simply implies a temporal regression. Simply put: if you are 50 now, you'd be successively, 40, 30, etc, an egg, a cell, etc. The whole idea rests on the illogical preposition that you would be able to travel back in time *as you are now*. That is essentially illogical. It places you *outside* the space-time continuum into a parallel universe (there it is again). Otherwise, nice concise explanation.

[@SuaveDavid]

+JEELEN2 Wow. I've had fleeting thoughts about this subject, but I've never heard it explained so elegantly or put enough complex thought into it to arrive at that conclusion. It is much more logical to assume that if you are "traveling" through time then it would effect your age. Thinking of it in the common way now seems, to me, comparable to suggesting that you could travel to another coordinate without changing your current coordinate.

[@ProlificPianist]

+JEELEN2 That's it exactly. You can slow down or speed up time, but nowhere in the universe (or at least known) does anything hit zero or go backwards, but instead can get infinitely close to zero. If you did manage to "go back in time" you'd have to reverse the flow of EVERYTHING in the universe and everything associated with it and everything associated with the associated and so on. In the end your mind would be regressing as well and you would never even notice you were traveling backwards. To go back in time according to pop culture idea would mean you are outside of the space-time continuum as you stated, which is BS to begin with. Time is just a an observation of the flow of matter and energy. While it is real, it's not it's own independent entity and is totally latched onto and dependent on energy. Energy gives way to time, but time cannot give way to energy. So if you changed time, you change all things before it along with it to relative speeds, including yourself. and wtf am I going into? I need to stop rambling on the internet...

[@andrewn.8654]

+JEELEN2 Thank you. I love this answer. more sensible than the video

[@JEELEN2]

Thanks for the compliments. Of course the object of the video is not to explain time travel paradoxes, but to show some basic (astro-) physics or cosmology. It just uses the time travel paradox as a step up to that. (And does it quite well.)

[@azmanabdula]

Not to mention if you could travel in time, the earth wouldnt be where it is today... The distance would get exponentially further the longer back or forward in time you went... So you would need a Space-Time machine : S

[@anuragdhole0805]

Time Paradox: (exists) Netflix Dark : Let us introduce ourselves

[@沈啍]

.ereht olleH :teneT

[@theouts1der]

Sic Mundus Creates Est

[@Terraphisto]

@@theouts1der *Sic Mundus Creatus est

[@esauponce9759]

Or the movie “Predestination “.

[@nashnn7583]

I am actually disappointed in Dark. The overused time loop where the girl's daughter is also her mother is not complicated ;it just doesn't make sense. I think they were trying to come up with complex subplots and ended up creating ones that don't make any sense Imho

[@davidwallerstein3113]

That one direction band picture in the beginning though...

[@dominicsurette2890]

I paused at the exact moment this showed

[@eddie246]

Lol

[@ozancanca9740]

Lol he says direction

[@marmartota5789]

@@ozancanca9740 *one direction. Listen carefully

[@sebastians7346]

what

[@Shreeraksha-ey8nl]

me : kills grand father Grand father : dead Me : still alive THIS IS THE WROST WAY TO REALIZE THAT YOU ARE ADOPTED

[@смирножюль]

War machine had an idea to go to the past and kill baby thanos

[@SonalShekharBhoi]

KZbin algorithm got us here...

[@sherlock4791]

if you kill baby thanos then there wont be any adult thanos and thus no one will snap the gauntlet and thus you won't have the reason to kill baby thanos, then you wont even travel back in time

[@dictatoroblitorator1115]

It just creates a parrallel time line

[@leonkrizmaric3776]

It just creates alternative reality so they had to take stones and bring them to their reality

[@biti3615]

Just Another Viewer h

[@v.t.3064]

Science teachers: the test won’t be that hard! The test:

[@fishplayztoh]

Underrated comment

[@belfordk]

@@fishplayztoh not really, the guy explains it better than a teacher. The joke is super bad, the guy literally explained it at the most easiest how to say something confusing

[@ananttiwari1337]

@@belfordk This!

[@belfordk]

@@ananttiwari1337 eh sorry I made the wrong reply

[@ddrix]

@@belfordk I assume the joke was about the test being to demonstrate why the grandfather's paradox isn't a paradox without using the multiverse theory. I agree that if you know about superposition and u think about applying this exact knowledge to this problem it's not that hard to create the logical chain showed in the video. But it for sure shouldn't be easy for most of the students in school, smh.

[@fljpopguy]

At the end of the video, did that guy look backwards to see if his future grandson was chasing him with a knife?

[@chupacabra9357]

+fljpopguy Funny!

[@brcha]

+fljpopguy also the predator sound was heard in the background. or a woodpecker, they do sound similar, but it was most probably a predator.

[@josephclegg3562]

While this video was being recorded, grandchildren out there were planning on traveling back in time to kill their grandfather.

[@andreysmirnov8892]

There's an lnteresting theory, called Novicov's self consistensy principle, that resolves this paradox. Basically, it states that there's only one reality that has already experienced all of time travellers' actions. So, for example, if you were born, then any attempt by any time traveler(including yourself) to prevent that is doomed to fail. There's a great videogame called "Quantum break" who's whole plot revolves around Novicov's principle.

[@mizuhonova]

I feel like your superposition of timelines theory is just a different way of describing the "copy" alternate universe. In both cases, you don't really affect your own history but a different version of it. Whether it eventually loops back to your own history is just extra details.

[@CSSuser]

Ikr!

[@Shalkka]

+John Doe if we have two parts with quuantum states their combinations also have quantum states. We can keep on having combinations of thse to build more complex states. There is no system size scale where quantum mechanics becomes inapplicapbe althught the trackability is easy to loose. One of the main points about schrödingers cat is that if we allow superpositions for atoms we must allow it for cats too, or somehow argue that attaching poison vials to geigercounters is impossible. Regardless the matrix steady state formulation gives a nice matrix that is hermitian that follows your criteria of being able to give eigenstates. There is a difference whether such explicit math formulation was given and whether it can be given. But if one looked into it even a little one could find that such a formulation could be given. Saying that someone is wrong because they have not said anything that would warrant to be convinced that what they say is right is a little hasty. It would mean that you are claiming that there is no eludication that could salvage the accuracy of the statements. So you claiming that such an hermitian matrix could not be given is highly bold claim. But because quantum phenomena underlie classical physics we know that grandfather do have wavefunctions. However they are so complex we usually don't bother to figure them out in expicit detasil and use classical (and other) approximations instead. But there is nothing preventing in principle to find out such functions and indeed for quantum to properly explain the classical such functions must exist. Double slit experiment requires for there to be no way of determining for some electron which slit they came from. There are also explicit path integral formulations where you sum over all consistent pasts. There seems not to be so big difference between multiple timelines and requiring that some events need to be able to have happened multiple ways. It isn't clear to me that the quantum is clear of multiple timelines (althought it doesn't seem to be a natural viewpoint).

[@EvolBob1]

+Paul Hill - The problem it has, is ignoring the fact paradoxes can't actually exist...to our mind it may look like it can, but that is just an illusion. For example we all know about Black Holes and the singularity inside each one of them...unfortunately there has been a miss-communication between the lay person and the scientist. Where the scientist knows this term is just '?' and lay person thinks a real singularity is there. Singularities invoke infinite values, and we can't have that, and it would also violate most of Quantum Physics that we know is true. Let take the Time Traveler to a logical conclusion not thought of: He does kill his grandfather, as further events transpire he discovers not only that his father was adopted, but the murder of Granddad caused the meeting between his parents. (and many other possibilities -- Grandma may have played around...not golf) It has to be like that, or we have new timelines.

[@Shalkka]

***** when you say "we cannot form a coherent conception of" whether you mean "I and nobody else can't think of a way to handle it" or "no conceptual aparatus could be able to handle it" is kinda critical. If you mean the latter then you have to argue that devices like meta-time are insufficient for the job. If the former its just an argument from lack of imagination/education. In general ontological time does not need to correspond to experienced time. Its kinda easy to implicitly assume so but things like these thought experiments make the consequences of the assumptions more explicit.

[@EvolBob1]

*****- Yes, I think I understand. If it is possible to travel to the past, it is okay as long as that time wave function is not collapsed. Trying to view some paradox will collapse it. For example I can pass down a note to my descendants to come rescue me from painful events in my life when a time machine is invented...unfortunately that hasn't happened. Anyway, where are all the 'Time Travelers'?

[@dlee645]

Most people think of time as a strictly linear progression of cause and effect, but actually, from a nonlinear, non subjective viewpoint, it's more of a...oh, never mind.

[@teslafoil1505]

Wibbly wobbly

[@unironicallyb8053]

+Tesla Foil Timey Wimey

[@unironicallyb8053]

+AlphaWolf28 Stuff

[@potato2248]

+Dlee645 dumbass

[@ParallaxScene]

+Baked potato 420 It's a quote...

[@Quizzingisfun]

As hulk said in endgame: If you go back in time, that time is your future and where you came from is your past, and by definition you can't change your past changing your future. Ergo you can't change where you came from by going where you want to go.

[@kato_dsrdr]

I like the terminator idea of this paradox.. Basically, it's impossible for you to kill your grandpa.. Whatever you do to the past inevitably cause the future where you came from..

[@Jvlerah]

I like that idea, but the simplest thing for us is to admit is that time travel into the past is impossible. But the future might be because of things like time dilation and stuff

[@AttackHelicopter64]

@@Jvlerah Or that "time traveling" has no affect on time traveler. You killed your grandpa - no problem, you come back to the world that doesn't know who you are

[@SophiesLoaf]

Here’s a better solution: if you manage to find a time machine, DONT KILL YOUR GRANDPA Boom solved

[@dixonyamada6969]

thats not a solution thats like handing your teacher a blank test paper

[@danzplayzlife5633]

What if your mother married another man (your father was not born becuase grandfather dead) and you are those couples offsprings. You just have different genetics and family (mother side still the same)

[@GGG-hh5jo]

I have a better solution: if you manage to find a time machine Kill your Grandpa after your father born Solve

[@yeastyyeasty2168]

+Sleekb but that would mean that the reason for going back in time no longer existed so you didnt go back in time meaning that there was a reason but when you complete the reason there is no reason and when there is no reason you dont do the reason and then you get a reason and then you do the reason SCIENCE!!!

[@lattjo1351]

You see different genetics = different person. Dumbass

[@vishnup.m4561]

Dormammu ,I've come to bargain

[@th3gov3rnm3nt]

SNAP out of it

[@ThomasIs_Tired]

@@th3gov3rnm3nt Mr StArK i DoNt FeEl So GoOd

[@vancados8609]

vishnu pm the hardest choices require the strongest will

[@aldopratama8974]

I can do this all day

[@SuPeR-mm9ls]

STOP ! make this stop ! set me free !

[@NafedalbiFilms]

“The solution is that he is alive and dead at the same time.” *BRUH*

[@josephclegg3562]

Half dead/half alive

[@ayushgurung9564]

@@garbage7927 Hmm. So there may be a superpositioned or looping reality where we have half life 3

[@garbage7927]

@@ayushgurung9564 Well this might be one of those if half life alyx is a success

[@mikuzi7035]

Jokes on you I thinked and solved this before this was discussed.

[@Tacticaviator7]

@@ayushgurung9564 Hey man if the universe is truly infinite there's an Earth where we have half-life X already!

[@cihloun]

So, it's like schreningers cat, except it's your grandfather

[@sumynona.01]

why has noone else brought this up

[@sumynona.01]

also its Schrödinger's cat

[@cihloun]

@@sumynona.01 oh thanks

[@shinysilverstardust]

1:11 well that escalated quickly.

[@pratiksadawana9334]

"Then your father and mother won't have been born" this isn't Alabama bro

[@soos4818]

?

[@friedrichkrone5141]

@@soos4818 when he Kills his Grandfather and then as a cause his mother and father die he suggests that they are Brother and sister and parents. Alabama shit

[@spthibault]

Lmmfao.... hahahaha... some here don't get it... oh I get it... but my thought was West Virginia or if you're British. Wales. Lmao

[@sylvia7961]

he said or

[@Rat_Fบcker]

Damn i didn't think about it

[@williamsfamily6211]

solution: you are now a murderer

[@champagnemoneyabuelo]

Achievement Unlocked! xD

[@SpykoYT]

Greg Williams solution nothing ever happens and it loops again and again unless some other time traveler comes and tells you you created a paradox

[@williamsfamily6211]

Gamerale2006 so if a random person tells you cool you just created science! you will stop murdering grandpas?

[@SpykoYT]

idk his choice he can either continue forever or realize the dumb mistake he made

[@picklemcgee2194]

If you killed your grandpa then wouldn't your grandma end up with someone different, which then ends up with your parents being different, which then in turn only makes you look like a different person then you were?

[@anmirfan6447]

I love how mathematician try to solve a problem that will be never be a problem.

[@ZacOchs]

The solution is that you become the grandfather

[@NoName-xxxxx]

Just like in Futurama

[@bambicandi6488]

The news is that you are, just like the single electron universe... consciousness splits while being a single one

[@MrYeast555]

ZJO_17 what if you were adopted tho

[@Ryan-nx6sy]

ZJO_17 wouldn’t work cuz you wouldn’t be born to do that

[@DevilleQueen]

Like Back to the Future gone wrong. You kill your grandfather and marry your grandmother.

[@starburst98]

but doesn't superposition collapse when it is observed? Schrodinger's cat, when unobserved it is alive and dead but when observed it must collapse into one of those states. so as soon as anyone observes you or your grandfather or anything in between the superposition would collapse.

[@markanonym9586]

This is just my take on the matter. Superposition collapses when it is observed from an outside system. That's why all experiments involving superposition (and quantum stuff in general) all have to be completely sealed off from the world - Earth's magnetic field is blocked, the temperature must be 0 Kelvin, etc. But in this case, the ENTIRE UNIVERSE is a quantum system. There is no outside to block, and we don't count as observing it because we are inside it. idk, my understanding of quantum (not quantum anything, just quantum) may be seriously flawed.

[@brittanyburns7714]

Mark Anonym Nah, dude, that's exactly what I was thinking. We'll never be able to observe from outside the system because we are in the system, therefore we can't choose one state that's the "true" state.

[@ananyaiyer334]

starburst98 Fair point, you got there.

[@aaronmicalowe]

It would be possible to observe from outside an infinite system if you knew in advance a test to know if you had successfully observed from outside an infinite system then created a perfect illusion that satisfied that test without changing the results. You might not ever be able to objectively prove this was true unless you could merge the subjective and objective and view the whole system from within that singularity. Anyone fancy a cookie?

[@aaronmicalowe]

Then at the point you exited the subjective/objective singularity your proof would only survive subjectively so you could never demonstrate it to anyone unless they ran the same experiment. Not sure that counts as science even if you could do it but not all knowledge is gained scientifically.

[@TheZALGOisCOMING]

The real answer is that you didn't actually kill your grandpa because you were adopted.

[@firekind1980]

+Behind TheWall Which is the reason you did kill him. No paradox.

[@toasty4000000]

+Behind TheWall Then you didnt kill your grandfather, you killed your guardian's father, so, not applicable

[@wobblysauce]

It was the neighbor all along.

[@josephclegg3562]

The adopted murderer. Lol!

[@Questiala124]

Making the grandfather paradox is just forming a closed shape in 4-dimensional space and pushing a dot through it until it finds the end. Since the shape is closed there’s no end of the line and therefore it goes around infinitely. I theorise this creates a secondary “sheet” of space time that’s simply all the area you existed in forming the paradox, then once a single loop has been made you erase the whole timeline and that causes the original space time to return and start the second timeline. So they exist separately like two lights that flicker after the other stops flickering.

[@grumpent]

And this how the show “Dark” was created

[@laraefm2781]

Young Grump love it

[@jelkehoofdmann9981]

I was waiting for this comment

[@martina-dd6vb]

I thought about Dark too 😂

[@houdini2598]

Was searching this comment.

[@DrShrimpPuertoRico_]

[SPOILER 3x08] Jonas is his own great-great-great-grandfather. Think about that

[@abdullahalshudukhi684]

Forget the video, He js sponsored by Google HOLY SHIT

[@abdullahalshudukhi684]

is*

[@Energyxxer]

+abdullah alshudukhi Yes, he is sponsored by the owners of the very platform he is uploading a sponsored video to.

[@amreladawy3784]

+Energyxxer That is Paradox

[@Hallieisntbritish]

+Amr ElAdawy No that's politics.

[@FrostyyAstro]

+Hallieisntbritish No, this is Patrick!

[@invictus8539]

Smol brain: what if we can time travel Big brain: but we are already time traveling, forward in time.

[@Ansh-bg3sm]

Lmao 😂

[@pinkajou656]

Yo man brain implosion

[@ankita19871]

I believe if it were possible to go back in time then we could be just an observer. We cannot change situations at all.

[@electrocubic5116]

Just like watching a recorded video you mean. You can just watch the events unfold in front of your eyes all over again.

[@219ms]

Captain America: I can do this all day Mister Doctor: I can do this forever

[@victorlimpearce1887]

You don't call someone Mr Doctor unless his first name is Doctor, which isn't in your case. He is Stephen Strange, Dr Strange' his name.

[@deformercr6680]

@@victorlimpearce1887 r/whoosh

[@victorlimpearce1887]

@@deformercr6680 woosh yourself

[@219ms]

@@victorlimpearce1887 did you even watch Dr. Strange?

[@dictatoroblitorator1115]

Captain, I've come to bargain

[@cireter8121]

I like to think of it like if you go back in time, something would always be stopping you from changing the future, because you would be the reason that the event you were trying to prevent from before you time traveled happened in the first place. Before you time traveled, your future self that already time traveled would be in your present time. For example, if someone was standing next to you and you time traveled, that person was just you from the future, so you would be standing next to your past self.

[@soheil5710]

So the Harry Potter version of time travel. Check out Minute Physics video on the topic!

[@Username-eq7fh]

I was doing homework and looked up us rivers and now I'm here... I'm so proud of myself

[@davewilliam5228]

Time Travelling Back In Time GuideLines 1. Wear clothes that are clothes from that time period. 2. Stand still in the past and watch history for 1 minute. 3. Hide the time travel machine in an area where no one would see time travel machine. 4. No talking to other people in the past. 5. No changing past event's.

[@Anonymous-hx3pu]

I always thought it would create a never ending time loop unless some outside force stopped you, like another time-traveller going back and killing you before you could go back in time.

[@The_Shimp]

And the other time traveller is your son…

[@copterinx0468]

This is essentially what the video says. Effectively, the loop and the alternate timeline theories are one and the same, and that is the solution to the paradox.

[@Rudxain]

This reminds me of Newton's laws of motion, also thermodynamics. But the "outside force" that breaks the loop must come from another timeline

[@brianl8481]

Unless, you become your own grandfather, like one Phillip J. Fry.

[@quantisedspace7047]

Yes, it could create a never ending time loop which alternates between two interlaced frames: in one you exist and in the other you don't. You don't perceive the ones where you don't exist, but everyone around you does, as a sort of 'average' of the two.

[@brandonhall6084]

Oh sure let's listen to what Mr. I'm-my-own-grandfather has to say.

[@grandpappy6037]

+Brandon Hall ENOS!!!!!!!!

[@afrofaust1913]

+Brandon Hall He starts off the video like: Let's pretend that it doesn't just create a new version of reality. Because that's boring. Then he goes through discussion superpositions... and concludes that it was never a paradox. WELL NO SHIT CAPTAIN GENIUS PANTS MAN YOU HAD TO PRETEND THERE WAS A PARADOX JUST TO MAKE THIS VIDEO

[@CupcakeDeity]

ah...so, he fucked his grandmother...reminds me of futurama

[@loganlope911]

fansworth"this time machine only goes forward, so you won't do something horrible like sleep with your own grandma" fry: I wouldn't wanna do that again

[@AyushMandowara_xx7]

+Brandon Hall Predestination :P

[@nuke2625]

When you realize that you killed your grandfather but you're still alive. 😂

[@deepak________]

😂

[@sretaravichandran2901]

Yeah. Sort of. Haha.

[@smartyd.9417]

nuclear kid Then you would say that this was a triumph

[@ProPlayHorizon]

Then you were ADOPTED the paradox says

[@Kellexyz]

😂😂😂

[@SydMountaineer]

I think this is the likely solution to not creating an alternate timeline if someone travelled back in time.

[@EugeneKhutoryansky]

I think that the proposal that the Universe is in a superposition of these two states is logically equivalent to the proposal that when you went backwards in time, you want into a parallel copy of our universe. After all, unlike quantum superposition which collapses when observed, the type of superposition proposed in this video for time travel would presumably never collapse.

[@NikhilRamakrishnan1]

When you say that they are logically equivalent, you imply that you successfully isolated the two states. Will you please explain how you arrived at the conclusion that these two states wouldn't collapse when you try to observe them individually?

[@chrisk8208]

+Physics Videos by Eugene Khutoryansky Yeah there would have to be one continuation of time (after you disappeared into the past) where you continued to exist (albeit in the past) and one where you didn't or you get a non resolving version where the two exist simultaneously and time endlessly loops.

[@NikhilRamakrishnan1]

Chris K What OP is trying to say is that when you time travel, the proposition that you will go to a time where both the time states are still superposed is equivalent to isolating a single state and entering it

[@chrisk8208]

+Nikhil Ramakrishnan Meh, that's not how I'm reading it. I think he's talking about two states that exist simultaneously and I think that without a dual dimension solution, time wouldn't continue to flow after the traveler left, it would just circulate endlessly. The dual "realities" can't be collapsed into one or the other (by observation or otherwise) without returning a paradox.

[@angelmendez-rivera351]

Nikhil Ramakrishnan Because for collapsing to occur, the observation must happen from outside the system. But there is no observing from the outside if the system is the universe itself. Therefore, the impossibility of observation implies the impossibility of collapse.

[@vyn0462]

*"Your Present Becomes your past and your past Becomes your Present"* -Hulk Endgame

[@joetroutt7425]

Emmit: see you in the future Marty: you mean the past Emmit: exactly Back to the future 3

[@vedanshbudhia8148]

Is everybody going to just ignore the picture of one direction at 0:04 it just pops for a frame and then disappears just after he says, " As far as we know, time only moves in one direction." I can't believe I'm the only one who noticed it.

[@alexp.2914]

Had to scroll way too far for this comment lmao (kinda reminded me of the glimpses of Brad Pitt at the beginning of the movie Fight Club)

[@abhisekhjana2557]

Yup

[@kaikakarot483]

Oh I have not noticed.

[@tammydoesstuff804]

No you're not

[@robieyee2867]

Been scrolling down looking for this comment.HAHA

[@leventeszipocs5260]

My favorite theory is that if you go back in time, you can't change the past events. Because what already happened has happened already. So if you would go back in time, you wouldn't be able to kill your grandfather, because the birth of your mother or father and you had already happened in the future. And actually, the future that the other people haven't seen yet, is your past already.

[@Prakhar281993]

Video appeared in my recommendation after watching Dark.

[@karishmasingh5260]

Same here man!

[@HiteshKumar-fo9dv]

It's Google that tracks us😂

[@akankshakushwaha6428]

Same

[@vinodakshat]

Same

[@chrismathew5204]

Tenet for me

[@gamingbraaa7698]

Your conclusion is just a polished/finished version of what you said at the start about the parallel universes, the only difference is that in what you said there are two states and in the other one Its infinite

[@gamingbraaa7698]

No offence tho good vid

[@yogeshdangi3253]

So true. Kept scratching my head to find out the difference in the first answer and final answer.

[@gamingbraaa7698]

@@yogeshdangi3253 well I'm glad its not just me

[@thanos6635]

Barry Allen... save me

[@anthonymartinez71604]

He only screws up the timeline so i would stay away from him

[@americancheese9103]

King Of Gaming I mean it made for a really cool villain for season 3 until he was revealed so I would go near him

[@oxxyjohny171]

Thanos lol

[@darkarmmedytgang877]

Actually I’m not allowed to do that anymore

[@Alphajet101]

Why do you say that? YOU HAVE THE TIME AND REALITY STONE!

[@raviexthegod]

I love how I just used this exact theory in an argument in the comments of a short trying to explain why this exact scenario plays out in a science based TV show I watch.

[@mfischrr614]

I have an easier and faster way to explain the video, Don't kill your grandfather.

[@Red_Lanterns_Rage]

my how the simple solution often evades us.....lolz

[@yasseindahshan3556]

I will have to ruin your explanation I will kill my grandfather.

[@Tigerbricks11]

How do you commit suicide without killing yourself then?

[@saswatibiswas6770]

NeonZ - Gotaio yeah much easier and way faster!

[@hayddenlykins3896]

That what I was thinking

[@ductuslupus87]

Did you really put a subliminal of one direction in your video?

[@AWWYEAHHHHHH]

Lol where

[@branthebrave]

0:03

[@Nimbus3690]

+Malcolm Pagett yes lol

[@snubRadar01]

Lol yeah

[@newexplorer6534]

😨😨😨

[@ShweezyHD]

Barry don't fuck up the timeline

[@tame3365]

Shahril Mozumder 😂😂

[@marlenafournier1824]

Shahril Mozumder I love this guy but that one liner...😏👏

[@ponyoblue5322]

Thats really ironic with the latest episodes theme of closed time loops.

[@KnakuanaRka]

So how would you trace the two timelines forwards from the loop? It sounds like the time-traveler from the timeline where they are alive would return to their own timeline where the murder never happened, while the other would continue on without grandfather or time traveler. I ask because I've heard of a similar story, but where the time-traveler went back to kill someone who killed their daughter; thus the time traveler exists in both timelines. Would the version of the time traveler who went back return to their own timeline where their daughter was still killed, while their counterpart from the timeline where the daughter was saved continues in their own timeline because they never went back?

[@mahaprasadrath]

Grandpa I've come to bargain. Thanks for 1k😇😇😇😇😎😎😎

[@mahaprasadrath]

@Guy Pursin not wasting time with u

[@leongrynerd6818]

This is gold

[@nolanwestrich2602]

And then Grandpa kills you 50 times.

[@mahaprasadrath]

@@nolanwestrich2602 well I wouldn't kill my grandpa though

[@theacademictaskmaster6481]

@@mahaprasadrath Mahaprasad Rath's grandpa: "Who are you?" Mahaprasad Rath: "I'm your grandson and I have come to erase my blood from existence" *BAM* *Mahaprasad Rath creates Universe B where he doesn't exist* Multiverse/many earths theory

[@Its_PaPez]

Today I learned about: Schroedinger's Grandpa

[@Mudkip971]

This is supposing that you weren't destined to go back in time and that you can change the past.

[@rgazsy8366]

Mudkip971 I agree. If time travel is possible then every thing that will happen, did happen and there is no free will and every thing that you can affect with it is why things already are. I think the original “Terminator” got it right where sending the machine into the past to stop something is the reason that it happened.

[@thedude8254]

Mudkip971 this is supposing destiny exists.

[@Mudkip971]

That's what I said.

[@brenxbux]

Mudkip971 the past would have already been changed?

[@Mudkip971]

No because maybe everything is destined meaning that even if could go back things couldn't be changed because you yourself were destined to not be able to change anything.

[@hirashrestha4429]

Wait I’m no scientist and this might be really dumb question but since everyone had two grandfather at some point, wouldn’t that be a second variable to the grandfather paradox?

[@tatertatertatertatertater]

I have another solution: The universe decides "Fuck this shit I'm out" and proceeds to spontaneously combust

[@pedropedrohan102]

ah so a black hole would be created

[@ruth8964]

Plot twist, you were adopted.

[@josephclegg3562]

But what if your grandfather and father were adopted?

[@shivasurya7008]

Plot twist: u copied the top comment

[@gametrue2229]

Plot twist: you were a mistake

[@legendzfilms4409]

@@josephclegg3562 by different parents

[@averyhennessey7104]

lmao

[@oxenford539]

Even if killing your grandfather did result in you never being born, it wouldn't matter anyway. The universe wouldn't discriminate over your matter existing at the point in time where you killed your grandfather, so you'd continue to exist. The only implication would be that, if you were to return to your normal time, nobody would remember you as, indeed, the footprint you'd left would have been removed. Think of yourself as a shoe. Your life up until the point that you traveled back in time is like a footprint left by the shoe; your birth, the memories of you that are held by others, any impact you'd have made through your existence in that time period. That footprint would be wiped away, but the universe wouldn't discriminate over the shoe that left those footprints being present in the past. A shoe, like our bodies, is just matter. The memories we have, as a result of how our brains work, aren't reliant on things actually having happened (as evidenced by false memories). Both the matter that makes up your body, and your memories, would continue to exist in the present you're experiencing.

[@kidslovesatan]

The paradox is that the events leading up to your existence didn't occur. If the universe doesn't discriminate then you should not be treated any differently to any other event that was prevented. So the matter making up your body is no longer making up your body. You're making an exception with the time traveller not being affected by causality.

[@cdmaster35]

You already left the point in time you originated from so why would that matter? Everything you do in the past affects the future, but you aren't in the future, you're in the past. Why do you assume that time has to retroactively erase you? To preserve the timeline of events? Why would the universe give a fuck about the order the events occurred in? The matter that makes your body went back in time, so you exist in the past now regardless of what happens.

[@oxenford539]

Cancer Master Thank you!! Finally somebody else who sees this.

[@kidslovesatan]

Nope, you're from the future. The events that lead to you traveling back in time no longer exist and the universe gives quite a big fuck about causality.

[@oxenford539]

kidslovesatan The future wouldn't have happened yet though. The universe wouldn't just erase your presence due to the future where you were, or weren't born hasn't happened yet.

[@lifeiscats1337]

You: *goes back in time to kill your grandfather* Also you: *survives* -WAIT A MINUTE HOLD IT! I JUST HAD A FUCKING BRUH MOMENT!!

[@raspic2838]

okay i can understand this video 1:11 Nevermind

[@superleipoman]

+Raspic I marginally understand that superpositions exist and such things but I would really like to know more about the proof of going back in time to be impossible as they presented it. An example of superposition reasoning is Schrodingers cat, who is also both death and alive at the same time.

[@BulletsToBrainRatio]

+Raspic The loop just loops on forever maybe, I don't understand this because relating it to a superposition makes no sense when we observe the event....

[@jasvinjames5773]

+Hybrid Rainbow We observe the event sure, but the name's quantum superposition and this is definitely not "quantum". This may be something like 'time superpostition', (not a cool name i know, but i just made it up right now so theres that) Also to the person asking y there's no time travelling to the past i actually dont know for sure but heres some proposed methods, using Wormholes (nearly impossible), using Alcubierre Warp Drives (nearly impossible), i dont know how all of this works, just wikipedia it. But moving forward in time... Now we're getting somewhere, thats really easy but you need a lot of speed, 10% speed of light could provide significant time dilation. Again wikipedia it, or watch Interstellar, that movie is awesome

[@jasvinjames5773]

+Jasvin James You know the wormhole way to travel back in time, a person named 'radekzOL' perfectly explained the way just a few comment threads below.

[@Maladringe666]

+Hybrid Rainbow Exactly. People outside the reference frame are going to have some history, either that lineage exists or it doesn't exist. But if we use the superposition idea then everyone else experiences both the lineage existing and not existing at the same time. So if we use super position than we have to go back to the fact that two realities exist, because the super position wouldn't make sense in one solitary realm of existence. I am probably missing something and could be completely wrong, I am no physicists.

[@saurabhmahra4084]

I am sure the creators of Doraemon were the first to discover it.

[@NotaPlagueDoctor300]

Bruh yes

[@hellothere3286]

Oh yes

[@chaitanayanathalia2480]

lol

[@fishplayztoh]

Lol

[@alexandrochristianwijaya4408]

Yess, i like the analogy from doraemon that you can reach the same destination (you are born) with different vehicle.

[@ic7saysglazersout176]

0:31 Ayo hol up did this man just start a love affair with his own grandmother

[@years8703]

Oh heck nooooo

[@theprotagonist2544]

*mother

[@smth.something]

How about these cookies, sugar?

[@op_sagnik]

That's such a good explanation bro. Loved it truly. Everything's clear by now. ❤️❤️❤️

[@davewilliam5228]

Grandfather Paradox State's that person builds time travel machine. Person travels back in time. Person kills his younger grandfather before his younger grandfather meets his younger grandmother. Father is not born and baby person is not born. Person is not travelling back in time.