Solution to the Grandfather Paradox
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- Опубліковано 12 тра 2016
- What if you went back in time and killed your own grandfather? Would you still be born? Or would you have thus killed yourself? Thanks to Google #sciencegoals for sponsoring this video!
Link to the previous MinutePhysics video: • Solution to the Grandf...
If you could travel back in time, and you killed your grandfather, would you be killing your future self? What do physics, complexity theory, and computer science have to say about this famous murderous time-travel paradox?
Scott Aaronson Notes that discuss time travel and computation, computational complexity, closed timelike curves, and the grandfather paradox: www.scottaaronson.com/democrit...
Technical paper that discusses the same thing: arxiv.org/abs/quant-ph/0502072
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They always say "What if you killed your Grandfather"
But they never say "Why would you kill your Grandfather"
😔
Reality is often disappointing 😔
Hmm..."How would you kill your Grandfather"..
Just saying...
*_Why not?_*
Well, for example if you realized your original family name was Hitler :D
The easy answer: Two timelines
The hard answer: this video
The complicated lore answer: You ARE your grandfather
Good one
What?
@@obviously1429 Futurama, that's what.
“I did do the nasty in the past-y”
what if i was a test tube baby?
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.
After 20 minutes of reading the comments i think this solution is the best one yet
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.
@@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.
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.
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.
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.
@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.
@@stardrake691 No, you wouldn't have a choice. That means that you would think about it and decide to create it eventually.
So you just really can't break through it?
@@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.
@@SillySyrup ohh
This would be the worst way to find out you were adopted.
One of the cleverest comments 😂.
@@neatchip123 oxidation reduction need add complex law theory physics
Lmao
😂😂😂
Lmao
Someone complained about something about this comment, now no one shall know what it originally was
haljoa fuck this is genius
*slow clap
*insert funny pun here*
he wouldnt be killing his own grandfather then right?
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.
Another solution: each time you travel to the past, your grandfather is moved to the future.
Wait shit thats genius-
WELL IMMA KILL MA DAD
Wait wha-
That's kinda just the multiverse explanation though
Wait i didn't get it what ?!
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.
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.
@@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.
_brain.exe has stopped working_
lolllll
+TheGamerMan757 Have you tried turning it off and turning it on?
Mind blows up like the Death Star
+TheGamerMan757 "Process BRAIN.DLL halted unexpectedly"
I get that error a lot on these videos. Still waiting for a patch :(
+TheGamerMan757 reloads brain.exe and uploads understanding.exe to brain.exe and saves brain.exe
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
lol
This comment will have me laughing for days.
L O A D I N G...brb after 10 years
lol
lool
You can't go back in time, you can only go forward.
well actually in the ringluraty basically a singularity but a ring in a spinning black hole alows infinite speed ftl makes time travel
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
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.
4. You're adopted
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.
It doesn't create a paradox, it just makes you a shitty grandchild
@@hasnaindevyou really gave a generic explanation without considering any time travel or time
Solution: *Why the fuck would you kill your grandfather?*
Rohanjeet Das memes
Chutiya sala
Perhaps the grandfather acted badly to you.
Rohanjeet Das Yh xD
Rohanjeet Das for the lols
After watching tenet, youtube recommends grandfather paradox.
Yeah😂
Same here😂
Yea youtube knows maybe u have wached tenet explained videos om ytb and the alghoritm knows what u wach and recomends this video
Same
Same here
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.
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.
@@electrocubic5116I think it would just remain the same. Like you would age at the same rate
Another Paradox: If Pinnochio said "My nose will grow now", What happens?
his nose grows after an amount of time, so the 'now' part is false but the nose still grows
@@jan_Masilijun What about "My nose will grow soon"?
@@Nathan-qq3mt his nose grows after a very long amount of time
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.
GrandFather is dead and alive at the same time,
Schrödinger's CAT : Ah Shit, Here we go again!
Finally a worthy opponent
:(:
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🤔
@@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).
Watch Dark ,, you can understand it ,,
I was explaining this to my friend and his grandfather walked in🤦🏻♂️
I know you are lying son, don't worry your secret is safe with me
@@omega-man1736 😂
Lol
Kill the grandfather
Awkward!
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.
You know you’re old when a small kid shoots you saying you’re his grandad.
I love how the mathematicians try to solve a problem that isn't even possible
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.
@@jhwhthemerciful my man gotta guess when hes gonna die
Time travel is possible according to the laws of physics
Ne Dom activities
@@jhwhthemerciful that's a weak paradox and more of an inconvenience
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
Yay summer!
Haha! Fuck you school (even though you're a privilege and I do enjoy you quite a lot at times but still fuck you)
you're god damn right!
DerpMonsterProductions h
DerpMonsterProductions i
That's such a good explanation bro. Loved it truly. Everything's clear by now. ❤️❤️❤️
Heck man, you explained this so much better than I could!
Just call it, Schrodinger's Grandfather.
I thought i was the only one....
ya thought of that myself today.....gdaddy exists and doesn't :)
Soham Dutta grandpa is both alive and dead but when you check him which outcome is it
appart for Shrödingers Cat not working like this... sure
"Back in my day, we existed in only one time loop, forward through time both ways, and we didn't complain!"
solution:
you are now a murderer
Achievement Unlocked! xD
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
Gamerale2006 so if a random person tells you cool you just created science! you will stop murdering grandpas?
idk his choice he can either continue forever or realize the dumb mistake he made
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?
I've already solved this theory, it took me 2 weeks to solve actually, and now i am planning write an article about it, great video btw👍
Your right. The correct ways to solve paradoxes is redefining the possibilities of reality. Kind of like how the alternative timeline solution does. That you said is just avoiding it.
This is what Avengers Endgame was trying to do
Yo was waiting for this comment
@@user-cy5hz6tj9c i think dragon ball z used similer concept.where you can't change the past..
@@user-cy5hz6tj9c Endgame established going out of the grand father paradox by creating an alternate reality. Loved it
Endgame use Multiverse concept instead of this “Back to The Future” concept
They should've brought Tony back with the gauntlet. But contracts or whatever
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
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
That is the plot of a great Science fiction short story by Alfred Bester, titled "The Men Who Murdered Mohammed." I highly recommend it.
like when flash goes back in time to stop himself going back in time and saving his mother's life.
Also "Primer" is another great movie with similar intricated scenario
yup, was done in the show called the flash
So, it's like schreningers cat, except it's your grandfather
why has noone else brought this up
also its Schrödinger's cat
@@theanomynusguy oh thanks
There's also something, if we're talking about possibilities of abstract concepts, about predestination. That fate destined you to be born to perform the task in order to preserve the flow of time, stating that you were meant to be born, whether into one family or another. Not to suggest that time and space are sentient entities or anything but rather that time flows like a river and moves in the same direction and with the same purpose regardless of the obstacles put in its path. However, predestination is a wholly different topic and really spits in the face of a lot of known sciences so it doesn't really gain any traction... but it would be a simple resolution to a paradox like this.
This guy messed with my brain for 2 minutes and 48 seconds straight.
Even the Google supporting at the end?
Really? For me it was. Really interesting
hey look at my dp
You haven't seen "dark" have you?
no only 2min and 47 seconds😁
anvengers endgame writers: “write that down, write that down!”
Nah, in endgame it was the complete opposite
Endgame's time travel was shit and full of plot holes
@@jayyadav1610 It wasn't shit if u learn Deutsch's Parallel Universe !
@@dafuanisnothere cap gets old.
@@bintangtrawijaya6460 It's kind of complicated, he have broke the science.
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..
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
@@Broc_Obama 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
I fully understood the solution you gave to the paradox, it is hard to explain to any person in words but I understood it
I went back in time to kill my neighbor but I started dissapearing from the timeline.
Its impossible. You won’t die at all. Didn’t you understand the beginning of the video? The grandfather paradox is wrong.
@@AceDeclan r/woooosh
@@AceDeclan oh ok
I get your gist. But that is nasty.....
Daltira I think your just trying to cover up your stupidity
He says alternate timelines are boring as a solution and he won't do it, then he goes on to explain an alternate timeline.
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 .
What's up with all this people with letters has their youtube image?!!?
João Miguel
If you do not have an image thumbnail, Google+ will take the first letter of your username and use that instead.
+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).
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...
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.
So would the universe break or what
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?
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.
Yeah I like this one too, have heard of it! Thanks for reminding me! 😀👍
Like in Harry Potter and the prisoner of Azkaban.
@@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.
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.
@@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.
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.
yesyesyes
+MetaKnight68 Sounds like that sentence got away from you..
Chronos too stronk :D
😍
and listen.. dont turn your back, dont look away and dont blink
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?
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?
Forget the video, He js sponsored by Google HOLY SHIT
is*
+abdullah alshudukhi Yes, he is sponsored by the owners of the very platform he is uploading a sponsored video to.
+Energyxxer
That is Paradox
+Amr ElAdawy No that's politics.
+Hallieisntbritish No, this is Patrick!
Him: But that's just avoiding the paradox
Also him: By the way there is no paradox MOVING ON
Exactly 😂
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.
@@giovannitorres9337 no (to the superposition is creating a second timeline), it depends on the interpretation
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???
If it wasn’t for back to the future we wouldn’t know if we actually made an alternate timeline at all
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.
My brain is melting
Same
+Vegeta
You should borrow Bulma's time machine and test this paradox yourself
Exploding*
Trying to Google my brain, but instead found this:
error 404: Not Found!
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??
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.
Yeah... There is a even physics theory that it is impossible to do something in the past that affects and changes the future.
Like the movie Alice through looking glass
Harry Potter, Game of thrones, Dark all follows the same time travel theories.
It's called the bootstrap paradox
@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
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.
Most meaningful few minutes of my day today
TENET people what’s up
Ayyyyu
Wazzzup
I did not understand that movie at all
@@Titankiller-fz4tn it's not as complicated as Dark...
@@Titankiller-fz4tn me either
Me seeing the beginning: hmm ok simple
Looks away for 1 second: ***quantum physics***
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
Second question, if say your in a fixed timeline where you are bound to be born even in the case where your grandfather dies by your hand would you than just end up killing multiple different people or killing your grandfather at earlier and earlier points in their life?
I love how mathematician try to solve a problem that will be never be a problem.
"Time only moves in one direction." *Flashes picture of the band called One Direction*
Underrated
Lmao I was looking for this
*c r i n g e*
I thought I was hallucinating
just goona type this
At the end of the video, did that guy look backwards to see if his future grandson was chasing him with a knife?
+fljpopguy Funny!
+fljpopguy also the predator sound was heard in the background. or a woodpecker, they do sound similar, but it was most probably a predator.
While this video was being recorded, grandchildren out there were planning on traveling back in time to kill their grandfather.
I think Back to the Future 2 handles it best in a most understandable way. When Biff gives himself the sports almanac, it does create an alternate timeline, yet still affects the lives of Doc and Marty when they go back to the present day. The time machine naturally takes them to the present along the skewed alternate timeline. So to the time machine, affecting the past changes the present because the time machine didn't have to choose which timeline's 1985 to bring them to. It naturally brought them to the present that was affected by the change in the past, and likewise, if they traveled to the future like Doc said, it would've been the future of the alternate timeline. Yet it is also an alternate timeline for our characters because they are from the other timeline with the memories and experiences from the other timeline
The thing about super position is, it is only possible as long as it's not observed. The moment you gain consciousness in this theory you become the observer thus destroying the super position and going back into the paradox.
In my opinion there are only 2 possible scenarios. One is as you said you don't go back in your own time but the universe splits up and you influence a timeline that you don't originate from. Or if you want to go actually back in time in this universe you have to literally reverse time/make every molecule in this universe go the exact same way back as it cane for as long as you want and then, only then if you manage to break physic and make every particle in the universe, EXCEPT YOURS go back in space you can move to another point in time thus killing your grandfather. The results will be that you as an adult exist in a world that will be different from the world you used to know by only one factor: your family line. It will not impact you because you have already freed yourself from the laws of the universe and you will continue to exist in this new world as a independent variable.
In both scenarios the outcome will basically be the same because you are independent from the rest of the universe but because that is impossible in the first place with the exact same reason as time traveling into the past it doesn't matter anyway
okay i can understand this video
1:11 Nevermind
+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.
+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....
+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
+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.
+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.
Polt Twist: your grandmother had an affair that's how your father Born.
Knowing this after killing you Grandpa: "WASTED"
Underrated 😂👌
Or what if when you go to kill him you get hit by a car and so you can't kill him anymore? :))))
I dont wanna be that guy but...
Polt
@Justin Y? My god how do you guys even come up with this kind of speech skills
@Justin Y? why are u everywhere
It took me a few times going over the paradox to actually get it and it's mind boggling 🤯
"Time only moves in 1 direction"
*shows 1 direction*
0:04
@@dokidoki6094 why is it called a second? Hmmmmm
@@dokidoki6094 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.
@@dokidoki6094 Fair enough. My interplay was more into the symetrics of reasoning based on given linguistics.
I swear lmao
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.
hey bro. i think i got the answer. just say if you wanna hear it.
@@noahishy4158 I’d love to
@@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?
"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
@@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.
The issue with causal loops in sci-fi is always "it happens because it always happened". But that catalyst or motivation or object always has to be introduced to the loop. If I give my future self my cell phone because my past self gave me _their_ cell phone, the phone had to originate somewhere. Same goes for the motivation of why you're acting out of character, or taking a drastic action.
The history of time travel movie on Amazon is pretty interesting. It was presented as a documentary, but it’s a fun fiction. If you watch it, keep an eye on the maps in the background, the territory’s keep changing because someone is constantly going back in time and altering the present
Barry don't fuck up the timeline
Shahril Mozumder 😂😂
Shahril Mozumder I love this guy but that one liner...😏👏
Thats really ironic with the latest episodes theme of closed time loops.
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.
Wibbly wobbly
+Tesla Foil Timey Wimey
+AlphaWolf28 Stuff
+Dlee645 dumbass
+Baked potato 420 It's a quote...
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.
If one ventures into the past and disrupts the chain of events leading to their own birth, it creates a divergence, a splintering of timelines. The act of eliminating the grandfather results not in self-annihilation but rather in the emergence of an alternate reality where the individual still exists. This aligns with a metaphysical interpretation that suggests the unfolding of multiple possibilities coexisting in a complex temporal tapestry.
Time Paradox: (exists)
Netflix Dark : Let us introduce ourselves
.ereht olleH :teneT
Sic Mundus Creates Est
@@theouts1der *Sic Mundus Creatus est
Or the movie “Predestination “.
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
Science teachers: the test won’t be that hard!
The test:
Underrated comment
@@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
@@SaberSimp69 This!
@@ananttiwari1337 eh sorry I made the wrong reply
@@SaberSimp69 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.
That millisecond 1 Direction edit was GOLD
I believe if it were possible to go back in time then we could be just an observer. We cannot change situations at all.
Just like watching a recorded video you mean. You can just watch the events unfold in front of your eyes all over again.
So u mean,
*_YES BUT ACTUALLY NO._*
Yeah that pretty much sums it up.
Yes, but actually no
it is not a paradox , but it is impossible .
@oH well,lord! when wormhole is actived gravity is too strong
Schrodinger: yed
War machine had an idea to go to the past and kill baby thanos
UA-cam algorithm got us here...
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
It just creates a parrallel time line
It just creates alternative reality so they had to take stones and bring them to their reality
Just Another Viewer h
well for me I think this way. the events are function of time only so at a given point of time, if an event has happened, that means that can be changed anymore. but when that event is happening, now if time travel is possible from future to past, can be influenced by both past and future of any time. generally it happens that an event is influenced only by the state of that just before time before the event takes place. so now when that event happens, it was already influenced from all time whoever influenced. it means that if you went to the past from future, then it already happened at that time. by going to the past, you are not changing anything but just doing what already happened.
me : kills grand father
Grand father : dead
Me : still alive
THIS IS THE WROST WAY TO REALIZE THAT YOU ARE ADOPTED
"Then your father and mother won't have been born" this isn't Alabama bro
?
@@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
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
he said or
Damn i didn't think about it
Barry fucking stop now
MEØW hahaha thinking the same thing😂😂
MEØW 😂😂😂
MEØW Screw Zoom
LOL
IN4C10 //3 screw savitar
I love the mobius strip explanation lol, mobius strip has only one surface but we have two different situations going on simultaneously
In the theory of quantum mechanics, it is possible for a system to exist in multiple states simultaneously, known as a quantum superposition. This phenomenon has been observed at the subatomic level and has been used to explain a range of phenomena, as you mentioned. However, we so not know whether or not quantum superpositions can exist at larger scales, such as the scale of human beings or even entire universes.
Furthermore, the concept of quantum superposition is based on the principles of quantum mechanics, which describe the behavior of particles on a very small scale. We don't know how these principles would apply to macroscopic objects or events, such as the life or death of a person.
Did you really put a subliminal of one direction in your video?
Lol where
0:03
+Malcolm Pagett yes lol
Lol yeah
😨😨😨
That one direction band picture in the beginning though...
I paused at the exact moment this showed
Lol
Lol he says direction
@@ozancanca9740 *one direction.
Listen carefully
what
The best solution I came across was in a fantastic time travel book. In it, the narrator explained that Time doesn't care about paradoxes. You go back, kill your grandfather, go back to the present, and everything else is still there, except without your grandfather.
In a way it makes sense, since both time, as we can conceive of it, and the existence of the universe, are paradoxes. For the universe, either everything was created from nothing (impossible), or the matter needed to create the universe always existed (also impossible).
And what exactly was going on before Time started? Time either has starting point (seemingly impossible, in any sense of time that my brain can comprehend) or goes back forever (definitely impossible).
Time doesn't exist, we just made it up to connect our memories with the fact that we get older and die
Is it just me, or do these videos never actually answer the question?
yea they don't tbh, they give an answer that could be one for the question. But you have to realize that there is more than one answer to these types of questions.
He had to be a genius to answer this paradox
they did answer the question, but by making references to particles and waves. If you haven't studied these you wouldn't really get it.
BardicLiving no its just your stupidity
so...before you go back in time and kill your grandfather,everything is normal,your grandfather meets your grandmother,makes a baby(your mother or your father)as a result,you are born so theoretically you are able to go back in time,right?now,you go back in time,kill your young grandfather then your parents never existed thus you never existed but,THE GRANDFATHER STAYS DEATH,because death is death and is not related to any of you and any of your action either you kill him with your bare hands or you use a weapon of some kind.so what is done is done at the point you done it.like perfect murder...who killed him?no one,like really no one
The solution is that you become the grandfather
Just like in Futurama
The news is that you are, just like the single electron universe... consciousness splits while being a single one
ZJO_17 what if you were adopted tho
ZJO_17 wouldn’t work cuz you wouldn’t be born to do that
Like Back to the Future gone wrong. You kill your grandfather and marry your grandmother.
If you were to quantum superposition time travel to the past and kill your grandfather, the speed at which you travel would far exceed the flow of time, meaning that while your grandfather's death would take place instantaneously, the events following his death would occur at a normal rate. As a result, the changes resulting from his death would most likely never catch up to you once you return to the present instantaneously
I’m not gonna lie, I actually really like this theory :)
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.
The real answer is that you didn't actually kill your grandpa because you were adopted.
+Behind TheWall Which is the reason you did kill him. No paradox.
+Behind TheWall Then you didnt kill your grandfather, you killed your guardian's father, so, not applicable
It was the neighbor all along.
The adopted murderer. Lol!
Btw why would anyone want to kill their grandfather anyways?
Hank Hill lol
To suicide without suiciding.
Hank Hill Ha
Redz The Soulless Hater lmao
i have a gun in my holster, and my invention stored away in my pocket. just a quick visit to grandpa with the parents. but the parents, after a little while, go outside for some reason. grandpa looks at me. he smiles. i am slightly uncomfortable. grandpa stands up from the chair and puts his hands on my shoulders. "just let this happen like your daddy did." i am shocked, and silent. grandpa's hands move to my waist. my jeans are unbuttoned and taken off. grandpa takes out his firm cock. my thoughts get over me, and i grab my gun and turn around. seeing grandpa unclothed made me begin to get erect, but i could not let this happen. right before i pull the trigger, grandpa's erect stick of justice touches the invention. i teleport years back to when my grandpa is a child. i appear with my half erect pleasure and pull the trigger, killing little grandpa, last thing he sees being my half-chub.
*kills grandfather*
“Wait. Why am I not dead? Wait *NOO-“*
Reminds me of the film back to the future, when the old biff goes back in time to give the young biff that book, how did he then come back to the future where marty and doc where (he broke his walking stick)...
The old biff changed the past to change his future, but he didn't change
The wording of Grandfather paradox is itself a paradox, because it says "kill your grandfather", but that wrong. It should be "attempt to kill your grandfather", as there is no way for the probability of successfully killing your grandfather to be 1. If anything, in a single timeline context, the probability of killing your grandfather would be 0, as your existence is proof that you failed to kill your grandfather.
you got it right on the target
yup
+FireFox Exactly, quantum mechanics is based on probability. You'd always fail to truly kill your grandpa cuss the info in your brain in conserved (conservation of energy) and needed for you to kill your grandfather in the 1st place. It's only a contradiction when you assume the info necessary to kill your grandfather is destroyed by killing him. If you lack the info to kill him then there's still no contradiction because you lack the requirement to kill him.
...or the man you did kill turned out to NOT be your grandfather.
+Matt B
Or he was going to be your grandfather, if you hadn't gone back in time... but before you managed to kill him, your grandmother took notice of you, seduced you, and you unknowingly became your OWN grandfather...
“The solution is that he is alive and dead at the same time.”
*BRUH*
Half dead/half alive
@@garbage7927 Hmm. So there may be a superpositioned or looping reality where we have half life 3
@@ayushgurung9564 Well this might be one of those if half life alyx is a success
Jokes on you I thinked and solved this before this was discussed.
@@ayushgurung9564 Hey man if the universe is truly infinite there's an Earth where we have half-life X already!
I think Orson Scott Card had it right in his novel Pastwatch: cause always precedes effect, and time only moves forward. A time traveller going back in time is an exception to that, and becomes what he calls an "uncaused causer" (a phrase borrowed from the bible IIRC). What that means in the context of the paradox posed here: a time traveller goes back in time and kills his own grandparent. And time moves forward. His mum or dad is not born, he is not born himself, so the timeline going forward will not have him in it... except for the "copy" that was inserted into the timeline by time travel, wholly unexplained ( "uncaused") to casual observers. The cause for the time traveller's existence is erased because of the murder of his grandparent, but the time traveller himself is not erased because cause must precede effect, and there is nothing in his *past* that causes him to be erased.
It’s not a paradox but the closed time loop would still be a problem because it would mean the whole universe is stuck in looping that timespan for eternity and that would effectively end the universe.
But what would happen if you kill you grandfather to create a loop and then travel to the future again to a point after you started the time loop? Is there even a future to travel to if the universe is stuck in a time loop?
everyone is rushing to comment how their brains melted. That's probably because of 0:03. So subtle, MinutePhysics
+Jonar K That was sneaky.
+Jonar K Nice pun there.
+Jonar K What was that a picture of? I probably should know, but I don't
+Sterling Muse one direction (the band)
+Ryan Hu Well now I feel stupid XD Thanks