Grandfather Paradox: Explained in Simple Words

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The grandfather paradox is considered the biggest, most popular objection to the logical possibility of backwards time travel. It characterizes a hypothetical situation in which a time traveller goes to their past and ends up causing an event (like, the killing of their grandfather) which makes travelling to the past and altering it impossible.
What this means is that if you go back in time and kill your grandfather, you don’t exist, which means that your grandfather cannot be killed. As you can see, there are two realities occurring in parallel here. The grandfather paradox is also a key plot element in the famous Hollywood movie Tenet (released in 2020), directed by Christopher Nolan.
Although all this talk about time travel and the grandfather paradox is obviously purely hypothetical, there is evidence of two realities occurring in parallel at the same time. This is a phenomenon in the quantum world which is known as superposition.
Table of Content:
Intro: 0:00
The Problem of travelling to the past: 0:49
What's the Grandfather paradox: 1:10
What is superposition: 3:16
Is travelling to the past possible?: 3:45
#science #animation #grandfatherparadox
Quantum Entanglement Video link: • Quantum Entanglement: ...
References:
plato.stanford.edu/entries/ti...
people.bu.edu/pbokulic/papers/...
physics.berkeley.edu/news-eve...
ffden-2.phys.uaf.edu/webproj/2...
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17 май 2024

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Комментарии : 222

@ms.miwitdatbul520 3 года назад

I loved both my grand -fathers so problem solved.

@Scienceabc 3 года назад

Neat!

@MrJamiez 2 года назад

"loved" that's the keyword here loved. Means not anymore.

@arfarfarfarf123 2 года назад

If your i.q is high you know the answers that suggest then dont kill your grandfather is a low i.q answer why? That's the purpose of the grandfather paradox to explain in so simple term that time travel is imposibble in a way that you can change anything. Unless the one you can time travel to is not your dimension/timeline. Gets??

@rajnishrivastava4919 Год назад

both grandfathers Where's grandmother

@adam46221 11 месяцев назад

Yea i used to love my g parents

@little_cheezers6791 3 года назад

Thanks dude gonna go visit my grandfather!

@blspot 2 года назад

Hypothetically when I travel in time it would create a divergent timeline, rather than my own past, technically I am not shooting my grandfather but a mirror universe version of my grandfather, hence creating the mirror version of my past self to never be born , but my reality would still exists. This also justifies that time can always move in a single direction

@glemon9574 2 года назад

Have ya been watchin the flash?

@siuuuuuuuu9985 2 года назад

@@glemon9574 yes

@thatoneguy611 Год назад

Yeah but that’s boring.

@StephenWong14 Год назад

Technically this is not time travel. This is travelling to a universe which by coincidence looks very similar to our universe.

@hoodpimp1519 8 месяцев назад

Personally i think this whole paradox is a waste of time.A total waste of time because going back in time before you were born makes the whole rest of the concept irrelevant because you cant go back to where you never been…

@paulm5443 Год назад

The solution to time travel paradoxes could be seen through the many worlds idea. If you travel back in time you now exist in a different world and your future from that point on is yet to unfold. The time/place you travelled from still exists but is a different world, it just shares the same history up to the point you travelled back to. If you go back and kill your grandfather two worlds now exist. The one with you and your grandfather (alive or dead but not murdered) and the world where you exist having just killed your grandfather. Where this idea gets a bit difficult is if you go back in time and watch your mother give birth to yourself you are now in a world with two humans sharing the same dna and exact features. A bit like identical twins but with massive age differences.

@M.C.Escher2018 2 месяца назад

You give me the name of the person and at what time? NO one in history ever said "I declare acknowledge a grandfather paradox. No one said they were reasonable or tested it by experiment. Yes this this would have merit if some one in history ever said I thought of the grandfather paradox in the first place.

@paulm5443 2 месяца назад

@@M.C.Escher2018 my whole comment has absolutely no scientific merit, it was just meant to be a 'complex' idea. Here's another thought; what if the person going back in time is left with no memories of their time slip or maybe is given some other memory regarding their past.

@alphadawg7360 2 года назад

This helped me understand a little bit more about tenet. Thanks

@agentsbf969 3 года назад

Tenet probably had the most gruesome explanation of it.

@kushaltiwari3668 9 месяцев назад

And what was it? ( I have seen the movie tho)

@petericaza938 8 месяцев назад

@@kushaltiwari3668your always moving forward in time from your perspective

@behcherry9815 Год назад

Grade 9 I came to the same conclusion. I didn’t know the paradox was already named It’s getting harder every day to invent or come up with something new to name myself

@KLT47B 2 года назад

Very cool videos! Keep it going

@behcherry9815 Год назад

Great videos, thank you

@user-jt6ej7vh2p 3 года назад

TENET 🧠💥

@AtharviChevale-ev6tx Год назад

What a concept of Superposition, it will be awesome to know the parallel coexist of our world it is fabulous

@chloeblankenship2713 Год назад

I'm watching The Umbrella Academy Season 3 and had to look this up 🤔

@ceemontana5877 Год назад

lol. Me too.

@ShaggyJ1000 Год назад

I’m literally doing that right now lol

@infinityinfinity1712 3 года назад

Me: kills grandfather . . Also me: wait shit I forgot to time travel

@alphadawg7360 2 года назад

💀

@gopalakrishnagk7979 2 года назад

knock knock who is there FBI

@tirpitz19 2 года назад

Time travel is an impossibility of course,but we humans love the subject,cuz it give us endless wonderful stories about time travel.

@dreamwork69 Год назад

Nothing is impossible. Imagine people back then say flying is impossible. Now we have planes and spacecrafts 🤷‍♂️

@valevisa8429 Год назад

@@dreamwork69 There are rules in this universe we can not bend.Yes,we can watch the light of a star coming from the past,but physically time travel is an impossibility. We have present,past and future.When present becomes past,it's forever gone,we can see this on earth too well.

@StephenWong14 Год назад

@@dreamwork69 Don't confuse physical and logical impossibility. Unless we change the definition of time, time travelling to the past is logically impossible.

@michaelrouse1358 3 года назад

going back in time is like running on a beach with the tide coming in washing away your footprints.you can can back to where you roughly left. But your footprints have gone FOREVER.So everything you know will not exist,and you will not even recognise the same earth.you would have back to another multiworld earth.

@davewilliam5228 2 месяца назад

How To Travel Back In Time 1. Use the digital clock to make the digital clock one hour backward. 2. Use the digital clock to make the digital clock two hours backward. 3. Use the digital clock to make the digital clock go three hours backwards.

@lovingbomee 2 года назад

thank you for this video. you make it a lot easier for me (with a little knowledge) to understand the universe. :)

@Scienceabc 2 года назад

Glad you liked it ☺️

@ashwiniravi9299 3 года назад

Very very helpful I wish u do more and get to 1mil this helps my kids I tell them to watch u and learn from u

@jesuszues3820 2 года назад

I believe time is a circle around every individual thing and our circles connect as we move in the same direction but we have different "times" but also im high so...theres that

@varshanrockzz6358 3 года назад

Reallly goood ❤

@StephenWong14 Год назад

Grandfather paradox is only an easier to understand example. There would be paradox as long as history has been changed. History is not limited to major events which we care about, but also trivial microscopic events like the specific location of a specific atom at a specific time. If in the original timeline there was no future-you that suddenly showed up at your grandfather's time, the moment you travelled back in time, there is already a paradox.

@jaypee9575 Год назад

Exactly. People who talk about time travel like this seem to think causality is limited to major events. The moment you go back in time to before your birth, you prevent your birth. No specific actions are needed. A thought I've had when exploring this concept is that if you were to travel back in time 120 years (before the oldest person on Earth was ever born), then every single person on Earth in the present would be a completely different human being when you traveled back to the future.

@jackyleecs 2 года назад

If you choose not to kill your grandfather when you travel back in time, will the paradox still exist? Does it imply as long as you do not choose to kill your grandfather, backward time travel is possible?

@astrofistus9516 Год назад

If you don’t kill your grandfather, someone else will use the time machine to kill him. What if it’s an endless loop of generations of people dying, trying to steal/take credit for the invention of time machines. Lol

@behcherry9815 Год назад

The grandfather is an analogy. If your purpose for time traveling to the past was to kill hitljer, then once he is dead YOU in the present won’t need to time travel. So then hither won’t have been killed because you didn’t go back in time It’s a paradox and just a therory

@StephenWong14 Год назад

@Awesomizer83 Год назад

It applies for basically all of time travel. If you time travel to fix something, then you changed the past. Now that the past has been changed, in the future, you have no reason to go back in time and fix that thing. Since you have no reason to go to the past and fix that something, then you wouldn’t have time traveled. If you never time traveled, then that thing was never fixed.

@pargolf3158 11 месяцев назад

@3.36. A spinning coin is not "both heads and tails simultaneously". It alternates between heads and tails as it spins. When the spinning stops whatever picture is facing up.... well you get my point.

@shawnio 9 месяцев назад

the tiny gasps are hilarious

@shawnio 9 месяцев назад

I did not think of the time machine disappearing, good video

@davewilliam5228 2 месяца назад

How To Travel Back In Time 1. Build circulating light beams machine. 2. Use circulating light beams machine to travel back in time to travel to year 1985 AD.

@juniormexi1259 2 года назад

What about saving somebody death back in the past and come back 1 year later future or couple of days is that possible?

@toddwebb7521 8 месяцев назад

Futurama has this covered, you have to smash your grandma to be your own grandpa, sweet home Alabama

@loganboi2166 3 месяца назад

Ok: Here's my take on time travel. Now, there are different types of "causal glue" which is basically the tendency to cause grandfather paradoxes (they dont actually exist and are unprovable - they are more of a concept) High: Predestination paradoxes are common. Past is unchangeable. Medium: Major changes actually split the timeline, but simple existence does not. Low: Grandfather paradoxes are common. Past cannot be unchanged. (you can see people talking about this one in the comment section) I'll get to the paradox in the video. Let's generalize it. A (grandfather) > B (Clara) > C (time machine) C > /A (prevents grandfather) > /B > /C I propose: /C > A. This means: Grandfather births Clara makes time machine. Time machine causes grandfather's death - and Clara's existence and the time machine's existence. Non-Clara does not go back and time and does not kill her grandfather. (and then grandfather is alive) In this case, there is one universe where the grandfather is alive and killed. Timelines, you could say. These are mutually dependent and rely on eachother. The time travel kills the grandfather and the Non-time travel doesn't kill the grandfather. A little weird to think - but this actually solves most temporal paradoxes with enough timelines.

@eiko1 2 года назад

What if you transform into the age you were when you time travel? If that's so, then you wouldn't be able to invent it, since you invented it, and it didn't exist at that time

@davewilliam5228 2 месяца назад

How To Travel Back In Time 1. Use digital clock to make digital clock five hours backwards.

@art_njeri6619 6 месяцев назад

this is also explored in Olivie Blake's Atlas Six trilogy sooo well😭

@ericvulgate 3 года назад

except her own personal timeline still exists. she can kill him in whatever past she likes- but she still has a past that continues to exist. no paradox.

@billhuff6972 3 года назад

So then every time any person, or even a single particle travels to the past it creates a new timeline. That's not exactly traveling to the past; it's traveling to an entirely new universe which was identical to our universe up until the point that the the time-traveller went back to.

@blspot 2 года назад

@@billhuff6972 that's is where this issue comes in right, altering past would always change the construct of history , but your reality cannot make it possible since our understanding of time to be linearly moving so all the changes that you will make should either be accounted for or the changes that you are making does not happen in your reality

@jaypee9575 Год назад

If you had a time machine and went back 120 years in the past (before any currently living human being was born) and stepped on a blade of grass, when you returned to the present every single human being alive today would be a completely different person.

@7ae761 Год назад

would it

@bernardobmayne4833 Год назад

I don't think so, it doesn't have any coincidental interaction with history, grass literally will be grass.

@Randomprecious_hehe2 5 месяцев назад

@@bernardobmayne4833maybe that specific spot of grass was eaten by a deer, who ended up having to scooch a little to the left to get grass that wasn’t stepped on, he’s not in the cover of the bushes anymore and a wolf spots and eats him. Meanwhile you come from a timeline where you didn’t step on that spot of grass and the deer had eaten under the protection of bushes and the wolf did not spot the deer and he got to live for another couple of months. A branch in time is created in where 120 years ago, that said deer is dead and was supposed to feed a family, but it wasn’t at the right time or place because it was eaten by the wolf instead, the family starves and people who would’ve lived off of the nourishment of the deer end up passing away, where as in YOUR timeline they lived and were historical figures. It causes major effects and is just about unpredictable as it gets

@MackeyDeez 2 года назад

I knew that the Terminator franchise got it wrong. I mean Skynet can send as many Terminators into the past to kill Sara Conner but, it still won't change it's imminent defeat by the human resistance.

@Kirito_wr 2 года назад

I think there are a lot of misconseptions regarding time travels. First even if you time travel there is still the conservation of energy so if you travel in the past u still need to use energy that existed in the past to create your new body. Also a lot depends on the method u use to timetravel. For example you could just use a method like putting all atoms and energies and dark matter and everything we dont even know exists and put all in the same place and state from the same place and state in the past basically the same as if u would just rebuild a lego castle then that would be a way that would 100% work but you would need then to take some energy somewhere in the universe to create your body from the present. This would cause a reverse in actions but wouldnt make them undone. In this case the universe of the present would get replaced by a version of its past if you would change anything this would cause an infinite loop. This also solves the paradox involving u traveling back in time to give u the plans for a time machine because besides the logical problem of why should you send the plans from a timemachine to ur past self its either a loop that started when u gained the knowledge of creating a timemachine and then u send it in the past before you would come up with it by ur own. For the paradox that includes you as being your own father as a result of timetraveling the problem lies in the paradox it self, something like this simply wont happen its just impossible for this paradox to be created or exist.

@OldSkullSoldier 10 месяцев назад

What about E=mc^2? If you travel to the past, then you remove your mass from now, from which released energy would destroy life on Earth, and create maxx in the past - which means you would need to steal that energy or mass in the past from somewhere. So maybe only possibility would be to move information (which we know doesn't have mass) - in such case doing anything would require sustaining a link => we could assume that such link would break on any try to do something that would prevent that link of establishing.

@tallapragadamadhaviramalak4540 Год назад

I now wanna see Tenet once again after watching ur video 😂

@butterfly7530 Год назад

On my way to watch Tenet. ^^

@RizalBatheki Год назад

what if we use Butterfly Effect & Back to The Future style: before going back to 1960s, Clara buys a knife from a store called Super Jumbo Knife (introduced in 2019 by a company ran by young entrepeneurs in present day), puts it in her bag as she plans to kill her granddad by stabbing. She's also wearing Castore clothes (founded in 2015 by brothers born in late 80s and 90s). When she arrives in 1960, she got her granddad in sight. Just before she executes him, she reaches out her bag and suddenly her knife is gone, right? Cos the founder of Super Jumbo hasn't been born, thus her knife never exists. She must also be without any clothes after all...

@M.C.Escher2018 2 месяца назад

@ileilanambingaamtheleader1154 Год назад

Thesis As Grandfather Paradox. Antithesis As Grandmother Paradox. Synthesis As Grandparent Paradox. Hegelian Dialectic.

@catcubers3435 2 года назад

Me: Invents a time machine Some idiot: gets in the time machine then accidentally killed his grandpa by landing the time travel machine on his grandpa =That idiot has left the game due to grandpa paradox= K A R M A

@abdiali8016 3 года назад

Lmao u gotta have major problems in the head if you somehow found a way to time travel and instead of exploring , you target your grandfather to try and kill him ...haha

@ltdogoop 2 года назад

mad science, u gotta do something for answers am i rite

@dailydoseofmedicinee 3 года назад

👏👏

@joshuapere997 3 года назад

The video was posted 20minutes ago but your comment is an hour ago?!?!??!

@Scienceabc 3 года назад

Time travel at its best

@stathistsak3768 3 года назад

With this logic if you go back in time then even you wouldn’t exist; you are practically unborn

@deadsilence7319 2 года назад

Yes u no longer belong to a timeline

@jackyvivid 3 года назад

You mean reverse chronology, like Feynman and Wheeler's notion that a positron's an electron moving backwards in Time?

@Scienceabc 3 года назад

I smell Tenet

@CompletlyFree 2 года назад

Just as it's impossible to kill our grandfather (because we can't change the past that already transpired) by the same logic, we won't be able to go to the past (or the future for that matter) because just the "traveling" to the past or future means the present is being altered and that's impossible! In other words, time travel is proved to be impossible according to the grandfather paradox.

@jaypee9575 Год назад

Yes, simply by time travelling to a point before your birth will prevent your birth.

@autisticpi 3 года назад

I thought of this in another way: if you had a problem a minute ago, then you time travel to the past, and fix it, then that version of you won't have to fix it, but then the problem would remain, so you'd have to time travel to the past again, so everything would repeat eternally.

@JohnSmith-gd2ws 2 года назад

When you decide to not go back in time for some reason after like the 9000trillionth time because of the butterfly effect then it would just cancel it self out and you would not know that you traveled time infinite times and you would just go on with your day

@N3_r 2 года назад

There would be a superposition whereby in one universe you solved but opposite in the other

@MaxMuyu 3 года назад

What if I kill him after my father has already been born..... there is still going to be a me. Right ?

@saurabhsaxena22 3 года назад

Yes!

@MaxMuyu 3 года назад

@@saurabhsaxena22 problem solved !

@jeanaleonela2969 3 года назад

@@MaxMuyu But what if your grandfather played a role in getting your father and mother together?

@sagar8822 3 года назад

But for that why u need time machine😂😂😂u are already born

@jeanaleonela2969 3 года назад

@@sagar8822 What?

@NiranjanSuresh-br2qk 4 месяца назад

Plot twist: you were adopted

@moumenaburyah3523 2 года назад

lol i love the tenet scene

@nedspartan9248 2 года назад

How do we know time is even real? And not just a mathematical construct we came up with to be able to express "when" to each other?

@thatoneguy611 Год назад

It’s pretty clear time exists, otherwise nothing would exist, because the time for them *to* exist would never have passed.

@ShaggyJ1000 Год назад

I need to rewatch Loki again…

@jake_mk_0314 2 года назад

so it creates a parallel universe?

@anon5258 2 года назад

I killed my grandfather, don't know what's a time machine though

@Unknown-sg4tv 2 года назад

Travelling Back in Time Explained Because there's only one earth moving around the sun, means only the now is real. Time machine travelling back in time Cause's time to move backwards, causing earth to move backwards.

@Manuqtix.Manuqtix 2 года назад

Stuff like The grandfather paradox is jumping the gun The first problem is that when you travel back in time what is to happen to your present time period does it continue existing?

@ChrisSmith-gt6lg Год назад

I think you have proven that we are all alive and dead at the same time in multiple timelines.

@chrisidema Год назад

Even if you don't kill your grandfather you wouldn't be born. Different sperm will reach a different egg from potentially a different woman and even if it was the exact same sperm and egg it will randomly combine with the egg to form different DNA. Any microsecond delay in fertilization will effect the DNA. Even if, by some miracle, your father's DNA is the same, you have affected the timeline, which will result his child's DNA and upbringing be very different, so basically your (half)sibling might be born and might even have the same name as you, but it won't be you. Unless we are talking about a form of time traveling where you create a separate timeline. There are different forms of time traveling in science fiction. Going back in time simply means creating an alternate timeline where you will not be born. But your old timeline might still be there, or you will be orphaned.

@adityamozumdar383 2 года назад

What about grandmothers?

@secularhuman8544 3 года назад

what about new scenarios created on the spot ...like if someone goes in past and kill hitler then hitler should replaced by another cruel dictator and it goes on....is this possible if we kill own grandfather in past then i exist but with different name and memory

@deadsilence7319 2 года назад

U wouldnt b u with different memories tho

@thatoneguy611 Год назад

You just wouldn’t exist. The genes that made *you* were never carried on.

@Oneaboveall444 9 месяцев назад

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

@JAMES-my8bf 3 года назад

Sometimes, I like to Fill UP my Bathtub with Milk, lay in the Fetal Position and pretend that I'm a Cheerio...

@ricardobimblesticks1489 3 года назад

Why has the milk turned chocolatey? What did you do James, what did you dooo? :D

@xSOSAx-TM 3 года назад

@@ricardobimblesticks1489 😭😭

@kurtgundy 3 года назад

@@ricardobimblesticks1489 You like chocolate milk. You want to try it, don't you?

@Braneloc 2 года назад

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

@Zotrax1946 2 года назад

Exactly. If the past can not be changed- so the fact that you exist and invented a time machine also can’t be changed. So you still exist in the past, because all of the circumstances that already happened, and you kill your grandfather. That is it, nothing happens, the universe doesn’t “stop” you from doing anything because as mentioned- you can’t change what already happened. The person that you just killed isn’t your grandfather- YET! In this current point in time. He is just a person with no relation to you. If you’re honest, you can’t apply a law on one side of the equation and ignore it for the other side of the same equation… Another point is that time is relative. For the person traveling back in time, when he’s in the past, it is the present for him- not the past, he is there “now”. And that “now” consist of being born, growing up and inventing a time machine and go back in time and kill a person in that point of time, that specific present. Nothing can stop this sequence of events. By the way You will be able to return to the future (to the time and place you left), and you will be there, existing as you, with no other you because the other you was not born, you killed HIS grandfather.

@Jimmyjimjimjim Год назад

Why do you assume the time traveler invented the time machine?

@dreamwork69 Год назад

The theory that multiverse exists make more sense than just one. So if u travel back in time and kill ur grandpa, u have entered or create a new verse.

@Origami84 2 года назад

Honestly, i don't think time is something you can travel within. The fact that it can move faster or slower (as it happens near black holes) doesn't mean that you can move yourself, or anything really, through time. Time is probably more of a concept than a dimension. That said, if it was possible, i don't think this paradox still has any merit. You go "back into time", as in you move yourself to a time/situation/moment definible as "before" with all that it entails, and you kill your grandpa. Cool. Therefore, provided there are no more modifications, your parents wont be born and technically you will not be born in that future. But you, the traveller, already exist. That you stay in that period or move back to your starting point, "time" will move on accordingly to what is the situations it is in. As in, yes, no grandpa and no dad. But you still exists, i still see no paradox. If you go back to te "future", you will arrive in a future developed from the past you modified. There is no alternate version of you, but YOU, the one that travelled, is still there, a physical existance. It doesnt even seem that complicated to me.

@sadmanhasin6997 Год назад

I have a thought about it.. that the whole paradox is wrong. I'm just a highschool student, with little to no physics background. What I understand is that everything move through time in one forward direction. And moving in opposite direction is considered as going in the past. So let's assume that we could go in the opposite direction, but everything else is moving in forward direction. So Even if we go in past, we'll be in a space with no other matters around us. Almost like empty space, except that I think there will be physics-fields like electromagnetic field.

@mikzuzumaki4961 2 года назад

And what the hell why would u kill ir grandpa for what reason???

@ricardobimblesticks1489 3 года назад

The paradox assumes that the energy arranged as the matter that was your grandfather can only exist in that state once. If that is not the case, killing your grandfather wouldn't cause you to blink out of existence but merely change your date of birth :D

@hypersonicrush 2 года назад

4:21 *The TVA would like to know your location*

@LordHilpolithRothschild 2 года назад

Your theory is against astrophysics brother because you're actually saying that my grandfather in the past exists in an alternate timeline

@mangiblotarinawabag4964 2 года назад

It's hard to grasp the reality of the universe when you can only think in 4 dimensions.

@mira-it2hu 2 года назад

but like how many years until we actually figure out how to make a time machine lol, like it's gonna take a LOTTA work. you cant go back before you were born bc well, u don't exist lmao no this is weird, but his dad was already born maybe? because if he's killing his GRANDPA, that means his dad already exists 🤷 and besides, it's a theory right? which means it never happened, so yes, maybe it doesn't make sense because we just made it up? oh but what if he's going back in a copy of his history it's literally how a time machine works and he's affecting a parallel universe. sooo, he does kinda fade away, right after he kills him THIS HURTS MY BRAIN oml if he killed his grandfather there's no grandfather hence no paradox, right? IM SO CONFUSED

@dennismccarty7728 7 месяцев назад

the arrow of time only heads into the future from the past there is no present the arrow is always moving think about it.

@blahanger4304 Год назад

A flipped coin is only both to the observer...untill it lands..."drops mic"

@kuiper3050 Год назад

answer : [ many world theory ] / [ multiverse theory ]

@bernardtruchet Год назад

La phrase d'introduction à la vidéo précise qu'un voyageur temporel se rend dans "son" passé, il faudrait donc que les scientifiques prouvent qu'il n'y a pas 1 seul passé mais un passé propre à chaque être humain, d'autre part, "si c'était vrai", le raisonnement serait également valable pour le futur : un homme en se déplaçant dans le futur pourrait modifier le présent.!!!

@gennadiyradchenko1419 2 года назад

🤣🤣🤣 i read "GODfather paradox", I remembered the well-known film and thought "what kind of paradox with the godfather?"

@fasgamboa 2 года назад

You would ne be able to even speak to him, as he had not spoke to you before...

@Simplifiree 10 месяцев назад

What if your father was already born when you killed your grandfather?

@azeemtwelhath4168 2 года назад

You can't travel back to the past to fix anything....If you could,then the problem doesn't even exists in the present...which means that you will not travel back in time......Also you the present man cannot encounter your past self because...only if you have met your future self in your present..,you can meet your past self...which makes you the future self for the past self

@pasyaltayo23 2 года назад

What if Clara killed his grandfather after the birth of her father?

@abrahamsalamah5773 2 года назад

Her father is going to grow up without a dad. That leads him to have a different childhood in which he might not like Clara's mom in the future. If he marries another woman, the Clara in this video will never be born and therefore cease to exist. Another "clara" (maybe with another name) will be born instead.

@TonyStark-di5fj 3 года назад

👋

@joshuapere997 3 года назад

Whats up hows heaven?

@joshuapere997 3 года назад

So the Grandfathers paradox is kinda like a schrodingers cat theory.

@billhuff6972 3 года назад

I don't think so. Grandfather paradox is obvious and simple to explain and understand. Quantum mechanics are not obvious because physics at very small dimensions is very different from physics at human dimensions.

@gabrielmello5477 8 месяцев назад

And why would you wanna kill your grandfather in the first place?! Wtf

@mehekuppal Год назад

why would you kill your grandfather

@justinjeffrey8193 11 месяцев назад

What if you went to the past, and your grandfather killed you?

@frederickw5532 Год назад

I don't think that the problem would arise if particle transportation hasn't been solved. Yes you would see gramps but only as a hologram, this is only my theory.

@frederickw5532 Год назад

I also think this theory applies to ghost's, they are like holograms, you can see but not touch

@kaljuhyypio 2 года назад

So if you travel in the future, you can't come back?

@begula...3896 Год назад

This would be the worst way to find you were adopted😂

@The1stDukeDroklar 7 месяцев назад

Not a paradox. Anything you would do when you go back in time was already part of your past before going back in time. So that means that for whatever reason, you were not successful in your objective.

@zeithz Год назад

my brain is not brainning

@vaultry2051 2 года назад

So multiple dimensions solves the paradox?

@thatoneguy611 Год назад

If you want to be boring, yes.

@vaultry2051 Год назад

@@thatoneguy611 Okay, so then what's your solution?

@thatoneguy611 Год назад

@@vaultry2051 multiple dimensions. I wasn’t trying to say there was another solution, it just seems too easy to say it was another dimension.

@vaultry2051 Год назад

@@thatoneguy611 Haha! Okay dude.

@M.C.Escher2018 2 месяца назад

Did anyone in history found or declare this to be true? At what time and when did anyone say there is a grandfather paradox? Okay - who was that and when? In order for that to become fact - there must be facts. SO where are the facts?