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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:

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:

Technical paper that discusses the same thing:

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Music by Nathaniel Schroeder,

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27 COMMENTS

  1. Capes & Reels Posted on July 26, 2020 at 9:33 am

    If DARK brought you here

    To understand dark you need to come out of the time lines and focus on something else https://youtu.be/llVyzzUV1sc

    Reply
  2. arthi Kumar Posted on July 26, 2020 at 9:33 am

    I found a error in grandfather paradox…. seriously want to review… anyone help me… Minute physics

    Reply
  3. AARON DJ Posted on July 26, 2020 at 9:33 am

    In the first place, Why would you kill your grandfather??

    Reply
  4. Sarina Szczepanek Posted on July 26, 2020 at 9:33 am

    My grandfather is Schroedinger's cat.

    Reply
  5. 1M Subscribers with NO posts Posted on July 26, 2020 at 9:33 am

    Imagine you go past Have Sex with a woman and Your Father's born
    So you are your own GrandFather

    Reply
  6. Supernatural_Avocado64 Posted on July 26, 2020 at 9:33 am

    Okay, but why aren’t we questioning the fact that we’re murdering a child?

    Reply
  7. Supriya and vishal Posted on July 26, 2020 at 9:33 am

    I think that as soon as he kill the grandpa,the boy and other which shouldn't exist should disappear,the memory, life ,and everything…nature wants to follow the rule

    Reply
  8. Shutter Butt Posted on July 26, 2020 at 9:33 am

    The next sentence is a lie.

    The previous sentence is the truth.

    😋 i did the grandfather paradox

    Reply
  9. Asashi Posted on July 26, 2020 at 9:33 am

    Can someone explain it to me

    Reply
  10. under the stranger Posted on July 26, 2020 at 9:33 am

    please Japanese!

    Reply
  11. 100k subs with one video Posted on July 26, 2020 at 9:33 am

    Me at 3am:I dont need sleep,I need answers

    Reply
  12. Thäpän Røshïn Posted on July 26, 2020 at 9:33 am

    Every action has an equal and opposite reaction
    So if you kill your grandfather
    U kill your self

    So don't kill anyone!!!!!

    Reply
  13. Aaron Wright Posted on July 26, 2020 at 9:33 am

    So we're gonna ignore the fact that he said you killed your grandfather so both your mother and father wasn't born😂. Sweet sweet America

    Reply
  14. Siptom Posted on July 26, 2020 at 9:33 am

    When you apply maths that half of the viewers understand

    Reply
  15. Quar Posted on July 26, 2020 at 9:33 am

    I don't think multiple timelines really exist. While it's fun to think about it just doesn't click with me. Personally, I think Time Travelling to the Past or Future is like activating Spectator Mode. You can't do anything to anyone because you cannot be seen, smelled, heard or touched. You can, however, hear and see and maybe even smell but you can't physically interact. Oh and I also believe when you do time travel the present stops moving altogether.

    Reply
  16. 1RuG6 Durbek Ataboev Posted on July 26, 2020 at 9:33 am

    My mind exploded🤯🤯🤯🤯

    Reply
  17. Dino Satay Posted on July 26, 2020 at 9:33 am

    I think that you existing in the present and you went back in time to kill your grandfather means that your present self's grand father actually did seemingly die because of you in the past but your grand father either 1)Didnt actually die 2)got revived/cloned 3)had his umm… "Stuff" stored by your grandmother for your grandmother to umm… "Fertilize" herself

    Reply
  18. Sudhakantha Girmohanta Posted on July 26, 2020 at 9:33 am

    But the length scale we are talking about should not involve quantum mechanics!!

    Reply
  19. Upanshu Lakhani Posted on July 26, 2020 at 9:33 am

    In short what the video meant was (a very simple explanation for all of you)

    Well yes but actually no

    Reply
  20. Upanshu Lakhani Posted on July 26, 2020 at 9:33 am

    Schrödinger's Grandfather

    Reply
  21. the late late meme show with you Posted on July 26, 2020 at 9:33 am

    so here is the solution
    when you go back in time
    protect your grandfather
    and if you fail
    don't travel back to present
    and live a vintage life

    Reply
  22. Rohini Gupta Posted on July 26, 2020 at 9:33 am

    This just explained the entire “Dark” series to me!! Now it makes sense:)

    Reply
  23. Biprap Bastola Posted on July 26, 2020 at 9:33 am

    It would have been so easy if jonas had seen this video

    Reply
  24. Itsme_jupiter Posted on July 26, 2020 at 9:33 am

    me 4 years later: how i wish this thing still existed

    Reply
  25. Yanamandala Vishnu Datta Posted on July 26, 2020 at 9:33 am

    Is anyone here after watching Dark?

    Reply
  26. Ninad Suryawanshi Posted on July 26, 2020 at 9:33 am

    *You Confused Me Even More*

    Reply
  27. Niloy Barai Posted on July 26, 2020 at 9:33 am

    it's looks like i am seeing Dark:s3🤓

    Reply
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