The Quantum Theory that Connects the Entire Universe

  • Ajoutée 20 mars 2019
  • SciShow is supported by Go to to get 20% off of an annual Premium subscription.
    Quantum mechanics is weird and seems a bit...complicated. But understanding it can help us to understand the universe.
    Hosted by: Hank Green
    SciShow has a spinoff podcast! It's called SciShow Tangents. Check it out at
    Support SciShow by becoming a patron on Patreon:
    Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever:
    Bill & Katie Scholl, Adam Brainard, Greg, Alex Hackman, Andrew Finley Brenan, Sam Lutfi, D.A. Noe, الخليفي سلطان, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, Charles Southerland, Patrick D. Ashmore, charles george, Kevin Bealer, Chris Peters
    Looking for SciShow elsewhere on the internet?

    Image Sources:

Commentaires • 1 286

  • SciShow
    SciShow  Il y a 3 mois +73

    SciShow is supported by Go to to get 20% off of an annual Premium subscription.

    • Josh Lasky
      Josh Lasky Il y a 3 mois

      Scishow...paid for by Deepak Chopra lol

    • Dadson worldwide
      Dadson worldwide Il y a 3 mois

      The fact we the observer are at the center of the universes is the samething mans known forever .

  • Aidan Kedzierski
    Aidan Kedzierski Il y a 23 heures

    The only thing faster than light is monarchy.

  • Atermagister
    Atermagister Il y a jour

    Schrodinscher? :,D SchrÖÖÖÖdinger c,:
    Just sounds funny ^^"

  • Chyn fu
    Chyn fu Il y a 3 jours

    the reason electron are effecting each other faster speed of light is because they are part of a network strings.

  • Jcknight7996
    Jcknight7996 Il y a 7 jours

    Can you do an episode about QFT?

  • Howard Delovitch
    Howard Delovitch Il y a 9 jours

    wHAT IS AN "Ex-Spearmint" ? and if you put a cat , in a box , and don't feed's gonna DIE!

  • 50 subscribers without any videos without videos

    Well, im just dead. Never been alive

  • Fantomp
    Fantomp Il y a 13 jours

    What if the cat has an immunity to the poison

  • Lee Guthrie Quantum Spring
    Lee Guthrie Quantum Spring Il y a 13 jours

    Very well done

  • 1959Edsel
    1959Edsel Il y a 13 jours

    Wanted dead and alive: Schrodinger's Cat

  • Joseph Hutton
    Joseph Hutton Il y a 15 jours

    How about a quantum theory compilation?!

  • Ali Kafafy
    Ali Kafafy Il y a 22 jours

    Wow that cat is wanted dead or alive

  • M Man
    M Man Il y a 22 jours

    The Schrodinger problem always had this one thing that put a wrench in the whole program the fact that the cat was living before you put it in the box it is able to make its own observations unless you poked both of its eyes out put a blindfold sounds like it would be a lot less harmful to the 🐈

  • Tippi B
    Tippi B Il y a 25 jours

    I had the frustrating experience of understanding quantum mechanics for about 12 seconds and then it slipped away from me. I, a lowly writer of TV show reviews, was at the dog park talking to NASA scientists (I lived down the road from the Johnson Space Center) and I made a quantum mechanics joke. Except... I no longer remember the joke. It evaporated out of my mind as soon as I finished. But I do recall that the NASA people laughed heartily and said it made sense.

  • Devon Carter
    Devon Carter Il y a 26 jours

    Just saying that if the pilot wave theory is true that would mean travel faster than the speed of light

  • Zoë de Wijn
    Zoë de Wijn Il y a 28 jours

    but wouldnt the cat be able to observe weather or not the superposition happened and the poison got released, and therefore it would be only one of those things and not both?

  • iMeMyself
    iMeMyself Il y a 29 jours

    System call: generate quantum element. Form photon. Discharge.

  • Genave NNMN!
    Genave NNMN! Il y a mois

    Sheldon bring me here.

  • Vinish
    Vinish Il y a mois

    Is that string theory?

  • Mavrick 1975
    Mavrick 1975 Il y a mois

    With scientist finding more and more things on the subatomic level I was wondering about beyond what we know now. If we can calculate the weight of a shadow and their is technically nothing their if you truly tried to create a vacuum and remove all known particals down to the quarks is it truly empty or is nothing made up of something?

  • altareggo
    altareggo Il y a mois

    Trump supporters are perpetually interposed in the narrow space between conspiracy theories and "alternate facts".

  • Raven White
    Raven White Il y a mois

    The distance between the sun and the black hole of our universe is spaced the same distance equal to the golden ratio, allowing gravitational balance.
    The sun is powered by the destruction of the black hole. That is why the sun will not change without the input of the black hole equally changing.
    Makes sense, no?

  • ykOni
    ykOni Il y a mois

    What is this world?

  • Maldus Alver
    Maldus Alver Il y a mois

    time to play a game of quantum tic-tac-toe

  • Kaveevin
    Kaveevin Il y a mois

    The more quantum mechanics videos I watch, the more evidence I get that we're all living in a simulation.

  • johnathan blevins
    johnathan blevins Il y a mois

    U guys should start sci show for dummies

  • Fitness and Firearms
    Fitness and Firearms Il y a mois

    My girlfriend was right. I am TOO high for this. Great video! Im subbing

  • Jason Hacker
    Jason Hacker Il y a mois

    Zombie cat video?

  • rogerdotlee
    rogerdotlee Il y a mois

    Now wait a minute. About superposition, the premise of the experiment is that you generate two electrons that MUST be spinning in the opposite direction. You then move them a couple giga-furlongs away from each other. You observe them and find they're spinning in opposite directions. Unless I'm missing something fundamental, the only reaction to this should be 'well duh! This tells me our electron-spin-generator is functioning as expected.'

    What am I missing?

  • Neo2266
    Neo2266 Il y a mois +1

    It’s Schrodinger, as in “Dingus”

  • Forever Evolving
    Forever Evolving Il y a 2 mois

    Superposition is possible because of the multiverse.

  • Anup Gamer
    Anup Gamer Il y a 2 mois

    You should have sub tital

  • Paul Gardner
    Paul Gardner Il y a 2 mois

    One of the best videos you've made!

  • Dred Cthulhu
    Dred Cthulhu Il y a 2 mois

    Something I’ve always had an issue with, wouldn’t the cat be able to observe itself? Ergo it’s one or the other, not both. I’m not a physicist so I have no idea. But logically the cat would be the observer right?

  • johan erik theodor clemmesen

    I live in Copenhagen Denmark. It's a super position to be in.

  • Joey Lochart
    Joey Lochart Il y a 2 mois

    pilot wave is only theoretical.. across the emptiness of space, the pilot wave is dead.. its like a discontinuous layer between masses.

  • Joey Lochart
    Joey Lochart Il y a 2 mois

    electrons resonate when seperated because they were connected, so their wave lengths did interact closely at some point. this would have some cause and effect on their spins that might cause them to resonate, even when further apart and seperated. that's my speculation.

  • Holl E. H.
    Holl E. H. Il y a 2 mois

    So when I wish on a star, it gets there at 2 different rates? (Immediately and only at the speed of light?)

  • Dan Zuck
    Dan Zuck Il y a 2 mois

    Very clear; nice. Thanks.

  • Toad Roach
    Toad Roach Il y a 2 mois

    So if a tree falls over in the woods and there is no one around to see it, has it actually fallen over?

  • SFaPiL2
    SFaPiL2 Il y a 3 mois

    I dont know the underlying math in pilot wave theory but, by the way that it's being explained, it reminds me of modal analysis and other studies I've done in signal analysis during my engineering degree.
    Rather than thinking of the two particles being interlocked independently from space (indicating information travelling at extremely high velocities in order to guarantee their states are interlinked) couldn't it be that they normally match a "wave" which is independent from space itself? A "natural frequency", if you will accept my analogy with modal analysis, where these particles fit in the nodes of such waves; hence retaining a similar behavior as long as they stay fixed to the nodes of this wave independent from time and space.
    In order for this to be valid, though, an infinite number of particles all fitting in separate nodes of this hypothetical "wave" would all retain the same properties of the particle under test.
    Does anyone more knowledgeable know whether this analogy I brought up is a load of garbage or not? ;P

  • Existenceisillusion
    Existenceisillusion Il y a 3 mois

    2 things.
    1) QM properties of individual particles contribute to the QM properties of larger ensembles, and above some threshold ensemble size, the QM properties "smear out" (else we would have to choose which contribute and which don't), resulting in the classical properties we know and love.
    2) I think it's Bell's theorem that showed that entanglement is more than just deduction. I.e., if we know there are a total of two states and two particles, and after separating them, we observe one, we subtract the observed state from the list of possibilities, leaving only one state possible, thus not requiring FTL info. Bell's theorem showed this is not true...if I remember right.

  • Patrick Mcguire
    Patrick Mcguire Il y a 3 mois

    Our simulation overlords dictate the rules that guide their universe..we are just along for the ride 😂

  • kiss my dirty ass
    kiss my dirty ass Il y a 3 mois

    Send me computer free😂😂😂honestly

  • MJ Music
    MJ Music Il y a 3 mois

    I’ve said it before and I’ll say it again. It

  • blubastud
    blubastud Il y a 3 mois

    Why does this sound like quantum entanglement?

  • Hyacinthus
    Hyacinthus Il y a 3 mois

    Copenhagen throws out both determinism and locality, Pilot Wave throws out locality. In no way does the Copenhagen interpretation make more sense than Pilot Wave theory.

  • Theⱥωesoͥϻeͣgͫ
    Theⱥωesoͥϻeͣgͫ Il y a 3 mois

    So... Ockham’s razor?

  • Shaboopy
    Shaboopy Il y a 3 mois

    The copenhagen interpretation just seems like a place-holder until the fuller picture can be hashed out.

  • John Walker
    John Walker Il y a 3 mois

    Your gender is in Superposition.

  • Owen Eastwood
    Owen Eastwood Il y a 3 mois

    But what defines an observer/observation? It can’t be that something requires a living thing to observe it in order to change, so what’s actually happening here?

  • Jons LG
    Jons LG Il y a 3 mois +1

    The shroedingers cat experiment is a horrible example imo, unless you're trying to prove that the particle is indeed in one state or another..
    Because you don't actually change the cats state by measuring it. The cat is indeed either alive or dead, and the only thing that changes is your knowledge, as the measurement has no effect on the cat.

  • zainab alshammari
    zainab alshammari Il y a 3 mois

    Very good job on explaining such a weird yet correct theory .. it's the brain food I'm looking for!

  • EmptySora_
    EmptySora_ Il y a 3 mois

    I love all the videos on SciShow but the quantum mechanics ones are always among my favorites.

  • Daniel 777
    Daniel 777 Il y a 3 mois

    My question is has anyone studied Seashells, with Quantum. I remember listening to the echoes of the Ocean younger.

  • Eric McGuinness
    Eric McGuinness Il y a 3 mois

    Super position.....but when ever in the universe is something not being observed by or interacting with all the other particles, energies and forces around it? When is something ever completely isolated? Doesn't make sense to me but what do I know.

  • Seán O'Nilbud
    Seán O'Nilbud Il y a 3 mois


  • Igi Vup
    Igi Vup Il y a 3 mois

    Sperm cells are particles and waves at the same time... Just sayin.

  • jeffwads
    jeffwads Il y a 3 mois

    Nothing is random. If you have all the variables, you will be able to calculate the event completely. The cat experiment is ridiculous. The cat would be either alive or dead. The observation aspect is moot because you are outside the box.

  • Zes
    Zes Il y a 3 mois

    no such thing as connecx or not

  • Matlab Tutor
    Matlab Tutor Il y a 3 mois +1

    i am still not getting it --- The dead and alive Cat *** I mean we can use the argument in many classical experiments like The example of Dice ???? i dont know why the Cat's example is a big deal for quantum mechanical particles????

  • xxDrain
    xxDrain Il y a 3 mois

    By now all those cats have knocked the vial over themselves and they're all dead.

  • Ken O
    Ken O Il y a 3 mois

    "Reality, what a concept! "-Mork from Ork (Robin Williams). But when it comes to quantum mechanics, the question is, Which reality?

  • Krazy Maniak
    Krazy Maniak Il y a 3 mois

    What if you put the cat into a glass box

  • merlopick
    merlopick Il y a 3 mois

    Schrodinjer?? @3:48 "every expiriment"??? How the hell does this guy talk???

  • Russell Alson
    Russell Alson Il y a 3 mois

    Could anyone explain why most scientists decided Copenhagen? Its seems to me both have just as crazy cons (cat dead and alive analogy or all particles effect each other in the universe)

  • H Missy
    H Missy Il y a 3 mois +1

    What if nothing is ever fixed, and your perception is the only thing that makes it SEEM like it's fixed?

    TROUBLE CAINE Il y a 3 mois

    YOU WERE very wise to SHOW your words in the graphics to aid understanding. This channel is always getting better...!!

  • Gristle Von Raben
    Gristle Von Raben Il y a 3 mois

    Actually the rudimentary roots of laser light research comes from crystallography, sapphires and rubies create a strange star effect simetimes. We typically use rubies to make lasers by pumping light into a reflective cylinder and aligning the crystal so that it bounces light to the front and back of the cylinder until it comes out of that tiny area of the ruby that only allows a thin plane of light to exit. Quantum theory helped explain it, not to create it, correct?

  • tonz lang
    tonz lang Il y a 3 mois

    "theory" why do scientists do not get that?