The Quantum Theory that Connects the Entire Universe

  • Published on Mar 20, 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?
    Facebook: scishow
    Twitter: scishow
    Instagram: thescishow

    Image Sources:

Comments • 1 308

  • SciShow
    SciShow  6 months ago +78

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

    • Josh Lasky
      Josh Lasky 5 months ago

      Scishow...paid for by Deepak Chopra lol

    • Dadson worldwide
      Dadson worldwide 5 months ago

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

  • Georgi Georgiev
    Georgi Georgiev 2 days ago

    Quantum is the new zero.

  • dylan foley
    dylan foley 4 days ago

    the cat thing isnt meant to be taken literally .... he didnt mean that cats are both alive and dead he meant that until we check it exists as only a potential of both ...

  • Dagne Zandovaite
    Dagne Zandovaite 13 days ago

    I love that then they were talking about physicists of the 20's, they used art deco backround

  • Jan Papai
    Jan Papai 14 days ago

    When someone makes 'shrodinger' from 'schrödinger' 😂

  • Aaron C Harvey
    Aaron C Harvey 19 days ago

    Legit question: why cant pilot wave theory have multiple waves that "choose" paths like a circuit board? No wave would be "off" but where circuit 'a' doesnt intersect another wave circuit is in place and there is something behind all this dictating the different flow, perhaps living things themselves affect this flow?

  • cosmos and physical laws

  • MrGlobbits
    MrGlobbits 22 days ago +1

    For a second, I understood this. Then a second later, I didn't.

  • Essero Eson
    Essero Eson 23 days ago +1

    Maybe quantum entanglement isn't two different particles, but the same particle seen from two different perspectives.
    Like a coin that exists in a higher dimension so that the 'head side' can be in one spot in our universe and the 'tail side' can be in another. When you turn the coin to see the other side, naturally, the other side is also flipped.

  • PyramidCeres
    PyramidCeres 23 days ago +1

    So I'm dead and alive at the same time.

  • Cheshire Kat
    Cheshire Kat 24 days ago

    It's a bird!
    It's a plane!
    It's Superposition!

  • mr_ byebye
    mr_ byebye 25 days ago

    Say gus name right

  • SiY11
    SiY11 Month ago


  • harry Couwenberg
    harry Couwenberg Month ago

    if you replace the poison whit water do jou have a thursty cat if you open the box?

  • harry Couwenberg
    harry Couwenberg Month ago

    Does Quantum decay also lineair slow down like a twin slows down eagin in a spaceship?

  • Ken G
    Ken G Month ago

    Why are you killing cats?

  • Levi Bazen
    Levi Bazen Month ago

    Pilot wave + one electron theory? 😂

  • Hope Rules
    Hope Rules Month ago

    hmmm...pilot wave sounds just like bacteria that touches water--everythibg the water thence contacts is essentially infected(!)

  • Josh Guyette
    Josh Guyette Month ago

    Oh I love me my (the) pilot wave theory :)

  • Dogs Sing
    Dogs Sing Month ago +1

    Quantum physics is all wrong. Joke physics.

  • frost355 S.
    frost355 S. 2 months ago

    I watch this 3 times already and still don't understand welp

  • Naveron
    Naveron 2 months ago

    Pilot wave theory sounds a lot like the hidden variable interpretation

  • ProbablyNothing
    ProbablyNothing 2 months ago

    The ability to determine an electron's spin when it is very far away is not a violation of locality. It is an example of the Reeh-Schlieder theorem, which among other things, states that in the vacuum sector of a quantum field theory, local measurements can always be used to exactly distinguish one state of the universe from another, even if that state includes information about the spin of an electron a million miles away.

    This is a direct consequence of locality, and is a perfectly reasonable thing to expect of a relativistic quantum theory. You haven't changed the state of the electron far away, just measured it.

  • Aidan Kedzierski
    Aidan Kedzierski 2 months ago

    The only thing faster than light is monarchy.

  • Atermagister
    Atermagister 2 months ago

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

  • Chyn fu
    Chyn fu 2 months ago

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

  • Jcknight7996
    Jcknight7996 2 months ago

    Can you do an episode about QFT?

  • Howard Delovitch
    Howard Delovitch 2 months ago

    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 2 months ago

    What if the cat has an immunity to the poison

  • Lee Guthrie Quantum Spring

    Very well done

  • 1959Edsel
    1959Edsel 2 months ago

    Wanted dead and alive: Schrodinger's Cat

  • Joseph Hutton
    Joseph Hutton 2 months ago

    How about a quantum theory compilation?!

  • Storm striker
    Storm striker 3 months ago

    Wow that cat is wanted dead or alive

  • M Man
    M Man 3 months ago

    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 3 months ago

    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 3 months ago

    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 3 months ago

    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 3 months ago

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

  • Swastika Venice
    Swastika Venice 3 months ago

    Sheldon bring me here.

  • Vinish
    Vinish 3 months ago

    Is that string theory?

  • Mavrick 1975
    Mavrick 1975 3 months ago

    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 3 months ago

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

  • Raven White
    Raven White 3 months ago

    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 3 months ago

    What is this world?

  • Maldus Alver
    Maldus Alver 3 months ago

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

  • Kaveevin
    Kaveevin 3 months ago

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

  • johnathan blevins
    johnathan blevins 4 months ago

    U guys should start sci show for dummies

  • Fitness and Firearms
    Fitness and Firearms 4 months ago

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

  • Jason Hacker
    Jason Hacker 4 months ago

    Zombie cat video?

  • rogerdotlee
    rogerdotlee 4 months ago

    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 4 months ago +1

    It’s Schrodinger, as in “Dingus”

  • Forever Evolving
    Forever Evolving 4 months ago

    Superposition is possible because of the multiverse.

  • Anup Gamer
    Anup Gamer 4 months ago

    You should have sub tital

  • Paul Gardner
    Paul Gardner 4 months ago

    One of the best videos you've made!

  • Dred Cthulhu
    Dred Cthulhu 4 months ago

    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 4 months ago

    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 4 months ago

    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. 4 months ago

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