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    The Strangest Implication of Quantum Mechanics

    Veritasium

    3 HN recommenders · recommended in 4 months, 2025

    YouTube

    33:01 · 21M views · Mar 5, 2025

    A Veritasium video that follows the principle of least action from Bernoulli and Newton to quantum mechanics, asking whether light takes all possible paths at once. It includes experiments showing quantum waves.

    HN commenters call it eye-opening and deeper than typical layman explanations, linking it in double-slit and mechanics threads.

    Physics, Space & ChemistryQuantum physicsFundamental physics
    1. 9:16
      Quantum Entanglement & Spooky Action at a DistanceVeritasium4.5M views • 11 years ago
    2. 7:40
      The Original Double Slit ExperimentVeritasium10M views • 13 years ago
    3. 14:48
      The Biggest Misconception About ElectricityVeritasium28M views • 4 years ago
    4. 1:46:33
      Lecture 1 | The Theoretical MinimumStanford970K views • 14 years ago
    5. 20:00
      Why Parallel Universes Are Probably RealVeritasium25M views • 6 years ago
    6. 4:19
      How Special Relativity Makes Magnets WorkVeritasium4M views • 13 years ago
    7. 19:05
      Why No One Has Measured The Speed Of LightVeritasium24M views • 6 years ago
    8. 7:41
      Is This What Quantum Mechanics Looks Like?Veritasium6.2M views • 10 years ago
    9. 45:13
      You've (Likely) Been Playing The Game Of Life WrongVeritasium12M views • 11 months ago
    10. 1:00:18
      Quantum Fields: The Real Building Blocks of the Universe - with David TongThe Royal Institution6.9M views • 9 years ago
    11. 27:40
      The Biggest Misconception in PhysicsVeritasium14M views • 1 year ago
    12. 27:15
      The Most Misunderstood Concept in PhysicsVeritasium31M views • 3 years ago
    13. 11:44
      World's Roundest Object!Veritasium38M views • 13 years ago
    14. 19:17
      How Wrong Is VERITASIUM? A Lamp and Power Line StoryElectroBOOM4.4M views • 4 years ago
    15. 17:34
      What Everyone Gets Wrong About GravityVeritasium16M views • 6 years ago
    16. 21:38
      Risking My Life To Settle A Physics DebateVeritasium12M views • 5 years ago
    17. 45:55
      Turning Waves Into ParticlesHuygens Optics194K views • 1 year ago
    18. 19:29
      The Surprising Secret of SynchronizationVeritasium28M views • 5 years ago
    19. 1:03:43
      The Quantum Conspiracy: What Popularizers of QM Don't Want You to KnowGoogle TechTalks1.8M views • 15 years ago
    20. 12:00
      Do we have to accept Quantum weirdness? De Broglie Bohm Pilot Wave Theory explainedLooking Glass Universe125K views • 9 years ago

    5 comments from Hacker News

    1. @DanielVZMar 2025· in “Did the Particle Go Through the Two Slits, or Did the Wave Function?”

      I really don’t understand the topic much but this veritasium video is quite eye opening and goes into further depth than any layman explanation I’ve ever seen in the topic: this video

      Strongly recommendsView on HN
    2. @beyondCriticsMar 2025· in “Did the Particle Go Through the Two Slits, or Did the Wave Function?”

      this video I had learned about the double slit experiment in school, but in my mind it was something of a theoretical construct. This veritasium video demonstrates, that quantum waves are very real and tangible. This is how physics should be.

      RecommendsView on HN
    3. @BalgairJun 2025· in “Infinite Grid of Resistors”

      Aside: Veritasium had a great video similar to this on the paths that light takes. I'll link to the part where they do the best physics demo I have ever seen : this video

      RecommendsView on HN
    4. @jimbosisAug 2025· in “Double-slit experiment holds up when stripped to its quantum essentials”

      There's another Veritasium video that has a neat experiment ostensibly showing light (both lamp and laser sources) "taking all paths" (or words to that effect--I don't really know what I'm seeing or what I'm talking about!) It starts around 25 minutes in. this video EDIT: Whoops. The YouTube video linked by naasking in this comment: [LINK] touches on the Veritasum video I linked to and goes to some length to explain that it is NOT proving the light is taking "all possible paths." He also brings up and links to a video on the "Looking Glass Universe" channel in which the hostess recreates the Vertiasium experiment and gives a differing interpretation. (Some commenters there have objections to the experimental setup. Oh boy, I may be down a rabbit hole here.)

      CitesView on HN
    5. @aeonikOct 2025· in “Structure and Interpretation of Classical Mechanics (2014)”

      You know about the Ultraviolet catastrophe? Physics Explained Ultraviolet Catastrophe: [LINK] This Veritassium Video goes back further in time and talks about Action, and the Genesis of this idea. this video Chemistorian, The history of Atomic Theory. [LINK]

      CitesView on HN