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The Strangest Implication of Quantum Mechanics

Veritasium · explainer · Watch on YouTube

Quantum physicsFundamental physics

What it is

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.

Why Hacker News recommends it

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

  • 3 people recommended it
  • 2 different months
  • 1 strong recommendations
  • first 2025, last 2025

What HN commenters said

  1. “this veritasium video is quite eye opening”

    Eye-opening, deeper than typical layman explanations

    DanielVZ, 2025-03 · Strong recommendation · in “Did the Particle Go Through the Two Slits, or Did the Wave Function?”

  2. “This veritasium video demonstrates, that quantum waves are very real and tangible.”

    Shows quantum waves are real and tangible

    beyondCritics, 2025-03 · Recommendation · in “Did the Particle Go Through the Two Slits, or Did the Wave Function?”

  3. “Veritasium had a great video similar to this on the paths that light takes.”

    Great video with an excellent light-paths demo

    Balgair, 2025-06 · Recommendation · in “Infinite Grid of Resistors”

Excerpts from Hacker News comments, linked to the originals. Summaries and labels were written by a language model from those comments.

Topics: quantum mechanics, least action, double slit, light paths, veritasium

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