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Veritasium: Something Weird Happens When E= mc

Something Weird Happens When E = −mc² explores Paul Dirac’s journey from wrestling with negative‐energy solutions in the Schrödinger and Klein-Gordon equations to formulating the Dirac equation, which naturally predicted the existence of anti-electrons (positrons). Along the way it untangles Heisenberg’s uncertainty principle, the weird notion of particles traveling backward in time, and the sad story of how early physicists resisted these shocking implications.

By tracing the theory’s leap into experiment—culminating in the discovery of the positron—and pondering the idea of a full “anti-world,” the video shows how Dirac’s bold math opened up an entire mirror universe of antimatter. It’s a wild ride through quantum physics, historical archives, and the people who made the anti-universe seem inevitable.

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