Something Weird Happens When E=−mc²

Veritasium unpacks how Paul Dirac shook up physics by predicting a mirror “anti-universe” thanks to that pesky negative energy term in his equations. Starting with why the Schrödinger equation doesn’t cut it and moving through Heisenberg’s uncertainty principle, we land at Dirac’s eponymous equation—where negative-energy solutions hint at actual anti-electrons and even suggest antiparticles waltz backward in time.

Along the way we meet the charge-flipping “positron” discovery, the crash between theory and heartbreaking experimental puzzles, and the mind-bending notion of a hidden anti-world. Packed with expert insights, archive footage, and a dash of time-travel intrigue, this video shows how Dirac’s work unlocked antimatter and forever changed our understanding of the cosmos.

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