TL;DR

Veritasium dives into Paul Dirac’s mind-bending discovery that flipping the sign on E=mc² leads to a whole “anti-universe” of negative-energy solutions. Starting from the flawed Schrödinger equation and Klein–Gordon’s pitfalls, you get introduced to the Dirac equation, the birth of the positron, and the wild notion that antiparticles might literally be rushing backwards through time.

Along the way, the video unpacks Heisenberg’s uncertainty principle, the “saddest chapter” in modern physics, and how Dirac’s theoretical leap paved the way for antimatter and the tantalizing idea of an anti-world.

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