TL;DR

Veritasium’s “Something Weird Happens When E=−mc²” dives into Paul Dirac’s mind-bending journey from the Schrödinger and Klein–Gordon equations to the powerhouse Dirac equation that predicted the positron—and, by extension, a whole anti-universe where particles travel backward in time. Along the way you’ll get clear takes on negative energy, Heisenberg’s uncertainty principle, and the saddest chapter in modern physics before the anti-electron made history.

Featuring expert insights from Graham Farmelo and Cumrun Vafa, plus archival gems from Florida State University and Caltech, this video is brought to you by Hostinger (code VERITASIUM), Veritasium’s tabletop game backers, and a huge cast of researchers, animators, and Patreon supporters. For deeper dives, check out the references and visuals links in the description!

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