TL;DR

Veritasium unpacks how Paul Dirac’s bold twist on Einstein’s E=mc² led to negative‐energy solutions that upended quantum mechanics and predicted antimatter. From the Schrödinger and Klein–Gordon equations to Heisenberg’s uncertainty principle, Dirac’s eponymous equation didn’t just fix the math—it foretold the positron, an anti‐electron that behaves as if it’s traveling backward in time.

Along the way, we peek into archives at Florida State University and Caltech, meet the “strangest man in physics,” and entertain the wild notion of an entire anti‐universe mirroring our own—all thanks to Dirac’s fearless pursuit of theory and experiment.

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