How Paul Dirac uncovered the anti-universe. Sponsored by Hostinger - visit https://ve42.co/hostinger and use the code VERITASIUM to get an extra discount on top of the sale prices. Get your exclusive edition of Veritasium’s first tabletop game - join 8,000+ backers - https://ve42.co/did If you’re looking for a molecular modelling kit, try Snatoms, a kit I invented where the atoms snap together magnetically - https://ve42.co/SnatomsV Sign up for the Veritasium newsletter for weekly science updates - https://ve42.co/Newsletter ▀▀▀ A huge thank you to Graham Farmelo and Cumrun Vafa for their invaluable expertise and contributions to this video. If you want to hear more about Dirac's life we've posted an extended interview with biographer Graham over on our patreon here - https://ve42.co/patreonbonus A special thanks to Matteo Arfini for his help with this video. Check out Graham Farmelo’s books here - https://grahamfarmelo.com/ Explore Cumrun Vafa’s research here - https://www.cumrunvafa.org/ Thank you also to Florida State University and Caltech for their fantastic archives. You can find the digitized materials from the FSU’s Paul A. M. Dirac Collection here - https://ve42.co/FSUdirac - and more about the discovery of the positron here - https://ve42.co/CalispherePositron ▀▀▀ 0:00 Can Negative Energy Exist? 3:27 The Schrödinger Equation Is Wrong 8:33 The Strangest Man In Physics 11:01 Dirac and the Klein-Gordon equation 17:27 Heisenberg’s Uncertainty Principle 20:54 The Dirac Equation 24:21 The Saddest Chapter in Modern Physics 26:35 The Anti-Electron 29:57 Antiparticles Travel Backwards In Time 31:24 The Anti-World ▀▀▀ References can be found here - https://ve42.co/DiracRefs Image and video references can be found here - https://ve42.co/DiracVisuals ▀▀▀ Special thanks to our Patreon supporters: Adam Foreman, Albert Wenger, Alex Porter, Alexander Tamas, Anton Ragin, Anupam Banerjee, armedtoe, Balkrishna Heroor, Bertrand Serlet, Blake Byers, Bruce, Dave Kircher, David Johnston, David Tseng, Evgeny Skvortsov, Garrett Mueller, Gnare, gpoly, Hayden Christensen, Ibby Hadeed, Jeromy Johnson, Jon Jamison, Juan Benet, KeyWestr, Kyi, Lee Redden, Marinus Kuivenhoven, Matthias Wrobel, Meekay, meg noah, Michael Bush, Michael Krugman, Orlando Bassotto, Paul Peijzel, Richard Sundvall, Robert Oliveira, Sam Lutfi, Tj Steyn, Ubiquity Ventures, wolfee ▀▀▀ Writers: Lily Shepherd, Casper Mebius & Derek Muller Producer & Director: Lily Shepherd Editors: Jonny Lennard Camera Operators: Casper Mebius Animators: Andrew Neet, Emma Wright, Fabio Albertelli & Peter Nelson Illustrators: Jakub Misiek & Nataly Zhuk Assistant Editors: James Horsley & James Stuart Researchers: Callum Cuttle & Sophia Rose Thumbnail Designers: Abdallah Rabah, Ren Hurley & Ben Powell Production Team: Katy Southwood & Josh Pitt Executive Producers: Derek Muller & Casper Mebius Additional video/photos supplied by Getty Images, Storyblocks Music from Epidemic Sound