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No device could prove Einstein wrong... until now

Veritasium · Oct 23, 2026

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No device could prove Einstein wrong... until now

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Can atomic clocks prove Einstein wrong? The biggest protection in the game! Go to https://NordVPN.com/veritasium and get an exclusive NordVPN deal + 4 extra months. It’s risk free with NordVPN’s 30-day money-back guarantee! 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 Huge thanks to NIST for their help making this video. Visit their website: https://www.nist.gov/pml/time-and-frequency-division Join our Patreon for a chance to get a NASA sticker that went to the edge of space during the eclipse and for early access to work-in-progress videos https://ve42.co/VePatreon Last year, we launched Elements of Truth on Kickstarter and were thrilled by the response. We’re now in the final stages of production, and Kickstarter rewards are shipping soon. If you missed the campaign, you can now pre-order the retail edition through our new website here - https://ve42.co/YTDEcl If you backed us on Kickstarter, don’t worry, your game will ship before any pre-orders are fulfilled. ▀▀▀ 0:00 Does gravity obey the rules of quantum mechanics? 2:40 How does an atomic clock work? 6:06 Why Optical Atomic Clocks Are So Accurate 8:51 Using Lasers To Cool Atoms Down 13:47 Driving an atomic clock up a mountain 17:01 Linking Atomic Clocks Across 80 Kilometres 19:00 Flying an Atomic Clock in a Helicopter 25:11 How Do You Measure the Frequency of Light? 28:40 Optical Frequency Combs 30:42 Is Einstein Still Right? ▀▀▀ With special thanks to the experts and collaborators who made this video possible: In order of appearance, Prof. Jonathan Oppenheim (University College London), Greg Hoth (NIST), Dr. Andrew Ludlow (NIST), Dr. Laura Sinclair (NIST), Dr. Harikesh Ranganath (NIST), Lilani Toms-Hardman (University of Western Australia), Prof. Sascha Schediwy (University of Western Australia), Dr Sabrina Slimani (University of Western Australia), Dr Benjamin Dix-Matthews (University of Western Australia). The National Institute of Standards and Technology (NIST), the University of Denver and the Meyer-Womble Observatory, the University of Western Australia and the International Centre for Radio Astronomy Research, RIKEN and the University of Tokyo. In addition, to the Precision Measurement Group (PMG) in the Institute for Photonics, Advanced Sensing and Quantum Technologies (IPAS-QT) at Adelaide University who provided the two portable atomic clocks used in the UWA test. https://ve42.co/AdelaideUniversityPrecisionMeasurementGroup In the production of this video, Rebecca Jacobson, Dr. Emily Caldwell, Dr. Kyle Latty (NIST), Nicholas Kurth, University of Colorado (Boulder), Dr. Bryn Crawford (Adelaide University), Prof. Hidetoshi Katori, A/Prof. Kai Suekane, Dr. Shota Yo and Dr. Hiutat Yang (RIKEN & University of Tokyo). In additional research and review, Prof. David Kaiser (MIT), Prof. Scott Diddams (University of Colorado Boulder), Prof. Claudia de Rham (Imperial College London), Prof. Steven Cundiff (University of Michigan) and Dr. Derek van Westrum (NOAA National Geodetic Survey). For their support with archive footage, the NIST Archive, Prof. Jun Ye (NIST/JILA) and Brent Doerzman. ▀▀▀ References: https://ve42.co/AtomicClockReferences For more information on the dipole trap: https://ve42.co/HBDDipole MIT Open Access Course: https://ve42.co/FreeLecturesHere ▀▀▀ Special thanks to our Patreon supporters: Adam Foreman, Albert Wenger, Alex Porter, Alexander Tamas, André Powell, Anton Ragin, Balkrishna Heroor, Bertrand Serlet, Blake Byers, Bruce, Bryan Ackermann, Chris Brewer, Data Don, Dave Kircher, David Johnston, David Tseng, EJ Alexandra, Evgeny Skvortsov, Garrett Mueller, Gnare, gpoly, Hayden Christensen, Hong Thai Le, Hybrid Minds, Ibby Hadeed, Jeromy Johnson, Juan Benet, Kelcey Steele, KeyWestr, Kyi, Lee Redden, Marinus Kuivenhoven, Mark Heising, Martin Paull, Meekay, meg noah, Michael Krugman, Orlando Bassotto, Parsee Health, Paul Peijzel, Robson, Sam Lutfi, Shalva Bukia, Sinan Taifour, Sweet_Nemo, Tj Steyn, Ubiquity Ventures, wolfee, Burt Humburg, Sanome, Ulf Hermjakob ▀▀▀ Credits Writers: Sarah Houlton, Gregor Čavlović, Emilia Gyles Producer and Director: Sarah Houlton Presenters: Gregor Čavlović and Emilia Gyles Editor: Peter Nelson Additional Editing: James Stuart and Trenton Oliver Animators: Alex Drakoulis, Andrew Neet, Domonkos Józsa, Emma Wright and Fabio Albertelli Researchers: Sophia Rose and Gabe Strong Camera Operators: James Chance, Jesse Bartlett, Sarah Houlton, Gregor Čavlović and Emilia Gyles Thumbnail Designers: Abdallah Rabah, Daniel Ellacott and Jakub Misiek Production Team: Anna Milkovic, Glen Griffiths, Jess Bishop-Laggett, Matthew Cavanagh Executive Producers: Gregor Čavlović, Emilia Gyles and Derek Muller

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