Become a Big Think member to unlock expert classes, premium print issues, exclusive events and more: https://bigthink.com/membership/?utm_source=youtube&utm_medium=social&utm_campaign=membership&utm_content=bt-ytdesc-text-fi-khalili-8xp3Bs6nZ-Y Preorder Jim Al-Khalili's forthcoming book, On Time: The Physics That Makes the Universe, here: https://www.amazon.com/Time-Physics-That-Makes-Universe/dp/0691267030/ Subscribe to Big Think on YouTube ► https://www.youtube.com/channel/UCvQECJukTDE2i6aCoMnS-Vg?sub_confirmation=1 Up next, Brian Cox: The quantum roots of reality | Full Interview ► https://www.youtube.com/watch?v=kO41iURud9c Time feels obvious, but physics tells a stranger story about its existence: Theoretical physicist Jim Al-Khalili explores why our sense of time may be incredibly misleading, including the idea that past, present, and future might all exist at once. 0:00 Chapter 1: Does time flow? 2:42 Why Time Feels Faster as We Age 3:56 Time and Change in Philosophy and Physics 5:28 Einstein and the End of Absolute Time 6:19 Time in the Equations of Physics 7:50 Chapter 2: How do we reconcile quantum field theory with the general theory of relativity? 12:10 Evidence for Time Dilation: Muons 14:29 Gravity Slows Time: General Relativity 19:22 Space-Time and the Block Universe 21:55 Does Time Really Exist? 26:33 The Debate: Eternalism vs Presentism 34:12 Chapter 3: Is There a “Now”? 40:40 Chapter 4: Why Does Thermodynamics Have a Direction in Time? 49:38 Quantum Entanglement and the Direction of Time 55:10 Did Time Begin at the Big Bang? 45:00 Will Time End? 1:05:40 Chapter 5: Is Time Travel Possible? Read the video transcript ► https://bigthink.com/series/the-big-think-interview/block-universe-alkhalili/?utm_source=youtube&utm_medium=video&utm_campaign=youtube_description © Freethink Media Inc., All Rights Reserved. ---------------------------------------------------------------------------------- Go Deeper with Big Think: ►Become a Big Think Youtube Member Get exclusive classes and early, ad-free access to new releases without leaving Youtube. https://www.youtube.com/@bigthink/membership/ ►Become a Big Think Web Member Get the entire Big Think Class library, premium print issues, live events, and more. https://bigthink.com/membership/ ►Subscribe to Big Think on Substack Get all of your favorite Big Think content delivered to your inbox. https://bigthinkmedia.substack.com/subscribe/ ---------------------------------------------------------------------------------- About Jim Al-Khalili: Jim is a multiple award-winning science communicator renowned for his public engagement around the world through writing and broadcasting and a leading academic making fundamental contributions to theoretical physics, particularly in nuclear reaction theory, quantum effects in biology, open quantum systems and the foundations of quantum mechanics. Jim is a theoretical physicist at the University of Surrey where he holds a Distinguished Chair in physics as well as a university chair in the public engagement in science. He received his PhD in nuclear reaction theory in 1989 and has published widely in the field. His current interest is in open quantum systems and the application of quantum mechanics in biology.