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Lex Fridman· May 5, 2025Podcast · 2 speakersA Black Hole Is a Place, Not a ThingGuest Janna Levin · Host Lex FridmanTheoretical physicist Janna Levin tells Lex Fridman why the event horizon is empty spacetime, why Hawking’s radiation started a war over information, and why gravity itself may not be fundamental.
2:35:24ENLex Fridman· Apr 22, 2024Podcast · 2 speakersThe Equation Was Smarter Than EinsteinGuest Sean Carroll · Host Lex FridmanSean Carroll tells Lex Fridman why general relativity is the most beautiful theory in physics, and why its equation predicted black holes, gravitational waves, and the Big Bang before anyone, including Einstein, understood them.
2:19:34ENLex Fridman· Feb 15, 2023Podcast · 2 speakersEinstein Gave Black Holes a C-Minus. Strominger Still Bets the Farm on the Next WrinkleGuest Andrew Strominger · Host Lex FridmanHarvard theorist Andrew Strominger on why singularities are a gift, why string theory is a stepping stone rather than a verdict, and why the holographic principle is still imprecisely defined.
2:13:16ENLex Fridman· Jul 23, 2022Podcast · 2 speakersEvery Atom in Your Body Was Forged in a Dead StarGuest Martin Rees · Host Lex FridmanMartin Rees talks Lex Fridman through dark matter, alien life, one-way Mars trips, and why this century is the first in which one species holds the planet.
2:22:55ENLex Fridman· Aug 23, 2021Podcast · 2 speakersLIGO measures a thousandth of a proton — then a thousand physicists stayed quiet for a monthGuest Barry Barish · Host Lex FridmanNobel laureate Barry Barish tells Lex Fridman how gravitational waves were predicted, doubted, and finally heard with the most precise machine ever built.
2:51:17ENLex Fridman· Jan 13, 2021Podcast · 2 speakersOumuamua Wasn't Supposed to Exist. Avi Loeb Wants a Photograph Next Time.Guest Avi Loeb · Host Lex FridmanHarvard astrophysicist Avi Loeb tells Lex Fridman why the first interstellar visitor looks more like a lightsail than a rock — and why that question is still treated as unscientific.
57:30ENLex Fridman· Sep 26, 2019Podcast · 2 speakers400 Spins in a Pocket, and a Universe Too Small to Store ThemGuest Leonard Susskind · Host Lex FridmanLeonard Susskind tells Lex Fridman why quantum computers are not faster laptops, why string theory is a tool rather than a citizenship, and why nobody should claim to have found the bottom of the well.
12:52ENLex FridmanPodcast · 2 speakersRoger Penrose on a Universe That Restarts: When the Far Future Becomes the Next Big BangGuest Roger Penrose · Host Lex FridmanPenrose explains conformal cyclic cosmology, in which the remote future of one cosmic eon is mathematically the same as the Big Bang of the next.