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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.
59:24ENLex Fridman· Dec 3, 2023Podcast · 2 speakersIf You Only Trust What You Can See, You Miss Most of the UniverseGuest Lisa Randall · Host Lex FridmanHarvard physicist Lisa Randall talks with Lex Fridman about dark matter, dinosaur extinctions, the LHC, and why a theory is only as good as the measurement that can kill it.
2:18:49ENLex Fridman· May 18, 2023Podcast · 2 speakersAfter the Big Bang, the universe was a thin soupGuest Anna Frebel · Host Lex FridmanMIT astrophysicist Anna Frebel tells Lex Fridman how leftover stars in the Milky Way still carry the chemistry of the first billion years, and how our galaxy grew by eating its neighbors.
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.
3:59:41ENLex Fridman· Jan 18, 2022Podcast · 2 speakersDust Covered the Origin of the UniverseGuest Brian Keating · Host Lex FridmanExperimental cosmologist Brian Keating on telescopes as time machines, the BICEP2 false alarm, and what it actually means to lose a Nobel Prize.
1:45:45ENLex Fridman· Oct 20, 2021Podcast · 2 speakersA Blink of Ordered Particles: Brian Greene on Entropy, Meaning, and DeathGuest Brian Greene · Host Lex FridmanThe Columbia physicist talks with Lex Fridman about heat death, consciousness, string theory, the Big Bang, aliens, Mars, and the kind of freedom that survives without free will.
2:22:20ENLex Fridman· May 29, 2021Podcast · 2 speakersThe closer quarks get, the weaker they pullGuest Frank Wilczek · Host Lex FridmanNobel physicist Frank Wilczek talks with Lex Fridman about asymptotic freedom, beauty, dark matter, consciousness, and whether a theory of everything would even help.
2:40:00ENLex Fridman· Nov 7, 2020Podcast · 2 speakersThe Light Never Broke the Speed Limit. Space Itself Stretched.Guest Alex Filippenko · Host Lex FridmanBerkeley astrophysicist Alex Filippenko talks dark energy, exploding stars, aliens, and how a 13.7-billion-year-old universe can be 45.7 billion light-years across.
34:50ENLex Fridman· Jul 10, 2019Podcast · 2 speakersA cheap simulation would render only you, and the wall would have nothing behind itGuest Sean Carroll · Host Lex FridmanSean Carroll walks Lex Fridman from ice-cream emergence and quantum-circuit cosmology to Fermi's paradox, the origin of life, and why academia punishes the conversations that actually change fields.
18:45ENLex FridmanPodcast · 2 speakersWhy Sean Carroll Thinks Many-Worlds Is the Cleanest Version of Quantum MechanicsGuest Sean Carroll · Host Lex FridmanThe Caltech physicist explains how Everett's idea works, answers the energy-conservation objection, and compares it with its rivals.
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.