Janna Levin is a theoretical physicist and cosmologist specializing in black holes, cosmology of extra dimensions, topology of the universe, and gravitational waves. Thank you for listening ❤ Check out our sponsors: https://lexfridman.com/sponsors/ep468-sb See below for timestamps, transcript, and to give feedback, submit questions, contact Lex, etc. *Transcript:* https://lexfridman.com/janna-levin-transcript *CONTACT LEX:* *Feedback* - give feedback to Lex: https://lexfridman.com/survey *AMA* - submit questions, videos or call-in: https://lexfridman.com/ama *Hiring* - join our team: https://lexfridman.com/hiring *Other* - other ways to get in touch: https://lexfridman.com/contact *EPISODE LINKS:* Janna's X: https://x.com/JannaLevin Janna's Website: https://jannalevin.com Janna's Instagram: https://instagram.com/jannalevin Janna's Substack: https://substack.com/@jannalevin Black Hole Survival Guide (book): https://amzn.to/3YkJzT5 Black Hole Blues (book): https://amzn.to/42Nw7IE How the Universe Got Its Spots (book): https://amzn.to/4m5De8k A Madman Dreams of Turing Machines (book): https://amzn.to/3GGakvd *SPONSORS:* To support this podcast, check out our sponsors & get discounts: *Brain.fm:* Music for focus. Go to https://lexfridman.com/s/brainfm-ep468-sb *BetterHelp:* Online therapy and counseling. Go to https://lexfridman.com/s/betterhelp-ep468-sb *NetSuite:* Business management software. Go to https://lexfridman.com/s/netsuite-ep468-sb *Shopify:* Sell stuff online. Go to https://lexfridman.com/s/shopify-ep468-sb *AG1:* All-in-one daily nutrition drink. Go to https://lexfridman.com/s/ag1-ep468-sb *OUTLINE:* 0:00 - Episode highlight 2:03 - Introduction 3:03 - Black holes 10:37 - Formation of black holes 21:28 - Oppenheimer and the Atomic Bomb 27:50 - Inside the black hole 40:53 - Supermassive black holes 44:22 - Physics of spacetime 47:25 - General relativity 52:56 - Gravity 1:09:29 - Information paradox 1:17:59 - Fuzzballs & soft hair 1:21:10 - ER = EPR 1:27:49 - Firewall 1:36:41 - Extra dimensions 1:39:06 - Aliens 1:54:42 - Wormholes 2:05:40 - Dark matter and dark energy 2:15:43 - Gravitational waves 2:27:51 - Alan Turing and Kurt Godel 2:40:05 - Grigori Perelman, Andrew Wiles, and Terence Tao 2:46:40 - Art and science 2:56:19 - The biggest mystery *PODCAST LINKS:* - Podcast Website: https://lexfridman.com/podcast - Apple Podcasts: https://apple.co/2lwqZIr - Spotify: https://spoti.fi/2nEwCF8 - RSS: https://lexfridman.com/feed/podcast/ - Podcast Playlist: https://www.youtube.com/playlist?list=PLrAXtmErZgOdP_8GztsuKi9nrraNbKKp4 - Clips Channel: https://www.youtube.com/lexclips *SOCIAL LINKS:* - X: https://x.com/lexfridman - Instagram: https://instagram.com/lexfridman - TikTok: https://tiktok.com/@lexfridman - LinkedIn: https://linkedin.com/in/lexfridman - Facebook: https://facebook.com/lexfridman - Patreon: https://patreon.com/lexfridman - Telegram: https://t.me/lexfridman - Reddit: https://reddit.com/r/lexfridman