#433 – Sara Walker: Physics of Life, Time, Complexity, and Aliens

Arvind Srinivas is CEO of Perplexity, a company that aims to revolutionize how we humans find answers to questions on the Internet. Please support this podcast by checking out our sponsors: - Cloaked: https://cloaked.com/lex and use code LexPod to get 25% off - ShipStation: https://shipstation.com/lex and use code LEX to get 60-day free trial - NetSuite: http://netsuite.com/lex to get free product tour - LMNT: https://drinkLMNT.com/lex to get free sample pack - Shopify: https://shopify.com/lex to get $1 per month trial - BetterHelp: https://betterhelp.com/lex to get 10% off Transcript: https://lexfridman.com/aravind-srinivas-transcript EPISODE LINKS: Aravind's X: https://x.com/AravSrinivas Perplexity: https://perplexity.ai/ Perplexity's X: https://x.com/perplexity_ai PODCAST INFO: Podcast website: https://lexfridman.com/podcast Apple Podcasts: https://apple.co/2lwqZIr Spotify: https://spoti.fi/2nEwCF8 RSS: https://lexfridman.com/feed/podcast/ YouTube Full Episodes: https://youtube.com/lexfridman YouTube Clips: https://youtube.com/lexclips SUPPORT & CONNECT: - Check out the sponsors above, it's the best way to support this podcast - Support on Patreon: https://www.patreon.com/lexfridman - Twitter: https://twitter.com/lexfridman - Instagram: https://www.instagram.com/lexfridman - LinkedIn: https://www.linkedin.com/in/lexfridman - Facebook: https://www.facebook.com/lexfridman - Medium: https://medium.com/@lexfridman OUTLINE: Here's the timestamps for the episode. On some podcast players you should be able to click the timestamp to jump to that time. (00:00) - Introduction (10:52) - How Perplexity works (18:48) - How Google works (41:16) - Larry Page and Sergey Brin (55:50) - Jeff Bezos (59:18) - Elon Musk (1:01:36) - Jensen Huang (1:04:53) - Mark Zuckerberg (1:06:21) - Yann LeCun (1:13:07) - Breakthroughs in AI (1:29:05) - Curiosity (1:35:22) - $1 trillion dollar question (1:50:13) - Perplexity origin story (2:05:25) - RAG (2:27:43) - 1 million H100 GPUs (2:30:15) - Advice for startups (2:42:52) - Future of search (3:00:29) - Future of AI

Sara Walker is an astrobiologist and theoretical physicist. She is the author of a new book titled "Life as No One Knows It: The Physics of Life's Emergence". Please support this podcast by checking out our sponsors: - Notion: https://notion.com/lex - Motific: https://motific.ai - Shopify: https://shopify.com/lex to get $1 per month trial - BetterHelp: https://betterhelp.com/lex to get 10% off - AG1: https://drinkag1.com/lex to get 1 month supply of fish oil Transcript: https://lexfridman.com/sara-walker-3-transcript EPISODE LINKS: Sara's Book - Life as No One Knows It: https://amzn.to/3wVmOe1 Sara's X: https://x.com/Sara_Imari Sara's Instagram: https://instagram.com/alien_matter PODCAST INFO: Podcast website: https://lexfridman.com/podcast Apple Podcasts: https://apple.co/2lwqZIr Spotify: https://spoti.fi/2nEwCF8 RSS: https://lexfridman.com/feed/podcast/ YouTube Full Episodes: https://youtube.com/lexfridman YouTube Clips: https://youtube.com/lexclips SUPPORT & CONNECT: - Check out the sponsors above, it's the best way to support this podcast - Support on Patreon: https://www.patreon.com/lexfridman - Twitter: https://twitter.com/lexfridman - Instagram: https://www.instagram.com/lexfridman - LinkedIn: https://www.linkedin.com/in/lexfridman - Facebook: https://www.facebook.com/lexfridman - Medium: https://medium.com/@lexfridman OUTLINE: Here's the timestamps for the episode. On some podcast players you should be able to click the timestamp to jump to that time. (00:00) - Introduction (10:40) - Definition of life (31:18) - Time and space (42:00) - Technosphere (46:25) - Theory of everything (55:06) - Origin of life (1:16:44) - Assembly theory (1:32:58) - Aliens (1:44:48) - Great Perceptual Filter (1:48:45) - Fashion (1:52:47) - Beauty (1:59:08) - Language (2:05:50) - Computation (2:15:37) - Consciousness (2:24:28) - Artificial life (2:48:21) - Free will (2:55:05) - Why anything exists

Kevin Spacey is a two-time Oscar-winning actor, who starred in Se7en, the Usual Suspects, American Beauty, and House of Cards, creating haunting performances of characters who often embody the dark side of human nature. Please support this podcast by checking out our sponsors: - ExpressVPN: https://expressvpn.com/lexpod to get 3 months free - Eight Sleep: https://eightsleep.com/lex to get $350 off - BetterHelp: https://betterhelp.com/lex to get 10% off - Shopify: https://shopify.com/lex to get $1 per month trial - AG1: https://drinkag1.com/lex to get 1 month supply of fish oil Transcript: https://lexfridman.com/kevin-spacey-transcript EPISODE LINKS: Kevin's X: https://x.com/KevinSpacey Kevin's Instagram: https://www.instagram.com/kevinspacey Kevin's YouTube: https://youtube.com/kevinspacey Kevin's Website: https://kevinspacey.com/ PODCAST INFO: Podcast website: https://lexfridman.com/podcast Apple Podcasts: https://apple.co/2lwqZIr Spotify: https://spoti.fi/2nEwCF8 RSS: https://lexfridman.com/feed/podcast/ YouTube Full Episodes: https://youtube.com/lexfridman YouTube Clips: https://youtube.com/lexclips SUPPORT & CONNECT: - Check out the sponsors above, it's the best way to support this podcast - Support on Patreon: https://www.patreon.com/lexfridman - Twitter: https://twitter.com/lexfridman - Instagram: https://www.instagram.com/lexfridman - LinkedIn: https://www.linkedin.com/in/lexfridman - Facebook: https://www.facebook.com/lexfridman - Medium: https://medium.com/@lexfridman OUTLINE: Here's the timestamps for the episode. On some podcast players you should be able to click the timestamp to jump to that time. (00:00) - Introduction (10:14) - Seven (13:54) - David Fincher (21:46) - Brad Pitt and Morgan Freeman (27:15) - Acting (35:40) - Improve (44:24) - Al Pacino (48:07) - Jack Lemmon (57:25) - American Beauty (1:17:34) - Mortality (1:20:22) - Allegations (1:38:19) - House of Cards (1:56:55) - Jack Nicholson (1:59:57) - Mike Nichols (2:05:30) - Christopher Walken (2:12:38) - Father (2:21:30) - Future

Roman Yampolskiy is an AI safety researcher and author of a new book titled AI: Unexplainable, Unpredictable, Uncontrollable. Please support this podcast by checking out our sponsors: - Yahoo Finance: https://yahoofinance.com - MasterClass: https://masterclass.com/lexpod to get 15% off - NetSuite: http://netsuite.com/lex to get free product tour - LMNT: https://drinkLMNT.com/lex to get free sample pack - Eight Sleep: https://eightsleep.com/lex to get $350 off Transcript: https://lexfridman.com/roman-yampolskiy-transcript EPISODE LINKS: Roman's X: https://twitter.com/romanyam Roman's Website: http://cecs.louisville.edu/ry Roman's AI book: https://amzn.to/4aFZuPb PODCAST INFO: Podcast website: https://lexfridman.com/podcast Apple Podcasts: https://apple.co/2lwqZIr Spotify: https://spoti.fi/2nEwCF8 RSS: https://lexfridman.com/feed/podcast/ YouTube Full Episodes: https://youtube.com/lexfridman YouTube Clips: https://youtube.com/lexclips SUPPORT & CONNECT: - Check out the sponsors above, it's the best way to support this podcast - Support on Patreon: https://www.patreon.com/lexfridman - Twitter: https://twitter.com/lexfridman - Instagram: https://www.instagram.com/lexfridman - LinkedIn: https://www.linkedin.com/in/lexfridman - Facebook: https://www.facebook.com/lexfridman - Medium: https://medium.com/@lexfridman OUTLINE: Here's the timestamps for the episode. On some podcast players you should be able to click the timestamp to jump to that time. (00:00) - Introduction (09:12) - Existential risk of AGI (15:25) - Ikigai risk (23:37) - Suffering risk (27:12) - Timeline to AGI (31:44) - AGI turing test (37:06) - Yann LeCun and open source AI (49:58) - AI control (52:26) - Social engineering (54:59) - Fearmongering (1:04:49) - AI deception (1:11:23) - Verification (1:18:22) - Self-improving AI (1:30:34) - Pausing AI development (1:36:51) - AI Safety (1:46:35) - Current AI (1:51:58) - Simulation (1:59:16) - Aliens (2:00:50) - Human mind (2:07:10) - Neuralink (2:16:15) - Hope for the future (2:20:11) - Meaning of life

Charan Ranganath is a psychologist and neuroscientist at UC Davis, specializing in human memory. He is the author of a new book titled Why We Remember. Please support this podcast by checking out our sponsors: - Riverside: https://creators.riverside.fm/LEX and use code LEX to get 30% off - ZipRecruiter: https://ziprecruiter.com/lex - Notion: https://notion.com/lex - MasterClass: https://masterclass.com/lexpod to get 15% off - Shopify: https://shopify.com/lex to get $1 per month trial - LMNT: https://drinkLMNT.com/lex to get free sample pack Transcript: https://lexfridman.com/charan-ranganath-transcript EPISODE LINKS: Charan's X: https://x.com/CharanRanganath Charan's Instagram: https://instagram.com/thememorydoc Charan's Website: https://charanranganath.com Why We Remember (book): https://amzn.to/3WzUF6x Charan's Google Scholar: https://scholar.google.com/citations?user=ptWkt1wAAAAJ Dynamic Memory Lab: https://dml.ucdavis.edu/ PODCAST INFO: Podcast website: https://lexfridman.com/podcast Apple Podcasts: https://apple.co/2lwqZIr Spotify: https://spoti.fi/2nEwCF8 RSS: https://lexfridman.com/feed/podcast/ YouTube Full Episodes: https://youtube.com/lexfridman YouTube Clips: https://youtube.com/lexclips SUPPORT & CONNECT: - Check out the sponsors above, it's the best way to support this podcast - Support on Patreon: https://www.patreon.com/lexfridman - Twitter: https://twitter.com/lexfridman - Instagram: https://www.instagram.com/lexfridman - LinkedIn: https://www.linkedin.com/in/lexfridman - Facebook: https://www.facebook.com/lexfridman - Medium: https://medium.com/@lexfridman OUTLINE: Here's the timestamps for the episode. On some podcast players you should be able to click the timestamp to jump to that time. (00:00) - Introduction (10:18) - Experiencing self vs remembering self (23:59) - Creating memories (33:31) - Why we forget (41:08) - Training memory (51:37) - Memory hacks (1:03:26) - Imagination vs memory (1:12:44) - Memory competitions (1:22:33) - Science of memory (1:37:48) - Discoveries (1:48:52) - Deja vu (1:54:09) - False memories (2:14:14) - False confessions (2:18:00) - Heartbreak (2:25:34) - Nature of time (2:33:15) - Brain–computer interface (BCI) (2:47:19) - AI and memory (2:57:33) - ADHD (3:04:30) - Music (3:14:15) - Human mind

Paul Rosolie is a naturalist, explorer, author, and founder of Junglekeepers, dedicating his life to protecting the Amazon rainforest. Support his efforts at https://junglekeepers.org Please support this podcast by checking out our sponsors: - ShipStation: https://shipstation.com/lex and use code LEX to get 60-day free trial - Yahoo Finance: https://yahoofinance.com - BetterHelp: https://betterhelp.com/lex to get 10% off - NetSuite: http://netsuite.com/lex to get free product tour - Eight Sleep: https://eightsleep.com/lex to get $350 off - Shopify: https://shopify.com/lex to get $1 per month trial Transcript: https://lexfridman.com/paul-rosolie-2-transcript EPISODE LINKS: Paul's Instagram: https://instagram.com/paulrosolie Junglekeepers: https://junglekeepers.org Paul's Website: https://paulrosolie.com Mother of God (book): https://amzn.to/3ww2ob1 PODCAST INFO: Podcast website: https://lexfridman.com/podcast Apple Podcasts: https://apple.co/2lwqZIr Spotify: https://spoti.fi/2nEwCF8 RSS: https://lexfridman.com/feed/podcast/ YouTube Full Episodes: https://youtube.com/lexfridman YouTube Clips: https://youtube.com/lexclips SUPPORT & CONNECT: - Check out the sponsors above, it's the best way to support this podcast - Support on Patreon: https://www.patreon.com/lexfridman - Twitter: https://twitter.com/lexfridman - Instagram: https://www.instagram.com/lexfridman - LinkedIn: https://www.linkedin.com/in/lexfridman - Facebook: https://www.facebook.com/lexfridman - Medium: https://medium.com/@lexfridman OUTLINE: Here's the timestamps for the episode. On some podcast players you should be able to click the timestamp to jump to that time. (00:00) - Introduction (12:29) - Amazon jungle (14:47) - Bushmaster snakes (26:13) - Black caiman (44:33) - Rhinos (47:47) - Anacondas (1:18:04) - Mammals (1:30:10) - Piranhas (1:41:00) - Aliens (1:58:45) - Elephants (2:10:02) - Origin of life (2:23:21) - Explorers (2:36:38) - Ayahuasca (2:45:03) - Deep jungle expedition (2:59:09) - Jane Goodall (3:01:41) - Theodore Roosevelt (3:12:36) - Alone show (3:22:23) - Protecting the rainforest (3:38:36) - Snake makes appearance (3:46:47) - Uncontacted tribes (4:00:11) - Mortality (4:01:39) - Steve Irwin (4:09:18) - God

Sean Carroll is a theoretical physicist, author, and host of Mindscape podcast. Please support this podcast by checking out our sponsors: - HiddenLayer: https://hiddenlayer.com/lex - Cloaked: https://cloaked.com/lex and use code LexPod to get 25% off - Notion: https://notion.com/lex - Shopify: https://shopify.com/lex to get $1 per month trial - NetSuite: http://netsuite.com/lex to get free product tour Transcript: https://lexfridman.com/sean-carroll-3-transcript EPISODE LINKS: Sean's Website: https://preposterousuniverse.com Mindscape Podcast: https://www.preposterousuniverse.com/podcast/ Sean's YouTube: https://youtube.com/@seancarroll Sean's Patreon: https://www.patreon.com/seanmcarroll Sean's Twitter: https://twitter.com/seanmcarroll Sean's Instagram: https://instagram.com/seanmcarroll Sean's Papers: https://scholar.google.com/citations?user=Lfifrv8AAAAJ Sean's Books: https://amzn.to/3W7yT9N PODCAST INFO: Podcast website: https://lexfridman.com/podcast Apple Podcasts: https://apple.co/2lwqZIr Spotify: https://spoti.fi/2nEwCF8 RSS: https://lexfridman.com/feed/podcast/ YouTube Full Episodes: https://youtube.com/lexfridman YouTube Clips: https://youtube.com/lexclips SUPPORT & CONNECT: - Check out the sponsors above, it's the best way to support this podcast - Support on Patreon: https://www.patreon.com/lexfridman - Twitter: https://twitter.com/lexfridman - Instagram: https://www.instagram.com/lexfridman - LinkedIn: https://www.linkedin.com/in/lexfridman - Facebook: https://www.facebook.com/lexfridman - Medium: https://medium.com/@lexfridman OUTLINE: Here's the timestamps for the episode. On some podcast players you should be able to click the timestamp to jump to that time. (00:00) - Introduction (11:03) - General relativity (23:22) - Black holes (28:11) - Hawking radiation (32:19) - Aliens (41:15) - Holographic principle (1:05:38) - Dark energy (1:11:38) - Dark matter (1:20:34) - Quantum mechanics (1:41:56) - Simulation (1:44:18) - AGI (1:58:42) - Complexity (2:11:25) - Consciousness (2:20:32) - Naturalism (2:24:49) - Limits of science (2:29:34) - Mindscape podcast (2:39:29) - Einstein

Neil Adams is a judo world champion, 2-time Olympic silver medalist, 5-time European champion, and often referred to as the Voice of Judo. Please support this podcast by checking out our sponsors: - ZipRecruiter: https://ziprecruiter.com/lex - Eight Sleep: https://eightsleep.com/lex to get special savings - MasterClass: https://masterclass.com/lexpod to get 15% off - LMNT: https://drinkLMNT.com/lex to get free sample pack - NetSuite: http://netsuite.com/lex to get free product tour Transcript: https://lexfridman.com/neil-adams-transcript EPISODE LINKS: Neil's Instagram: https://instagram.com/naefighting Neil's YouTube: https://youtube.com/NAEffectiveFighting Neil's TikTok: https://tiktok.com/@neiladamsmbe Neil's Facebook: https://facebook.com/NeilAdamsJudo Neil's X: https://x.com/NeilAdamsJudo Neil's Website: https://naeffectivefighting.com Neil's Podcast: https://naeffectivefighting.com/podcasts/the-dojo-collective-podcast A Life in Judo (book): https://amzn.to/4d3DtfB A Game of Throws (audiobook): https://amzn.to/4aA2WeJ PODCAST INFO: Podcast website: https://lexfridman.com/podcast Apple Podcasts: https://apple.co/2lwqZIr Spotify: https://spoti.fi/2nEwCF8 RSS: https://lexfridman.com/feed/podcast/ YouTube Full Episodes: https://youtube.com/lexfridman YouTube Clips: https://youtube.com/lexclips SUPPORT & CONNECT: - Check out the sponsors above, it's the best way to support this podcast - Support on Patreon: https://www.patreon.com/lexfridman - Twitter: https://twitter.com/lexfridman - Instagram: https://www.instagram.com/lexfridman - LinkedIn: https://www.linkedin.com/in/lexfridman - Facebook: https://www.facebook.com/lexfridman - Medium: https://medium.com/@lexfridman OUTLINE: Here's the timestamps for the episode. On some podcast players you should be able to click the timestamp to jump to that time. (00:00) - Introduction (09:13) - 1980 Olympics (26:35) - Judo explained (34:40) - Winning (52:54) - 1984 Olympics (1:01:55) - Lessons from losing (1:17:37) - Teddy Riner (1:37:12) - Training in Japan (1:52:51) - Jiu jitsu (2:03:59) - Training (2:27:18) - Advice for beginners

Edward Gibson is a psycholinguistics professor at MIT and heads the MIT Language Lab. Please support this podcast by checking out our sponsors: - Yahoo Finance: https://yahoofinance.com - Listening: https://listening.com/lex and use code LEX to get one month free - Policygenius: https://policygenius.com/lex - Shopify: https://shopify.com/lex to get $1 per month trial - Eight Sleep: https://eightsleep.com/lex to get special savings Transcript: https://lexfridman.com/edward-gibson-transcript EPISODE LINKS: Edward's X: https://x.com/LanguageMIT TedLab: https://tedlab.mit.edu/ Edward's Google Scholar: https://scholar.google.com/citations?user=4FsWE64AAAAJ TedLab's YouTube: https://youtube.com/@Tedlab-MIT PODCAST INFO: Podcast website: https://lexfridman.com/podcast Apple Podcasts: https://apple.co/2lwqZIr Spotify: https://spoti.fi/2nEwCF8 RSS: https://lexfridman.com/feed/podcast/ YouTube Full Episodes: https://youtube.com/lexfridman YouTube Clips: https://youtube.com/lexclips SUPPORT & CONNECT: - Check out the sponsors above, it's the best way to support this podcast - Support on Patreon: https://www.patreon.com/lexfridman - Twitter: https://twitter.com/lexfridman - Instagram: https://www.instagram.com/lexfridman - LinkedIn: https://www.linkedin.com/in/lexfridman - Facebook: https://www.facebook.com/lexfridman - Medium: https://medium.com/@lexfridman OUTLINE: Here's the timestamps for the episode. On some podcast players you should be able to click the timestamp to jump to that time. (00:00) - Introduction (10:53) - Human language (14:59) - Generalizations in language (20:46) - Dependency grammar (30:45) - Morphology (39:20) - Evolution of languages (42:40) - Noam Chomsky (1:26:46) - Thinking and language (1:40:16) - LLMs (1:53:14) - Center embedding (2:19:42) - Learning a new language (2:23:34) - Nature vs nurture (2:30:10) - Culture and language (2:44:38) - Universal language (2:49:01) - Language translation (2:52:16) - Animal communication

Andrew Callaghan is the host of Channel 5 on YouTube, where he does street interviews with fascinating humans at the edges of society, the so-called vagrants, vagabonds, runaways, outlaws, from QAnon adherents to Phish heads to O Block residents and much more. Please support this podcast by checking out our sponsors: - ShipStation: https://shipstation.com/lex and use code LEX to get 60-day free trial - BetterHelp: https://betterhelp.com/lex to get 10% off - LMNT: https://drinkLMNT.com/lex to get free sample pack - MasterClass: https://masterclass.com/lexpod to get 15% off - AG1: https://drinkag1.com/lex to get 1 month supply of fish oil Transcript: https://lexfridman.com/andrew-callaghan-transcript EPISODE LINKS: Channel 5 with Andrew Callaghan: https://www.youtube.com/channel5YouTube Andrew's Instagram: https://instagram.com/andreww.me Andrew's Website: https://andrew-callaghan.com/ Andrew's Patreon: https://www.patreon.com/channel5 This Place Rules: https://www.hbo.com/movies/this-place-rules Books Mentioned: On the Road: https://amzn.to/4aLPLHi Siddhartha: https://amzn.to/49rthKz PODCAST INFO: Podcast website: https://lexfridman.com/podcast Apple Podcasts: https://apple.co/2lwqZIr Spotify: https://spoti.fi/2nEwCF8 RSS: https://lexfridman.com/feed/podcast/ YouTube Full Episodes: https://youtube.com/lexfridman YouTube Clips: https://youtube.com/lexclips SUPPORT & CONNECT: - Check out the sponsors above, it's the best way to support this podcast - Support on Patreon: https://www.patreon.com/lexfridman - Twitter: https://twitter.com/lexfridman - Instagram: https://www.instagram.com/lexfridman - LinkedIn: https://www.linkedin.com/in/lexfridman - Facebook: https://www.facebook.com/lexfridman - Medium: https://medium.com/@lexfridman OUTLINE: Here's the timestamps for the episode. On some podcast players you should be able to click the timestamp to jump to that time. (00:00) - Introduction (08:53) - Walmart (10:24) - Early life (29:14) - Hitchhiking (40:49) - Couch surfing (49:50) - Quarter Confessions (1:07:33) - Burning Man (1:22:44) - Protests (1:28:17) - Jon Stewart (1:31:13) - Fame (1:44:31) - Jan 6 (1:48:15) - QAnon (1:54:00) - Alex Jones (2:10:52) - Politics (2:20:29) - Response to allegations (2:37:28) - Channel 5 (2:43:04) - Rap (2:44:51) - O Block (2:48:47) - Crip Mac (2:51:59) - Aliens