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/ Full episodes playlist: https://www.youtube.com/playlist?list=PLrAXtmErZgOdP_8GztsuKi9nrraNbKKp4 Clips playlist: https://www.youtube.com/playlist?list=PLrAXtmErZgOeciFP3CBCIEElOJeitOr41 OUTLINE: 0:00 - Introduction 1:07 - Definition of life 21:45 - Time and space 32:26 - Technosphere 36:51 - Theory of everything 45:32 - Origin of life 1:07:10 - Assembly theory 1:23:24 - Aliens 1:35:14 - Great Perceptual Filter 1:39:12 - Fashion 1:43:14 - Beauty 1:49:35 - Language 1:56:16 - Computation 2:06:03 - Consciousness 2:14:55 - Artificial life 2:38:48 - Free will 2:45:32 - Why anything exists SOCIAL: - Twitter: https://twitter.com/lexfridman - LinkedIn: https://www.linkedin.com/in/lexfridman - Facebook: https://www.facebook.com/lexfridman - Instagram: https://www.instagram.com/lexfridman - Medium: https://medium.com/@lexfridman - Reddit: https://reddit.com/r/lexfridman - Support on Patreon: https://www.patreon.com/lexfridman