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