Sara Walker is an astrobiologist and theoretical physicist interested in the origin of life. Please support this podcast by checking out our sponsors: - Athletic Greens: https://athleticgreens.com/lex and use code LEX to get 1 month of fish oil - NetSuite: http://netsuite.com/lex to get free product tour - Blinkist: https://blinkist.com/lex and use code LEX to get 25% off premium - Magic Spoon: https://magicspoon.com/lex and use code LEX to get $5 off EPISODE LINKS: Sara's Twitter: https://twitter.com/Sara_Imari Sara's Website: http://emergence.asu.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/ Full episodes playlist: https://www.youtube.com/playlist?list=PLrAXtmErZgOdP_8GztsuKi9nrraNbKKp4 Clips playlist: https://www.youtube.com/playlist?list=PLrAXtmErZgOeciFP3CBCIEElOJeitOr41 OUTLINE: 0:00 - Introduction 1:53 - Origin of life 9:46 - Did aliens seed life on Earth? 14:57 - What is life? 26:36 - Cellular automata 31:04 - The laws of physics may change with time 40:50 - Nobel Prize for the origin of life 46:09 - Is consciousness fundamental to the universe? 57:28 - Life is the most deterministic part of physics 1:00:03 - Free will 1:08:20 - How to detect alien life 1:22:57 - How many alien civilization are out there? 1:29:41 - Shadow biosphere 1:36:08 - UFO sightings 1:39:43 - Exponential population growth of AI lifeforms 1:46:50 - The role of death in life 1:50:54 - Advice for young people 1:56:40 - Meaning of life 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