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/ 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 (07:44) – Origin of life (15:38) – Did aliens seed life on Earth? (20:48) – What is life? (32:27) – Cellular automata (36:56) – The laws of physics may change with time (46:41) – Nobel Prize for the origin of life (52:01) – Is consciousness fundamental to the universe? (1:03:19) – Life is the most deterministic part of physics (1:05:54) – Free will (1:14:11) – How to detect alien life (1:28:48) – How many alien civilization are out there? (1:35:32) – Shadow biosphere (1:41:59) – UFO sightings (1:45:35) – Exponential population growth of AI lifeforms (1:52:42) – The role of death in life (1:56:45) – Advice for young people (2:02:31) – Meaning of life