Sir Martin what a legend ! Thank you for your valuable insights! Normally it takes me 2 or 3 sittings to get through a podcast. But like a fine wine or good book I couldn't put this one down. Got through it in 1 sitting. Super fascinating discussion ! Thanks Lex you also come up with many valuable insights, push backs and questions too , But didn't hear you ask him, how does an 80 year old stay so, sharp, witty, smart, and happy. Great podcast thanks ! Btw I have the explorer gene ! I'm keen to go to Mars even if I might not come back. If you have a space ship full of Robots even with longer distances to travel. It would help to have a few humans on board just in case. Just like some fishing boats have specialist observers to ensure safe and reasonable practices and processes and ensure the maintenance of communication systems with the command center. The same and or similar principles apply. Our small human team could take shifts in and out of cryogenic sleep or extended scientifically aided sleep.