vaguely related there is a fantastic new PBS Space Time this week which suggests the "no alien life" fermi paradox may be related to how our mitochondria evolved by a series of fortunate accidents which may not be reproducible elsewhere<p><a href="https://www.pbs.org/video/is-there-a-simple-solution-to-the-fermi-paradox-exhglt" rel="nofollow">https://www.pbs.org/video/is-there-a-simple-solution-to-the-...</a><p>( <a href="https://www.youtube.com/watch?v=abvzkSJEhKk" rel="nofollow">https://www.youtube.com/watch?v=abvzkSJEhKk</a> )