Originally Posted by wallcraft
Three recommended AZW Kindle ebooks:
Three TOPAZ (probably not available as ebooks on other devices):
All 3 of those are available on the Kindle, at least. I've read Where is Everybody, and have Rare Earth but haven't read it yet. An excellent followup to Rare Earth is Ward's Life As We Do Not Know It, which covers ideas about biogenesis, the RNA world, and theoretical alternatives to protein/amino acid based life. Available as an ebook:
Really, anything you can find by Peter Douglas Ward is a winner.