Amazon: http://amzn.to/2gYlBGa 
Spoiled by reliance on robots, lacking a spirit of adventure the human colonisation of the galaxy has ground to a halt. I tend to think the Fermi Paradox is all about apathy in the end, this book might have been the seed that planted the idea.
Asimov begins tying his worlds together here with the first mention of psychohistory…