Hard to say... had you asked me this question 15 years ago, I would have answered without hesitation, The Hobbit and Ender's Game. Today, it's a bit less clear

Hard to say... had you asked me this question 15 years ago, I would have answered without hesitation, The Hobbit and Ender's Game. Today, it's a bit less clear, but here is what comes to mind. Rendezvous with Rama - Arthur C. Clarke Worthing Saga - Orson Scott Card