Well, not sci-fi, but still somehow geeky - when I was a kid, I enjoyed "Three Investigators" series: http://en.wikipedia.org/wiki/Three_Investigators http://e

Well, not sci-fi, but still somehow geeky - when I was a kid, I enjoyed "Three Investigators" series: http://en.wikipedia.org/wiki/Three_Investigators http://en.wikipedia.org/wiki/Three_Investigators Also, you can introduce him to some excellent Ostblock sci-fi authors: Stanislav Lem: "The Cyberiad" (http://en.wikipedia.org/wiki/The_Cyberiad http://en.wikipedia.org/wiki/The_Cyberiad) Arkady and Boris Strugatsky: "Monday Begins on Saturday" (http://en.wikipedia.org/wiki/Monday_Begins_on_Saturday http://en.wikipedia.org/wiki/Monday_Begins_on_Saturday)