Good science fiction/fantasy (or sci-fi/fantasy-adjacent) books for older teens? For science fiction, at this point one or both of my sons have now read books by Ray Bradbury (Martian Chronicles, Fahrenheit 451, Illustrated Man), Arthur C. Clarke (Rama series, Contact, Childhood's End), Isaac Asimov (Foundation series, Robot series, Nemesis, The Stars Like Dust, The Currents of Space, Pebble in the Sky, The End of Eternity), Frank Herbert (Dune), Larry Niven (Ringworld series), Robert Heinlein (Stranger in a Strange Land), Douglas Adams (Hitchhiker’s Guide series), Orson Scott Card (Ender series), Michael Crichton (Andromeda Strain, Sphere, Jurassic Park), Timothy Zahn (Star Wars Thrown series), Kim Stanley Robinson (Mars books), Dan Simmons (Hyperion series), Liu Cixin (Remembrance of Earth's Past trilogy), Ted Chiang (both collections), Andy Weir (The Martian, Project Hail Mary), NK Jemisin (Broken Earth series), Martha Wells (Murderbot series), John Scalzi (pretty much everything), and Neal Stephenson (pretty much everything), along with some more literary sci-fi-adjacent stuff (Vonnegut, 1984, Murakami's Hard-Boiled Wonderland and the End of the World). For fantasy, Lord of the Rings, Terry Brooks (Shannara series), Terry Pratchett (Discworld series), Philip Pullman (His Dark Materials trilogy), and Stephen King (The Stand, Dark Tower series). Also Rosemary Kirstein’s Steerswoman books. They're both big readers, I've got two summers left to fill for the older one, and I'm starting to run a little low on ideas! I don't know that they'd be all that into Ursula K. Le Guin (at least not the Hainish books; I haven’t read any Earthsea), and I was considering Iain Banks’s Culture series (I read the first one and thought it was OK, haven’t read the others yet but they seem to have a good reputation). I read Neuromancer when I was their age and vaguely recall finding it a bit hard to get into for some reason, and the only other Gibson I've read is The Peripheral (mainly because I was and still am super-annoyed at Amazon for canceling the terrific TV adaptation they started up and then dropped). Philip K. Dick would probably be good, but I haven't actually ever read any of his stuff and wouldn't know where to begin. Anyone have suggestions?