Please recommend to me a good hard sci-fi book. I've read almost all of Arthur C Clarke and Isaac Asimov. The book can incorporate FTL speed and aliens -- I'll go that far afield. The book can be older or contemporary. But the science must be pretty sound. Likeable characters would help too. I will also entertain other types of sci-fi . . . maybe.
(NOTE: Many sci-fi books I've started to read and just couldn't take it anymore.)
(NOTE: Many sci-fi books I've started to read and just couldn't take it anymore.)