Hard science fiction fans are discussing various book recommendations, with Ben Bova's "Farside" highlighted as an enjoyable read. Notable mentions include works by authors like Stanislaw Lem, Greg Egan, and Andy Weir, particularly praising Egan for his rigorous scientific detail and Weir's engaging storytelling in "The Martian." The conversation also touches on the definition of hard sci-fi, debating whether elements like faster-than-light travel can still fit within the genre if presented believably. Additionally, several hard sci-fi films are recommended, including "Gravity," "Interstellar," and "Primer." Overall, the thread emphasizes a shared enthusiasm for scientifically grounded narratives in literature and film.