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For such a foundational book to the sci fi genre, this book really does not hold up well. The main character is utterly insufferable in his ego, and the only females characters are so one dimensional. While one of the women does serve a grander part of the lesson/plot, it is entirely outside of her agency, and for most of the book she (and the other woman) serve as little more than sexual fodder for the main character, and constantly portrayed as dumb and naive. I appreciate what Ringworld contributed to the sci fi genre, but it was really not worth my time reading.