Ask HN: What books did you enjoy reading recently?

- Hacker News (HN) is a massively popular tech-community news aggregator and discussion forum run by the startup accelerator Y Combinator. "Ask HN" is a regular post format where any user can pose a question to the community. - This particular thread is a casual, open-ended book recommendation request — a recurring genre on HN that often surfaces works on systems thinking, programming, startups, history, science fiction, and biography. - The audience is mostly engineers, founders, and technically-minded readers, so recommendations often tilt toward non-fiction (tech, business, cognitive science, history) and "hard" sci-fi. A reply listing a book here implicitly signals that the book is respected within tech culture.