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The early stage is hard-core farming: building shelters, digging water storage tanks, smoking dried fish, and planting yams. In the middle period, it suddenly cuts into science fiction: underground cities, survivors of nuclear war, thorium-based molten salt reactors, and space-time tunnels. The two styles are seamlessly connected and not inconsistent at all. If you like the apocalyptic reconstruction of "Earth's Hundred Sons" and the time and space setting of "Interstellar", this book will definitely suit your appetite!