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Post-apocalyptic stories are set well after some vast upheaval. Rather than showing the immediate aftermath, these tales depict a new society that has arisen from the ashes, usually here on Earth. Often the survivors remain leery of technology, as in Edgar Pangborn's classic novel Davy. (Its Holy Murcan Church maintains a ban on gunpowder, along with "anything else that might reasonably be construed to contain atoms.")