From inscrutable hive-minds and pheromone poetry to star-trek fan fiction and aliens with broadswords, from 15th century ballads of lunar banishment to rousing sea monster spitfire dogfights, from near-future social commentary to hard science cosmological rewirings, gigadeath, conspiracy, catacombs, alternative history, violence and confusion, failed explorations of time, the banality of the future, love, invention, beauty, dystopia and optimism, science fiction is as diverse as it is pigeonhole …