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R. U. R., or Rossum's Universal Robots is a play written in 1920 by Karel Čapek, a Czech writer who wrote many plays and novels, many of them with science-fiction and dystopian themes. R. U. R. is perhaps the most well-known of these works in the English-speaking world because it brought the word "robot" into the language. "Robot" is derived from the Czech word meaning "worker."