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In page Robert A. Heinlein:
"Heinlein is often credited with bringing serious writing techniques to the genre of science fiction. For example, when writing about fictional worlds, previous authors were often limited by the reader's existing knowledge of a typical "space opera" setting, leading to a relatively low creativity level: The same starships, death rays, and horrifying rubbery aliens becoming ubiquitous.[citation needed] This was necessary unless the author was willing to go into long expositions about the setting of the story, at a time when the word count was at a premium in SF.[citation needed]
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