Robert Anson Heinlein (; July 7, 1907 – May 8, 1988) was an American science-fiction author, aeronautical engineer, and retired Naval officer. Sometimes called the "dean of science fiction writers", he was among the first to emphasize scientific accuracy in his fiction, and was thus a pioneer of the subgenre of hard science fiction. His published works, both fiction and non-fiction, express admiration for competence and emphasize the value of critical thinking. His work continues to have an influence on the science-fiction genre, and on modern culture more generally.
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Time is not your friend. It doesn't care if you live fast or die slow, if you are or if you aren't. It was here before you arrived and it will go on after you leave. Time doesn't care who wins or who loses, if your life span is full or empty, honorable or shameful. Time is indifferent.