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Methuselah's Children is a science fiction novel by Robert A. Heinlein, originally serialized in Astounding Science Fiction in the July, August, and September 1941 issues. It was expanded into a full-length novel in 1958. The novel is usually considered to be part of Heinlein's Future History series of stories. It …

Off the Main Sequence: The Other Science Fiction Stories of Robert A. Heinlein is a collection of 27 Robert A. Heinlein short stories, including three that Heinlein never collected in book form. The title is a play on the astronomy concept off the main sequence.