In 1895, Wells became an overnight literary sensation with the publication of the novel The Time Machine. The book was about an English scientist who develops a time travel machine. While entertaining, the work also explored social and scientific topics, from class conflict to evolution. These themes recurred in some of his other popular works from this time.
Russian:  January 2, 1920– April 6, 1992, was an American author and professor of biochemistry at Boston University, best known for his works of science fiction and for his popular science books. Asimov was one of the most prolific writers of all time, having written or edited more than 500 books and an estimated 90,000 letters and postcards.Â
The Galactic Empire novels are explicitly set in earlier history of the same fictional universe as the Foundation Series. Later, beginning with Foundation’s Edge, he linked this distant future to the Robot and Spacer stories, creating a unified “future history” for his stories much like those pioneered by Robert A.
The prolific Asimov also wrote mysteries and fantasy, as well as much non-fiction. Most of his popular science books explain scientific concepts in a historical way, going as far back as possible to a time when the science in question was at its simplest stage.
SCIENCE-FICTION 
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