Isaac Asimov (; c. January 2, 1920 – April 6, 1992) was an American writer and professor of biochemistry at Boston University. He was known for his works of science fiction and popular science. Asimov was a prolific writer who wrote or edited more than 500 books and an estimated 90,000 letters and postcards. His books have been published in 9 of the 10 major categories of the Dewey Decimal Classification.Asimov wrote hard science fiction. Along with Robert A. Heinlein and Arthur C. Clarke, Asimov was considered one of the "Big Three" science fiction writers during his lifetime. Asimov's most famous work is the "Foundation" series, the first three books of which won the one-time Hugo Award for "Best All-Time Series" in 1966. His other major series are the "Galactic Empire" series and the Robot series. The Galactic Empire novels are set in earlier history of the same fictional universe as the Foundation series. Later, with Foundation and Earth (1986), he linked this distant future to the Robot stories, creating a unified "future history" for his stories much like those pioneered by Robert A. Heinlein and previously produced by Cordwainer Smith and Poul Anderson. He also wrote hundreds of short stories, including the social science fiction novelette "Nightfall", which in 1964 was voted the best short science fiction story of all time by the Science Fiction Writers of America. Asimov wrote the Lucky Starr series of juvenile science-fiction novels using the pen name Paul French.Asimov also wrote mysteries and fantasy, as well as much nonfiction. Most of his popular science books explain concepts in a historical way, going as far back as possible to a time when the science in question was at its simplest stage. Examples include Guide to Science, the three-volume set Understanding Physics, and Asimov's Chronology of Science and Discovery. He wrote on numerous other scientific and non-scientific topics, such as chemistry, astronomy, mathematics, history, biblical exegesis, and literary criticism.
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A couple of months ago I had a dream, which I remember with the utmost clarity. (I don't usually remember my dreams.) I dreamed I had died and gone to Heaven. I looked about and knew where I was — green fields, fleecy clouds, perfumed air, and the distant, ravishing sound of the heavenly choir. And there was the recording angel smiling broadly at me in greeting. I said in wonder, "Is this Heaven?" The recording angel said, "It is." I said (and on waking and remembering, I was proud of my integrity), "But there must be a mistake. I don't belong here. I'm an atheist." "No mistake," said the recording angel. "But as an atheist how can I qualify?" The recording angel said sternly, "We decide who qualifies. Not you." "I see," I said. I looked about, pondered for a moment, then turned to the recording angel and asked, "Is there a typewriter here that I can use?" The significance of the dream was clear to me. I felt Heaven to be the act of writing, and I have been in Heaven for over half a century, and I have always known this.