Isaac Asimov wrote approximately 400 books in his life. Many of them were sci-fi, but he also wrote science books in a way that kids could understand. Thanks to Isaac Asimov I was able to get a glimpse into chemistry that I wasn't smart enough for in high school--I was in the 'Arts' stream--read bo-bo class, or at least that's what we called it. Asimov's journeys through the human body helped me understand anatomy and how the body works. He wrote a concordance to the complete works of Shakespeare and another for the Bible--old and new testaments. His limericks are fun to read, and his ability to explain the most difficult of subjects made him a fantastic teacher. He held a doctorate in biochemistry, and is AFAIK the only author to have books in all ten categories of the Dewey Decimal System.