“Asimov was also unusual in the amount of non-fiction he wrote, from a guide to Shakespeare to science writing.”
Asimov’s Guide to Science not only got me through chemistry, it got me interested in science.
I saw him in a hotel lobby in New Orleans once.
Asimov’s guide to shakespeare was used middle school through college for me.
And his laws for robotics remain the simplest logical solution (if it can be implemented) for preventing a terminator.
A December XKCD comic even explained that.
http://www.xkcd.com/1613/