Also, it's risky to try to duplicate earlier success. Magician had a certain charm to it, mostly due to my choice of lead characters, that I would be hard put to duplicate.
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Science fiction is fantasy about issues of science. Science fiction is a subset of fantasy. Fantasy predated it by several millennia. The '30s to the '50s were the golden age of science fiction - this was because, to a large degree, it was at this point that technology and science had exposed its potential without revealing the limitations.