Re Hard v soft SF. Hard SF tends to be written by scientists and the science tends to take on the role one of the characters. Prime example is Anderson's Tau Zero where a complex formula involving velocity over speed of light which creates a situation that drives the plot of the novel. Sounds a lot heavier than it is! Soft SF tends to be written by non-scientists, the likes of Philip K Dick, Brian Aldiss, J. G. Ballard etc and is more concerned with the social aspects of the situation and less driven by scientific plausibility- I call such Social Fiction and to me is less appealing in general (but not always) than the hard stuff.
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