You do realize that sci-fi is science and politics in a palatable package of speculative fiction, don't you? Some of the most profound theories and issues mankind faces have been best dealt with in the arena of science fiction. Read some Philip K. Dick, some Jerry Pournelle, and some Greg Bear. Add a little Larry Niven and, for the sake of newer thinkers, some William Gibson and China Mieville. Out of a nod for the past which seems so present, read Huxley and Wells, Orwell and even Rand's Anthem. Some of the best thinking on the human condition going happens in the medium of science fiction.
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