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Another vote for 'Lord of Light'. Just about anything by Zelazny's gonna make you stop and think.
'Starship Troopers' is good, but for thought provoking Heinlein you gotta go with 'Job'. Incredible book for making you think.
I'd also recommend science fiction by L. Neil Smith. Libertarian science fiction that manages to be entertaining and thought-provoking all at once.
I also really like anything by Harlan Ellison. He writes short fiction and essays mostly, but any one of his collections will give you plenty of material to ponder.
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