I'll toss my recommendation on the pile as well. _The Moon is a Harsh Mistress_ is one of my all-time favorite books, up there with Twain's _Connecticut Yankee_. Life on the moon is completely alien, but completely withing our ability to visualize and understand since we have actually been there and studied what it might take to live there.
Ironically, the Loonies manage to create libertopia there, as the inmates of the asylum. Heinlein challenges us to really understand and internalize and embrace the concepts of libertopia in the same way we manage to understand the mechanics of lunar life.
I should go re-read it now...
I'm voting for Peace.
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