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Title: Great weave of history and sci-fi!
Review: I see most of the reviews are positive but the couple that aren't mention the same thing - lack of antagonistic characters. Last I checked, there were more choices than man vs man in great literature. There is also man vs nature and that is what this is all about. Nature is personified as "the past" and it is up to the protagonists to conquer nature and change the future. One of Card's best, this one really left me pondering over the possible outcomes and paradoxes.
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