HOUSTON — What do hard-nosed accounting, cultural sensitivity and "story time" have to do with human missions to Mars? Perhaps as much as advanced technology, heavy-lift rockets and political backing, according to some of those devoted to achieving the goal of a human Mars landing sooner than later. The National Research Council’s June report Pathways to Exploration, more than two years in the making, suggested a cost of $400 billion to reach the red planet with humans ...


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