Galouye, Daniel F. -- Dark Universe

No memory of this at all. Oh! Right, it's the post-holocaust one about a group of people living in total darkness. High-concept and imaginatively done, and from 1961 when that was unusual. They have what we'd call superhuman audio discernment, and navigate via sonar (clicking rocks together or whatever's at hand). Then the higher-tech surface survivors come with flashlights and bring them back to civilization, and they lose the hearing talents. I wanted there to be irony in this, but I couldn't find any. Good book though.


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