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Title: Worlds that went before us.
Review: Given our technologies, we may be falsely complacent about our level of knowledge about the native populations of our own continent. I think there is a certain amount of parochialism that dictates our feeling that a big enough, advanced civilization cannot just vanish. Therefore, we wistfully assure ourselves that our own time will not just vanish. This book takes a different view and discusses a number of societies that had established organized, technological worlds. Technology doesn't just mean computers. In the past other tools and knowledge were used to extend the reach of man, sometimes past our current ability. This is a fascinating book.
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