Chapter 7

"Third Level; probability of abortive attempt to colonize this planet from Mars about a hundred thousand years ago," he said. "A few survivors--a shipload or so--were left to shift for themselves while the parent civilization on Mars died out. They lost all vestiges of their original Martian culture, even memory of their extraterrestrial origin. About fifteen hundred to two thousand years ago, a reasonably high electrochemical civilization developed and they began working with nuclear energy and developed reaction-…