A grain of truth it will glow red hot if a lie is told by anyone touching it. Of course in these more modern.

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surveyed one field and found the fragments buried in red sand across a strip thirty miles wide. From a mile or so up the edge of the structure can still be seen if you know where to look. Neither of the two previous expeditions found them. They're ours. Linker believes these ribbons once stretched clear around the planet. Before the sand storm Willy's infrared mapping proved him correct. We could trace belts of ruins in almost all the places Lowell had mapped--even the civic centers some of his followers said he saw. Aqueducts laced the planet like the ribs on a basketball meeting at ocean-sized black pools covered with glassy.
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