Ross Hamilton has made some truly incredible discoveries about the Great Serpent Mount in Ohio. This ancient Native America earthwork has got a real mystery to reveal. Listen as Whitley finds out the answer. How does the constellation Draco figure into the story, and who, truly, does the serpent represent? Then Linda Howe explores a much more modern mystery: what are those strange, hard-packed soils scientists see in the recent Mars lander photos?
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