On the Edge, Timbuktu, Part 3

Radio Expeditions: Desert Caravan Trail Offers Insight into Ancient Cultures

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An ethnobotanist travels into the Sahara to document the vanishing customs of a desert people. In the third of a four-part National Geographic Radio Expedition, NPR's Alex Chadwick follows Wade Davis to Araouane, a caravan town at least 1,000 years old.

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