A child's tooth and mysterious green stones expose a 5,500-year-old secret hidden in a mountain cave

High in the Spanish Pyrenees, at an altitude where steep slopes and rocky terrain still make access difficult today, archaeologists have been investigating a cave that appears to have drawn people back again and again over thousands of years. Known as Cova del Sardo, the site has yielded evidence of prehistoric expeditions, early copper mining activities, and a collection of puzzling artefacts that include green mineral stones and the tooth of a child.

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