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The sun is scorching. The land is nearly barren. And the only hint of rain comes from the sound of wind rustling cactus spines, trickle trickle trickle. You are in the Brazilian Caatinga, home to one of the greatest concentrations of rock art, or pinturas rupestres, in the world. The open-air rock shelters and towering sandstone cliffs are living canvases of ancient paintings from the Upper Paleolithic Period to the Neolithic (50,000–8,000 bce). A nearly...