Stone Age kids left their marks on cave art and stone tools
Walk about 300 meters into Rouffignac Cave in southern France, turn left into a dark chamber, raise a lantern, and gaze up at a prehistoric marvel. A welter of undulating, curving, crisscrossing lines blankets the ceiling in abstract abandon. Single, double, and triple sets of lines zigzag and run together in swirls. In other parts of the cave, similarly configured lines appear beside, inside, underneath, and on top of drawings of now-extinct mammoths. Archaeologists refer to such marks as finger flutings, the lines that human fingers leave when drawn over a soft surface. In Rouffignac Cave, finger flutings cut through pliable red clay to expose hard white limestone underneath.