A series of handprints discovered in Tibet is puzzling researchers. Their placement feels intentional, and that’s exactly what makes them so intriguing. Handprints and footprints pressed into stone on the Tibetan Plateau may represent the oldest known artistic expression, dating back between 169,000 and 226,000 years. Discovered near Quesang village, about 80 kilometers northwest of Lhasa, the impres... [2258 chars]