A neatly-laid out sequence of five handprints and five footprints found near the village of Quesang in Tibet is being hailed as the world's oldest human art. The fossilized indentations were etched on travertine — pliable limestone formed by deposits from natural springs that harden over time. Based on the dimensions, the researchers believe the footprints belonged to a seven-year-old, while the handprints were those of a 12-year-old.