67,800-year-old hand stencil (with highlight). Credit: Max Aubert A simple hand stencil found on a cave wall in Indonesia has been identified as the oldest known example of rock art on Earth. It surpasses a previous discovery in the same region by at least 15,000 years. An international research team led by Griffith University, Indonesia's national research and innovation agency (BRIN), and Southern Cross University determined that these paintings on the island of Sulawesi were created at least