1.5 million-year-old stone tools from mystery human relative discovered in Indonesia

Stone tools found on Sulawesi in Indonesia suggest that ancient hominins occupied the island around 1 million years ago — much earlier than we thought. The small tools were probably created using a percussion-flaking technique, in which a rock is struck with another stone to create sharp edges. Without fossils, researchers can’t tell exactly which early human species made them, but Homo erectus is a potential candidate.