Early humans began crafting stone tools more than 3 million years ago by chipping off flakes to form shapes and sharp edges in a process known as knapping. There was previously no evidence that our ancestors transferred those knapping skills to bone until around 400,

The oldest human-crafted bone tools on record are 1.5 million years old, a finding that suggests our ancestors were much smarter than previously thought, a new study reports. The tools, made from hippo and elephant leg bones, were discovered at Olduvai Gorge in Tanzania and are a million years older than any previously found shaped bone tools.

Scientists discovered world's oldest known bone tools in Tanzania, revealing early human intelligence and innovation 1.5 million years ago.