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,

Archaeologists have discovered a collection of prehistoric animal bones in Tanzania that suggests early humans figured out how to transfer tool-making techniques "from stone to bone" 1.5 million years

The bone tools date from more than a million years before our species, Homo sapiens, arose around 300,000 years ago.