A cache of 1.5 million-year-old bone tools uncovered in Tanzania suggest ancient human ancestors were capable of critical thinking and advanced craftsmanship.

Even older artifacts recovered at Olduvai Gorge come from a bone tool kit, the scientists say. Implements of varying sizes and shapes were identified as pieces of leg bones, mostly from elephants ...

The development of tool technology is considered a pivotal step in human evolution. Deliberately shaped stones are thought to have emerged in cultures more ancient than our own genus Homo to strip ...