Early toolmakers were 'engineers'

Early modern humans in South Africa were using "heat treatment" to improve their stone tools about 72,000 years ago, according to new research.

This technique may bridge a gap between the use of fire to cook food 800,000 years ago and the production of ceramics 10,000 years ago.

Evidence for this innovation was found at Pinnacle Point, a Middle Stone Age site on the South African coast.

Read the rest of this article...