Early modern humans were engineers

According to new research, Scientists from Arizona State University has found that about 72,000 years ago in South Africa humans were using "heat treatment" to improve their stone tools. Researchers said this heat treatment technique could be a gap between the use of fire to cook food 800,000 years ago and the production of ceramics 10,000 years ago. Researchers found this evidence at the pinnacle, a Middle Stone Age site on the South African coast. All these details have been published by the researchers in the journal Science. The lead researcher from the Arizona State University Kyle Brown said that the people who were living before 72,000 years ago were using fires for cooking, heat, light or protection and people about 10,000 years ago were using fire to make ceramics and to extract iron and copper from their ores. He also mentioned that these heating stones would be the dawn of human engineering.