Early Human Lessons: Hot Rocks Make Sharper Tools

Early humans may have used cooking methods to transform silcrete (left) into sharp tools (right).  And the ability to heat and carve rocks into tools shows they were thinking in complex and symbolic ways.
Early humans may have used cooking methods to transform silcrete (left) into sharp tools (right). And the ability to heat and carve rocks into tools shows they were thinking in complex and symbolic ways.