Our Ancestors Crafted Hand Axes From Cold Lava, Tool Factory Unearthed in Ethiopia Depicts Their Advancement Human ancestry was marked by the evolution of intelligence used for survival and livelihood ...

That black rock was a 4.6-pound chunk of obsidian ... Pre-contact people reshaped or flint-knapped obsidian to make tools like arrowheads. “If it does happen to be authentic, we will be able ...