Ash was discovered in a South African cave, and this indicates that humans were cooking with fire one million years ago. This is the earliest use of fire but experts say that more proof is needed to conclude that humans were cooking with fire regularly. Francesco Berna, an archaeologist, at Boston University in Massachusetts, and his team found ash that was composed of burnt grass, leaves, brush, and bone fragments in sediments 30 meters deep inside Wonderwerk Cave, in Northern Cape, South Africa. This cave is one of the oldest known sites of human habitation and shows traces of having...