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Petralona Man Click on this icon to start or stop the narration. A human skeleton at Halkidiki's Petralona cave was discovered in 1959. This human skeleton dates back to 700,000 B.C. The man discovered was 1.5 metres tall. Many bone tools were also found inside the cave as well as traces of one of the most ancient fires ever lit by human hands on the entire planet. They also found chisels, awls, hammers and other tools. Fire was his most important friend, because it provided warmth and kept wild animals away. A recent theory suggests that we're all descended from one African "Eve" who lived some 200,000 years ago. This theory is based on DNA studies. The discovery of the Petralona man challenges this prevailing theory that the earliest "Homo" species evolved in Africa. Check that you understand what these words mean in this document Chisel: a metal tool with a sharpened edge. Awl: a pointed tool for marking surfaces or for punching small holes, knives. Theory: a general principle or set of principles that explains facts or events of the natural world. To suggest: to put forward, say. To c hallenge: to question. Prevailing theory: a theory that most people believe to be correct. Species: a category of living things of the same kind. To evolve: to change by a process of evolution.