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An international research team led by the University of Tübingen is investigating in South Africa how our ancestors used stone materials to make tools Early hunters and gatherers from the Middle Stone Age in southern Africa selected the most suitable available stone material for tools and spearheads more than 60,000 years ago. This is what a study by Dr. Patrick Schmidt from the Department of Ancient Prehistory and Quaternary Ecology at the University of Tübingen at the Diepkloof Rock Shelter site about 150 kilometers north of Cape Town. A specially developed model was used to test the breaking strength of various rocks.