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Archaeologists in Kenya have dug up some of the oldest stone tools ever used by ancient humans, dating back around 2.9 million years. They say the discovery is evidence that tools were used by other branches of early humans, not just the ancestors of Homo Sapiens - or "wise man" as we've boastfully called our own species.

They would have been used to butcher hippos and pound plant materials like tubers and fruit, the researchers said.

Dr Peter Ditchfield from the University of Oxford's School of Archaeology was involved in the research and told Newshour more about the discovery.

(Photo: A sample of some the stone tools found at the site in Kenya. Credit: Reuters)