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Researchers say they have the likely time in history when human beings first to speak. Dr Steven Mithen, an archaeologist and expert in prehistory, that basic language was around 1.6 million years ago. This is eight times earlier than many scientists . Experts in evolution previously that spoken human language began around 200,000 years ago. Mithen said his studies that the first human language either in eastern or southern Africa. He said the ability to helped evolution. He said speech was, "without doubt, the key which much of subsequent human physical and cultural evolution possible".

Dr Mithen explains how he human speech developed so long ago in his new book , "The Language Puzzle". He says our brain quickly in size just over 1.5 million years ago. This increase the structure of our brain. An area called the frontal lobe developed. This is the part of the brain that produces language. Another important change the development of our vocal tract. This is where we sound, and therefore speech. Mithen said speech humans to around the world. It meant humans could do three important things. They could think of and future actions, and they could pass on knowledge. Mithen said language " the human story profoundly".