Op-Ed: Phoney organ maketh a man

July 30, 2007

Human are tool-using animals and have been for some time. Current estimates have our ancestors making simple stone tools about 2.5 million years ago. Back then, our forebears would have looked rather different to modern humans. Standing about 130 centimetres, they had a smaller skull (and a smaller brain) and were covered in fur. One key similarity is that they stood on two feet. In evolutionary terms, this is very important as it left the hands free to make and use tools. (The Age)