article_snippet: Scientists have found that the skeletons of early species of human changed to give Scientists the ability to throw much like modern humans.
article_snippet: The researchers compared The researchers throwing ability to the dimensions of The researchers collarbones and the humerous bone.
article_snippet: The world record for throwing the javelin, for example, is 321ft (98 metres) for men.
article_snippet: The study showed that differences in collar bone size did not alter the length or speed of the throw.
article_snippet: The ability to throw powerfully and accurately has long been thought of as being a uniquely human trait.
article_snippet: Chimpanzees, by comparison can only throw at speeds of around 20mph.
article_snippet: The study builds on earlier work by Dr Roach that compared the throwing action of college baseball players with the skeletons of chimpanzees.
article_snippet: the skeletons of chimpanzees identified key change to the shoulder, arm and torso of humans that allowed the skeletons of chimpanzees to store elastic energy in the skeletons of chimpanzees ligaments and tendons to help power a throw forward with great accuracy.
article_snippet: Dr Roach said: 'A number of changes occurred in our evolutionary past to the shoulder, arm and torso make this elastic energy storage possible. 'the shoulder, arm and torso first occurred two million years ago in the species Homo erectus.
article_snippet: That allowed our to throw with incredible velocity at around that time. '