Research: Fast, Accurate Throwing Played Key Role in Evolution

"While some of those changes occurred earlier during human evolution, Lieberman said it wasn’t until the appearance of Homo erectus, about 2 million years ago, that they all appeared together. The same period is also marked by some of the earliest signs of effective hunting, suggesting that the ability to throw an object very fast and very accurately played a critical role in the human ability to rise to the top of the food chain."