Add Yahoo as a preferred source to see more of our stories on Google. Stone tools are deliberately made by the hands of hominins, like these worked on by the author. John K. Murray Have you ever found ...

Have you ever found yourself in a museum's gallery of human origins, staring at a glass case full of rocks labeled "stone tools," muttering under your breath, "How do they know it's not just any old ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) At first glance, it might seem impossible to decipher. But as an experimental ...