Early human ancestors may have been using tools about 800,000 years earlier than thought, according to a new study based on newfound bone evidence—prehistoric leftovers linked to the famed "Lucy" fossil's species. The discovery suggests, to at least one scientist, that tool use may extend as far back as five million years ago, to the last common ancestor of chimps and humans. Found in East Africa,
![Lucy the Butcher? Tool Use Pushed Back 800,000 Years](https://cdn-ak-scissors.b.st-hatena.com/image/square/f255f1ba3c52531212a4a3418994693e94fdc688/height=288;version=1;width=512/https%3A%2F%2Fi.natgeofe.com%2Fn%2Fa73c4a49-b9b8-4e00-8285-7f5bb1f69072%2F24502_16x9.jpg%3Fw%3D1200)