Humans were making spears half a million years ago

Well, it wasn't humans exactly. Probably our Homo heidelbergensis ancestors lashed the first sharpened rock to a large wooden pole. It looks like yet another technological milestone has been pushed back even further into the past, as new research suggests that early humans were making hafted spears and knives an… » 11/16/12 9:40am 11/16/12 9:40am