Unfortunately the sound on my computer doesn't work, so I don't know what Schuyler had to say. I would point out that known use of a tool is not proof of invention. Like the wheel, a good idea is readily copied. Also the Neo Assyrian era was less than 3000 years ago, not 4000. So what are the rough datings of found examples and the pictoral references? It sounds like there isn't a whole lot of either. Doug My computer is really slow today. Anyone else having this problem. Or maybe it is just reacting to fall it took yesterday.