Thanks again. Can (and have) linguists tools been used to date some early technical progress like the invention of the wheel and asign proper credit to some group? For an older example: where and when was the bow and arrow invented or is that too far back in the past. How about some form of indoor toilet?* etc. What can you linguist tell us about man's progress or have the archologist done it all? If they have does their work only help the lingiusts? (or is it a "two way street" - both helping the other to understand better man's history?) ------------------- * Probably just myth, but I have idea the flush verions was invented by Mr.Crapper.