Analyzing the transfer of technology from one place to another can be a very difficult task. People have tried to trace the origins of specific technologies and map out what cultures it affected, why and what impact the technology had on history. Books have been written on conclusions that authors have made after doing the research I have suggested. I believe that obtaining the information to write a book about this subject is extremely hard and confusing, this is a personal assumption that I have made with regard to the fact that reading a book on this subject is hard and confusing. After reading The Tools of Empire b