Ch. 12 - Blueprints and Borrowed Letters: KNOW Writings initial use was used by Kings and Preists of ancient Sumer to record the number of sheep owed in taxes. Writing was only used for the higher authority figures initially, personal use of wiring by non-professionals came only much later, as writing systems grew simpler and more expressive.
> Most likely all or most of the independent inventions of wiring and those systems came from socially stratified societies with complex and centralized political organization.
> As we saw in chapter 10, the north-south axes and ecological barriers within Africa and the Americas retarded the diffusion of crops and domestic animals. The history of writing illustrates strikingly the similar way in which geography and ecology influenced the spread of human inventions.