Was a skillful, learned scholar in the law of moses.

ezra
nehemiah
aaron

Ezra was a skillful, learned scholar in the Law of Moses. There was a period in the Bible when Nehemiah asked Ezra to read the Law of Moses to the crowd. After which people and priests have entered into a covenant that they will keep the Law of Moses and separate themselves from those people who have not heard of such Law. 

During the paleolithic, hominins grouped together in small societies such as bands, and subsisted by gathering  plants  and fishing, hunting or scavenging wild  animals. the paleolithic is characterized by the use of knapped stone tools, although at the time humans also used  wood  and bone tools.

It allowed for things to be produced much more quickly and efficiently