prehistory: the period of time before written records

Paleolithic Age (old stone age): during the Paleolithic period, humans 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. 

Neolithic Age (new stone age): this period, like the old stone age, people still use stone tools, wood tools and bone tools, but this period, the climate became warmer, and near the end of the period, people start agriculture. (around 10,000 B.C.), the initial transition from hunting and gathering to settled agriculture in prehistory and developing the ability to farm crops. This period is commonly referred to as the 'First Agricultural Revolution'.)

Agriculture Revolution: Also known as the Neolithic Revolution, this was a shift from itinerant hunting/gathering to more permanent settlements centered on agriculture.

Cuneiform: Cuneiform script is one of the earliest known systems of writing, distinguished by its wedge-shaped marks on clay tablets, made by means of a blunt reed for a stylus.

Ziggurat: a rectangular stepped tower, sometimes surmounted by a temple.

Indo- Europeans: the ancestral Proto-Indo-European language.