1. The document provides an overview of prehistory, beginning with the earliest humans over 2.5 million years ago and ending around 3,500 BC with the invention of writing.
2. Prehistory is divided into the Stone Age (lower, middle, upper Paleolithic and Neolithic periods) and the Metal Ages (Copper, Bronze and Iron Ages).
3. During the Neolithic period, around 9,000-7,000 years ago, humans transitioned from nomadic hunter-gatherers to settled farmers and villagers with the development of agriculture and livestock domestication.