WHAT IS PREHISTORY? Prehistory is the period from when the first humans existed about two million years ago, until the invention of writing. Although people living this period couldn’t write, they could leave some historical sources. These historical sources mean that we can learn about prehistory. There were two main periods of prehistory: PALEOLITHIC PERIOD and the NEOLITHIC PERIOD. In the Paleolithic period, people were NOMADS. This means that they moved from place to place to look for food and shelter. They used stone, wood and bones to make SIMPLE TOOLS. In the Neolithic period, people started to live in one place and form COMMUNITIES. They started to grow CROPS and keep DOMESTIC ANIMALS. They used stone and metal to make more COMPLEX TOOLS.