By about 40,000 years ago, humans lived in small groups. They were south of the glaciers in many parts of Asia and Europe. By about 22,000 years ago, they were moving into North America.
They made and used simple stone weapons and tools. We call them Stone Age people. Winters were very hard, but they learned how to control fire. That kept them warm and let them cook food. Their weapons were mainly stone axes and spears. They learned to track and kill large animals. They used every part of their prey, whether for food, clothing, or shelter.
