To learn about people from long ago, archaeologists analyze and study the things that those people left behind, hoping to find clues that will tell us about how those people lived. Sometimes those early people left clues about their lives scratched or painted on rock. Sometimes they left behind the black soot of their campfires on the ceiling of a rock overhang or in a cave. Sometimes those people left behind things that they used or made from natural materials to make their lives easier. These articles are called artifacts and much of the science of archaeology centers around finding, collecting, analyzing and preserving these artifacts that early people left behind.