Laetoli even reveals footprints of humans from 3.6 million years ago.

Some sites also contain evidence of the earliest use of simple tools.

Archeology is the scientific study of past human culture and behavior, from the origins of humans to the present.

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These remains include the fossils (preserved bones) of humans, food remains, the ruins of buildings, and human artifactsitems such as tools, pottery, and jewelry.

From their studies, archaeologists attempt to reconstruct past ways of life.

For the most part, the only things that survive are durable items such as potsherds (small fragments of pottery), tools or buildings of stone, bones, and teeth (which survive because they are covered with hard enamel).

Because many items disintegrate over time, archaeologists get an incomplete view of the past that they must fill in with other kinds of information and educated reasoning.

Today, archaeologists study the great cultural diversity of humanity in every corner of the world.

Archaeological study covers an extremely long span of time and a great variety of subjects.

Archaeologists have documented that the development of agriculture took place about 10,000 years ago.

Early domesticationthe planting and harvesting of plants and the breeding and herding of animalsis evident in such places as the ancient settlement of Jericho in Jordan and in Tehuacn Valley in Mexico.

With its focus on the ancient past, archaeology somewhat resembles paleontologythe study of fossils of long-extinct animals, such as dinosaurs.