Asia
The coastal periphery was home to some of the world's earliest known civilizations, each of them developing around fertile river valleys. The civilizations in Mesopotamia, the Indus Valley and the Yellow River shared many similarities. These civilizations may well have exchanged technologies and ideas such as mathematics and the wheel. Other innovations, such as writing, seem to have been developed individually in each area. Cities, states and empires developed in these lowlands.
Nuragic civilization
In the Stone Age the island was first inhabited by people who had arrived there in the Paleolithic and Neolithic ages from Europe and the Mediterranean area. The most ancient settlements have been discovered both in central and northern Sardinia (Anglona). Several later cultures developed on the island, such as the Ozieri culture (3200−2700 BC). The economy was based on agriculture, animal husbandry, fishing, and trading with the mainland. With the diffusion of metallurgy, silver and copper objects and weapons also appeared on the island.