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.
Ancient history
The Ancient Near East is considered the cradle of civilization. It was the first to practice intensive year-round agriculture; created the first coherent writing system, invented the potter's wheel and then the vehicular- and mill wheel, created the first centralized governments, law codes and empires, as well as introducing social stratification, slavery and organized warfare, and it laid the foundation for the fields of astronomy and mathematics.