Archaeology
The city of Uruk (Iraq), ruling over 76 outlying villages, is based in an urban area that extends over 400 hectares (1000 acres), surrounded by a 10 km (6 mi) wall. Its population has grown to nearly 50,000. See also 2800 bce Archaeology; 2335 bce Archaeology.
CommunicationContracts are being used in Sumer.
Food & agricultureCulture of silkworms is started in China. According to legend, Se Ling-she the wife of Emperor Huang-ti, is the first to unroll a cocoon and make silk. See also 53 bce Materials.
Medicine & healthAcupuncture is practiced in China.
TransportationBowls found in Minoan ruins on Crete that date from this time appear to have been made in Egypt, suggesting seagoing trade between the two. It is thought that the Minoan ships traded all over the Mediterranean by this period. See also 3000 bce Transportation; 2600 bce Transportation.




