Archaeology
Uruk (Erech in the Old Testament and Warka to Arabs), perhaps the first great city, is founded in Mesopotamia (Iraq) on the banks of the Euphrates River. See also 3500 bce Archaeology. (See essay.)
CommunicationPeople in the Near East begin to use seals to identify property by stamping the seal into wet clay. See also 3000 bce Communication.
Food & agricultureOlives are cultivated in Crete.
Rice is cultivated in Indochina (Thailand), probably having spread from a center in the Yangtze Delta. See also 5000 bce Food & agriculture; 2000 bce Food & agriculture.
The ard, a primitive form of plow, is in use in China. Plows pulled by cattle are known in northern Mesopotamia. See also 6000 bce Food & agriculture.
Maize, called corn in the United States, is domesticated in what is now the Tehuacán valley or nearby Oaxaca, Mexico. See also 7000 bce Food & agriculture.
MaterialsThe Egyptians and Sumerians smelt silver (make the metal from an ore). See also 4200 bce Materials.
A standard kiln is developed in Mesopotamia. The fire is in a hearth below a perforated separation from the kiln chamber where the pottery is held while it is being fired. See also 7000 bce Materials.
Iron beads are used in what is now Cairo, Egypt, as evidenced by oxidized remains of a string of them. This is the earliest direct proof of human use of iron. See also 3500 bce Materials.
MathematicsThe simple tokens that have been used for keeping numerical records since about 8000 bce are first supplemented by complex tokens that have marks on them or that are in new and varied shapes (the earlier, unmarked tokens were almost all simple geometric shapes or representations of jars or animals). See also 8000 bce Mathematics; 3700 bce Mathematics.
A system of numeration begins to be used in Egypt. (See essay.)
TransportationEgyptians build boats made from planks joined together. Previously, boats were dugout canoes and possibly rafts of reeds bound together or skins stretched over a framework. See also 4300 bce Transportation.
Horses are being ridden in what is now Ukraine. See also 5000 bce Food & agriculture.
| Millennia: | 5th millennium BC · 4th millennium BC · 3rd millennium BC |
| Centuries: | 40th century BC · 39th century BC · 38th century BC · 37th century BC · 36th century BC · 35th century BC · 34th century BC · 33rd century BC · 32nd century BC · 31st century BC |
The 4th millennium BC saw major changes in human culture. It marked the beginning of the Bronze Age and of writing.
The city states of Sumer and the kingdom of Egypt were established and grew to prominence. Agriculture spread widely across Eurasia. World population in the course of the millennium doubled, approximately from 7 to 14 million people in the area surrounding them.
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| Holocene Epoch |
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| ↑ Pleistocene |
| Holocene/Anthropocene |
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Based on studies by glaciologist Lonnie Thompson, professor at Ohio State University and researcher with the Byrd Polar Research Center, a number of indicators shows there was a global change in climate 5,200 years ago, probably due to a drop in solar energy output as hypothesized by Ohio State University.[1]
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