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This usage of polished stone axes increased considerably in the Neolithic, however were originally used in the preceding Mesolithic in some areas such as Ireland. Farming fed larger populations, and the shift to sedentism enabled all at once raising more kids, as babies no longer needed to be carried, as nomadic ones must.

With this boost in population and accessibility of labor came a boost in labor expertise. What activated the development from early Neolithic towns to the first cities, such as Uruk, and the first civilizations, such as Sumer, is not particularly understood; however, the emergence of progressively hierarchical social structures and specialized labor, of trade and war amongst nearby cultures, and the requirement for cumulative action to conquer ecological challenges such as irrigation, are all believed to have contributed.

The advantages of copper tools over stone, bone, and wood tools were quickly evident to early people, and native copper was probably utilized from near the start of Neolithic times (about 10 ka). Native copper does not naturally take place in large quantities, however copper ores are rather common and some of them produce metal easily when burned in wood or charcoal fires.

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The very first uses of iron alloys such as steel dates to around 1800 BCE. Energy and transport The wheel was invented circa 4000 BCE. Meanwhile, human beings were discovering to harness other kinds of energy. The earliest recognized usage of wind power is the sailing ship; the earliest record of a ship under sail is that of a Nile boat dating to the 8th-millennium BCE.

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The ancient Sumerians in Mesopotamia used a complicated system of canals and levees to divert water from the Tigris and Euphrates rivers for watering. According to archaeologists, the wheel was created around 4000 BCE probably separately and almost all at once in Mesopotamia (in present-day Iraq), the Northern Caucasus (Maykop culture) and Central Europe.

The oldest artifacts with illustrations depicting wheeled carts date from about 3500 BCE; however, the wheel may have remained in usage for centuries before these illustrations were made. More recently, the oldest-known wooden wheel worldwide was found in the Ljubljana marshes of Slovenia. The invention of the wheel changed trade and war.