Similarly, the early peoples of Mesopotamia, the Sumerians, realized to make use of the Tigris and Euphrates rivers for a lot the same functions. But more extensive use of wind and water (and even human) energy required one other invention. Continuing enhancements led to the furnace and bellows and offered the flexibility to smelt and forge native metals (naturally occurring in comparatively pure kind). The advantages of copper instruments over stone, bone, and wooden tools have been rapidly obvious to early people, and native copper was most likely used from near the beginning of Neolithic times (about 8000 B.C.E.).
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