“[Using] wheels to reduce friction while moving objects was one of the most important invention…”
Odis Hayden Griffin, Engineer
Most inventions do not appear out of thin air or from the ingenious brain of a brilliant scientist, but evolve from something already in existence. This is certainly true of the wheel and its attached axle, which developed from two different sources. The first was the revolving potter's wheel, invented in Mesopotamia in around 3500 B.C.E. Although not a tool essential to the potter's craft, the wheel did help in the faster production of better-quality pots. The second source was the sledge, a primitive but effective means of hauling large loads on parallel sleds or bars of wood. The sledge was ideal in icy and snowy conditions, and on hot sand, but not on hard, dry terrain, where great effort was required to pull it along.
Evidence that the use of
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