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The wheel stands out as an original engineering marvel, and one of the most famous inventions. This basic technology not only made it easier to travel, but also served as the base for a huge number of other innovative technologies. Yet, the wheel is not actually that old. The oldest known wheel is from Mesopotamia, around 3500 B. C. By that time, humans were already casting metal alloys, constructing canals and sailboats, and even designing complex musical instruments such as harps.

In fact, the main invention was not the wheel itself, which was likely invented the first time someone saw a rock rolling along, but the combination of a wheel and a fixed axle, which allows the wheel to be connected to a stable platform. Without the fixed axel, the wheel has only very limited utility.

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