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Nuts and Bolts
99% Invisible
The Evolution of the Wheel
The Yamnaya cart, the example that was found in this grave was a solid set of wheels. They were made from three planks of wood that were sort of dowled or pegged together. And these would get dragged along by animals. So when our carpentry skills improved and we were able to use harder metals to create our tools, we then created spoke to wheels.
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