Wheel and axle – Simple machines – Physics
An Egyptian potter uses a pottery wheel, about 2000 BC. He uses his hand to spin the wheel. Wheels do not exist in nature, and no animals use them except [...]
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History of Bicycles – Steel and feminism
A velocipede Early wooden bicycles Bicycles were invented bit by bit in many different countries. They grew out of earlier inventions like wheels (from Central Asia) and wheelbarrows and cranks (from China), but Karl [...]
