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Wheel and axle – Simple machines – Physics

By |2019-04-26T07:02:19-07:00August 17th, 2017|Central Asia, 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 people (though some animals do use gears, which are a special kind of wheel). People didn't use wheels until the Neolithic, about 10,000 [...]

History of Bicycles – Steel and feminism

By |2019-02-13T20:34:07-07:00August 7th, 2017|Modern Europe, Science|

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 von Drais, a German inventor, built the first riding machine with two wheels, one in front of the other, that you had to balance on, [...]