Wheel, or wheel-and-axle, is one of the ingenious human invention. Most primitive technologies were inspired by the natural world, but the wheel is one hundred percent the product of homo sapiens’ mind. Nowadays, wheels are so prevalent that many modern technologies, from simple to complicated, are unimaginable without wheels. Wheels are very important because it enables mankind to work more efficiently and effectively. Its circular shape becomes the important component of almost every mechanical device, that it is almost impossible to imagine some other shapes than wheels.
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