A wheel is a circular component that is intended to rotate on an axial bearing. The wheel is one of the main components of the wheel and axle which is one of the six simple machines. Wheels, in conjunction with axles, allow heavy objects to be moved easily facilitating movement or transportation while supporting a load, or performing labor in machines. Wheels are also used for other purposes, such as a ship's wheel, steering wheel, potter's wheel and flywheel. More: en.wikipedia.org.
Internet
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Has time always existed, or was it created at a certain point?
Do you consider iPhone to be a great invention?
Is global warming (climate change) a real threat to the environment?
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Do humans contribute to global warming?
Neil deGrasse Tyson
René Descartes
Leonardo da Vinci
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Is evolution a fact, theory, or fiction?
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Should we recognize more than two genders?