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Machines are useful because they can automate tasks, increase efficiency, and improve productivity. They can perform repetitive or labor-intensive tasks with speed and precision, allowing humans to focus on more complex or creative work. Additionally, machines can often perform tasks that are difficult or dangerous for humans, enhancing safety in various industries.
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The invention of the washing machine is important because you couldn't wash your clothes quickly and properly without it.
a windmill
Simple machines are any device used to change the direction and or magnitude of a force. Levers, pulleys, wheels, and the inclined plane are all examples of simple machines.