Simple Machines - Learning About Them - Children's Science Book - Kids, Bold
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Throughout history, humans have developed simple machines. These are mechanical devices that allow us to perform tasks that would otherwise be impossible. These devices work by changing the direction and intensity of the force that is applied. They can be very useful.

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Throughout history, humans have developed simple machines. These are mechanical devices that allow us to perform tasks that would otherwise be impossible. These devices work by changing the direction and intensity of the force that is applied. They can be very useful.