具体描述
Thirteen experiments about the six simple machines -- the lever, wheel and axle, pulley, inclined plane, wedge and screw -- teach kids about basic science. Full-color photographs and step-by-step instructions clearly explain each activity, so that kids can make the most of the machines with minimal help from adults.Part of the Starting with Science series, "Simple Machines" encourages children to have fun as they learn basic science and fills a need for primary-level science resources.
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