The most complicated machines often rely on a few very simple principles of technology -- wheels, springs, screws, wedges, and the like. Simple Machines explores these technologies by relating them to common machines in our everyday world -- from bedsprings to skateboards to zippers. The clear text is punctuated with colorful photos and illustrations as well as numerous Fact Files, which offer primary readers fast facts and other pertinent information.
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| Glossary |
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| Index |
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