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Learn how both magnetism and electricity have been used to create useful tools, and conduct experiments to see these forces in action first-hand. A True Book: Physical Science allows readers to find answers to puzzling questions as well as discover how people have used physical science to make countless innovations throughout history. This series includes an age appropriate (grades 3-5) introduction to curriculum-relevant subjects and a robust resource section that encourages independent study.Many readers will know that electricity powers lights and other devices, and that magnets can hold two objects together. But how do these important forces work, and how are electricity and magnetism related? T