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What can make a ball roll faster? Does the temperature of wood affect the heat of a fire? How can old-fashioned tin can telephones teach today s students about sound and technology? By presenting everyday mysteries like these, this book will motivate your students to carry out hands-on science investigations and actually care about the results. The 21 open-ended mysteries focus exclusively on physical science, including motion, friction, temperature, forces, and sound. The stories come with lists of science concepts to explore, grade-appropriate strategies for using them, and explanations of how the lessons align with national standards. They also relieve you of the tiring work of designing inquiry lessons from scratch.