"How does a car move from one place to another? How do cranes lift such heavy objects? From ancient times to now, engines have powered people's lives. Engines! With 25 Science Projects for Kids invites readers ages 7 to 10 to explore engines and deepen their understanding of the history of engines, what makes them hum, and all the special jobs they do for humans. Engines! also examines some of the ways mechanical innovation has backfired, such as how the cotton gin extended the history of slavery in eighteenth-century America. Explore the world of engines through 25 hands-on, science-minded projects. Fascinating facts, essential questions, links to online resources, and even jokes help support deeper learning!"--Page 4 of cover.