Ordinarily, if a child tells you he’s going off to create a rocket, you’re concerned. Backyard Ballistics: Build Potato Cannons, Paper Match Rockets, Cincinnati Fire Kites, Tennis Ball Mortars, and More Dynamite Device offers clear instructions on building such devices. Using household items and easy to procure hardware store materials, kids can build projects ranging from a match-powered rocket to a tennis ball cannon. With a strong emphasis on safety, the book also gives tips on troubleshooting, explains the physics behind the projects, and profiles scientists and experimenters. Perfect for would-be engineers and inventors, it encourages an interest in science, invention and thinking outside the box. Oh, and the explosive aspect helps too.