Design, arrange, construct, and experiment with Cool Engineering Projects! Kids can learn how to build a colorful working catapult, assemble a simple-machine maze, and more! Each workshop project includes easy-to-read, step-by-step instructions paired with photographs. Budding craftspeople and engineers will love learning how to use the tools of the trade to make one-of-a-kind creations. Aligned to Common Core Standards and correlated to state standards. Checkerboard Library is an imprint of Abdo Publishing, a division of ABDO.