This text is a compilation of step-by-step instructions for how to build nine different types of catapults and trebuchets. Each set of instructions includes dim
Let children experience the learning power of play! Let’s Play is a handbook full of child-led, open-ended learning adventures. The 39 fresh, fun, and budget-
Calling all pumpkin chuckers, wannabe marauders, and tinkerers of all ages! Flinging things and playing at defending your own castle has never been more fun. Wh
Engineering is where human knowledge meets real-world problems—and solves them. It's the source of some of our greatest inventions, from the catapult to the j