The Catapults STEM Boost Kit is a hands-on engineering kit for one middle-level student. Learners build and test a catapult to explore how medieval machines used force and motion to launch projectiles, guided by bilingual student guides (English and Spanish). Students construct a working catapult, experiment with launch angles and design variables, and apply the engineering design process to improve accuracy and distance. All supplies are included—no additional materials or technology required. Works in classrooms, makerspaces, afterschool programs, camps, and home learning environments.