"Wow, our plastic load flew 540 centimeters! This is so cool!" An interdisciplinary unit on catapults was responsible for the excitement and enthusiasm generated in the author’s classroom. In their social studies class, students learned about the Middle Ages (500–1500 A.D) throughout Western Europe and the Eastern and Middle Eastern countries. In their math class, students learned about data collection, graphing, statistics, and metric units. In the science classroom, students focused on controlling variables while testing and modifying classroom catapults, which were popular weapons in the Medieval Ages.