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Crashapult STEM Challenge Mathematics Give your first-graders the funIntroduce kids to angles, trajectories, and other early physics fundamentals with the Crashapult STEM Challenge from Learning Resources. This hands on activity set challenges kids to build and complete high flying obstacle courses designed around core STEM concepts. After setting up their catapults, kids send the launch balls flying off walls, over obstacles, and toward the set's included hoop target, funnel, or goal cup. Along the way, they'll have