STEM Snowball Frenzy: An Engineering Exploration of Levers and ForceSTEM and Snow? Engineering an indoor snowball launcher??? You bet!! Using marshmallows and information about levers, force, and gravity, your students will engineer an exciting winter event without having to deal with cold hands and frozen toes. Packet includes a teachers guide, student EDP guide, background information about levers and catapults, reflections sheets rubric, inquiry questions, group task cards, background inform