Quick & Easy STEM Activities for Busy ClassroomsLooking for no-prep STEM activities that are perfect for centers, sub plans, early finishers, or bell ringers? STEM Improv offers engaging, 10–15 minute challenges that spark creativity, build mental flexibility, and focus on the planning phase of the Engineering Design Process (EDP). This resource is packed with hundreds of design possibilities that will keep your students thinking critically and solving problems—all without the need for mater