52 NGSS-aligned STEM challenge activities to build engagement, critical thinking, & problem-solving all year long! These are easy STEM activities to implement, use simple materials, and include modifications for grades 2 - 8. The basic idea: Students work in partners or groups against criteria & constraints lists and use a combination of science, engineering, math, and technology skills to design and build solutions to problems. Every challenge includes a video walk-through to help teac