⭐ Get a Full Year of Elementary STEM Challenges with this bundle of 36 hands-on science activities for Grades 3-5. These NGSS-aligned labs are printable, digital, and fully editable—perfect for Physical Science and Engineering units | Updated for 2026 This full-year STEM bundle includes 36 hands-on STEM challenges & activities designed for grades 3, 4, and 5. Each activity gives students structured opportunities to build, test, observe, and explain what happened using simple materials