Capt. Walter Darnell, U.S. Air Force Academy, and Capt. Malgorzata Darnell, Air Force Space Command, assist their daughter with a test flight of her balsa wood glider that she assembled at STEM Rocks! The festival was held at the Peterson Air and Space Museum Aug. 24, 2013, and included hands-on activities for kindergarten to eighth graders. Some of the activities involved making slime, crawling through caves, launching rockets, building gliders, electricity demonstrations, and more interactive demonstrations. (U.S. Air Force photo/Craig Denton)