190223-N-VH385-0012 KEYPORT, Wash. (Feb. 23, 2019) Participants practice using 3D printing pens during the 21st annual Discover "E" Day at Naval Undersea Museum Keyport. Discover "E" Day is a national event designed to engage the young people of our nation in science, technology, engineering, and mathematics (STEM) learning and inspire them to pursue future careers in those fields. (U.S. Navy photo by Mass Communication Specialist 2nd Class Wyatt Anthony/Released)