Mary Beth Irvine, a 5th grade teacher at STARBASE 2.0, assists a visitor to the 2019 Defenders of Liberty air show with a science experiment during the air show at Barksdale Air Force Base, Louisiana, May 18, 2019. Irvine and other instructors at STARBASE helped air show attendees perform a variety of experiments as part of their station at the air show. (U.S. Air Force photo by Staff Sgt. Callie Ware)