Nenad Vukmirovic has been a professor at the Institute of Physics Belgrade, Serbia, since 2010. His research interests are in theory and simulation of electronic properties of semiconductor materials and nanostructures. He is also very active in work with talented high school students. Nenad has been the author of many problems at high school physics competitions since 2012, including the problems at the final stage of the competitions such as the Serbian Physics Olympiad. Vladimir Veljic received his PhD in physics in 2019 at the University of Belgrade, following which working with high school students revealed his passion for physics education. Vladimir has been the author of theoretical problems for several levels of competitions and has been a part of several national- and international-level Olympiads.