Stage two pupils had the role of a teacher. They talked to the peers about the famous Serbian scientists. They prepared a presentation, lecture and materials in order to present the work of these great men. They talked about Nikola Tesla, Milutin Milankovic, Josif Pancic, Jovan Cvijic, Mihajlo Pupin. As the lecture was very successful the first graders presented the lecture to their older friends from fourth grade.