Thirty high-school students were invited to a special lecture in Mathematics at the Univeristy of Stuttgart on July 24, 2019. Prof. Michael Eisermann and Dr. Friederike Stoll talked about "Der Satz vom Diktator". This event was part of the lecture series "TryScience" and showed the work in courses and excercises at university. In additioon Dr. Stoll explained the studyprogram of the Department of Mathematics. Despite the extreme heat on that day, the students gave a very positive feedback for the event.