Personal introductionEach PhD research is a project that develops over several years and not only reflects scientific insights but is also a personal journey of the researcher. As with every journey in my life, in the beginning, there was not much more than a rough plan, a big amount of curiosity, and the hope -or actually the deep belief -that on the way, I would meet people who would inspire me and help me when necessary. In the following, I will explain why and how I connect my personal and my scientific evolution.My research is about quantum physics (QP) and the Nature of Science (NOS), how these two constructs are intertwined, and how this connection can be fruitful for teaching and learning physics in high schools. My fascination for QP has a long history. I had a great physics teacher at school (Figure 0-1) who was enthusiastic about QP, and that was indeed the reason why I decided to study physics at the University of Münster in 1985. NOS, on the other hand, was an unknown term for me until 2016, when I started my PhD research. I had been unaware that the term NOS existed and that, over the years, a whole area of educational research about NOS teaching had developed. I was not unaware of what the term stands for: the way science works as a human enterprise. Figure 0-1 My high school physics class, with teacher Camen, at the Theodor-Heuss-Gymnasium in Hagen, 1985. Notice the Schrödinger equation on the blackboard 4 Translated: