The author brings together Newton and the three great physicists of the 20th century in an imaginary meeting. His "alter ego" Adrian Haller moderates the discussions. By means of questions and answers the whole cosmos of quantum physics is described in a simple way, easily understandable by non-physicists. The beginnings of quantum theory and atomic physics as well as the importance of quantum physics for our daily life -- these and many more topics are the subjects of the interesting and fascinating discussions.