Hello, I have been an Associate Teacher for Undergraduate Students in Physics and Chemistry for 14 years. Now, I work on my own, I write books, papers, give lectures and I feel more productive and creative that way! Physics and Chemistry Lecturer in Preparatory Classes for the Engineering Schools. Associate Professor. MSc Degree in Theoretical Physics. Phd Student in Particle Physics. ID: https://orcid.org/0000-0002-6728-8278 French: Conférencier et éditeur d'ouvrages scientifiques et scolaires. Mathieu ROUAUD. Professeur Agrégé de Sciences Physiques en classes préparatoires aux grandes écoles d'ingénieurs. Diplômé en Physique Théorique. Websites / Sites internet: www.voyagepourproxima.fr www.incertitudes.fr www.science-et-decouvertes.fr