In this project, the aim was to convince a group of 50 people by groups of three about a topic of choice: in this case the existence of a multiverse. We had one week to find our arguments, structure them to turn them into a 15 min presentation to which the result would be a convinced public. Throughout the week we get several "coachings" during which we learn various techniques used in the art of persuasion. Adapting a good posture, volume, making use of the "ethos", the "pathos" and the "logos" in order to convince and touch the public through every aspect.