In this talk, I will present the key findings on first impressions and stereotypes offered by cognitive science. By presenting the main experimental designs that are used to product these results, I will question the limits and issues of this research and discuss how we can ensure a safe use of these results Lou Safra holds a PhD in cognitive science awarded by the Ecole Normale Supérieure, Paris in 2017. She is currently assistant professor in political psychology at CEVIPOF-Sciences Po and an associate researcher at the Institut d’Études Cognitives (Laboratoire de Neurosciences Cognitives & Laboratoire de Neurosciences Cognitives et Computationelles, École Normale Supérieure, Paris). The music used in this episode is by Thula Borah and is used with permission.