In this paper, we intend to present the project Histórias com Ciência na Biblioteca Escolar [(Hi)stories with Science in the School Library], a project which brings History of Science topics to high schools in the city of Aveiro (Portugal). This project is a joint project of the University of Aveiro and the Rede de Bibliotecas Escolares [School Libraries Network, a program of the Ministry of Education]. The goal of this project is to join the University and High Schools in promoting scientific dissemination, namely the research carried out in the University, as well as extending the scientific culture to a pre-university audience. This project is coordinated by Professor António Andrade (Department of Languages and Cultures) and consists of a cycle of nine conferences in high school libraries by several investigators of the University. The themes of these conferences are very diverse and include areas such as astronomy, medicine, botany, literature, physics and mathematics. These conferences are always centered on episodes of the history of science, for instance, botany in the work of the epic Portuguese poet Camões, the importance of amateur astronomers in the past, the history of syphilis, the importance of the phonograph in Portugal, among others. In this paper, we will present the three mathematical conferences in detail.