How to explain dark matter and black holes to high school students? Since 2017, the “Física de fronteira para a sala de aula” (“Frontier Physics for the Classroom”) course has sought to enable teachers to teach students advanced theoretical physics topics through creative methods and practical activities. The materials are offered by the Perimeter Institute for Theoretical Physics, in Canada, and the training is promoted by the South American Institute for Fundamental Research (ICTP-SAIFR), with support from Serrapilheira.