The 13th EspAciais teachers’ conference, run by ESERO Portugal (Ciência Viva and ESA), takes place on 9–10 October at the Pavilhão do Conhecimento in Lisbon under the theme “Space for Sustainable Cities”. Day one brings talks by scientists and engineers, including ESA’s James Carpenter, day two hands-on classroom activities. Registration is closed, but places may reopen. Our take: inspiring teachers is the cheapest way to multiply space careers.