A major challenge for us, scientists, is to communicate complex concepts and detailed content in ways that are appropriate for the wide audience. In the filmmaking marathon, we seek to challenge, inspire and train researchers to use filmmaking to communicate their research. Scientists learn how to make films by working with filmmakers in four intensive days, aiming to produce short films in small groups. A selection of the produced films will be screened at the 2nd Global Science Film Festival www.sciencefilm.ch.