The University of Vienna has launched a carbon-neutral film festival that is powered by three bicycles. Scientists, students and visitors must pedal together to keep the show running, combining engineering as well as a bit of climate awareness.The free festival, which lasts until 19 June, will feature eight films aimed at children, trying to get them interested in science. Screening locations will change every week. People are encouraged to bring a blanket and enjoy the outdoors with a picnic and their kids. The Cycle Cinema Club, a local group which does similar pedal-powered events and has the technical know-how on what they require, helped the university design the event.