Spontaneous, short talks. There is no prepared Agenda, just come to the stage! If you wanna held a talk, approx 5-10 minutes, just come to the venue. There is no planned schedule, the talk slots are organized ad hoc. If you are holding a talk: Please note that the Lightningtalks are streamed and recorded, and published as CC-BY 4.0 License. about this event: https://cfp.gulas.ch/gpn21/talk/Z99UUE/