As part of the 2018 York Festival of Ideas, members of the Genever Lab at the University of York had great fun at the Family Fun Afternoon. They showed off their new childrens’ public engagement activity, “Stem Cell Superheroes”. The aim of the game was to sort stem cells out from other cells and use those to help superheroes heal their joints (by firing nerf guns at them!). The event was hugely successful, with many repeat visits. We were delighted to interact with the community and share our research.