They wear capes and can fly. In a parody of the classic comic book, stem cells have become today's superheroes -- as portrayed in an engaging short video created by the Ontario Science Centre to promote its current stem cell exhibition. Quirky, but scientifically accurate, the video gives children and youth a quick summary of stem cells and how they function in the body. The intent is to stimulate questions and to drive kids into the main exhibit in search of answers.