This talk was given at a local TEDx event, produced independently of the TED Conferences. Lifesaver is an idea for a better way to teach emergency skills like CPR, using interactive film. It's a free, award-winning site and app, available now from www.life-saver.org.uk. Martin Percy, its writer/director, tells the story of Lifesaver - and shows how to use its approach to tell life-saving stories of your own.