Claudia Hammond finds out why films are being made of residents of a care home in South West London. They all have dementia and the story of their lives is told through photos, interviews and music and their beneficial effects are being studied in a small NHS trial. Claudia meets 92 year old May and her daughter, Valerie to find out what the film has done for her and why this kind of reminiscence therapy is so effective. Claudia talks to psychologist John Bargh about the power of the unconscious mind, why sad music makes people spend more and how we can use our unconscious mind's susceptibility to our own advantage. And why a community organisation in Tyne and Wear called Citizens UK has brought together people from schools, mosques, churches, politicians and the NHS to ask what their top priority should be. Find out why they all voted for mental health and what they're going to do about it. Psychologist Dr Catherine Loveday of the University of Westminster also explains why just believing that you do less exercise than your friends is likely to make you die earlier even if it's not true and a she discusses a recent study investigating the therapists' habits that most annoy their clients.