Katriona is a doctor with a PhD in psychology, but she has had to face some incredible obstacles to get where she is today. She told us about growing up in poverty and with parents who were addicts, having a child at 15, and ending up homeless, suffering with her own addiction - and then how she turned it all around. We talk about how teachers can have an incredible, transformative impact on the life of a kid who's struggling - or they an do the opposite. Katriona is a powerhouse and her story is inspirational. She is the author of a new book, telling her owns tory, called 'Poor'.