Bisexuality is the largest sexual minority in the world – but according to psychologist Dr Julia Shaw, it’s the least well understood. She talks to Madeleine Finlay about her new book, Bi, which challenges us to think more deeply about who we are and how we love. She discusses the history of trying to define and measure bisexuality, sexual behaviour in the animal kingdom, and how we can improve health outcomes for bi people.. Help support our independent journalism at https://www.theguardian.com/sciencepod">theguardian.com/sciencepod