News of a global study into dry age-related macular degeneration. Its aiming to help experts understand the role genetics may play in the disease. Professor Paulo Stanga from the London Vision Clinic talks us though what the study involves and how you can take part. There is a number to call if you want more information about this trial. It's 01438 532 142. The link for more details is also on our website. Also in this programme, the public transport challenges we face as we travel around the world's big cities. We'll hear from globe trotter, Mona Minkara, about her best and worst experiences. PRESENTER: Peter White. PRODUCER: Mike Young.