A little girl born with her heart outside her ribcage, a man who can hold his breath for nine minutes and a woman growing a second skeleton are just some of the unique individuals profiled in this six-part series looking at the mysteries of the human body.

Dr Gabriel Weston investigates incredibly rare conditions such as these, and asks leading scientists what these exceptional people can teach us about the body. Dr Weston is an engaging guide in the first of six fascinating helpings of popular science.