Psychologist Kimberley Wilson and Dr Xand van Tulleken take a journey around the human body, to find out what it can tell us about our innate capacity for change. This time, they examine the wrist, and its role as the hub where technology meets the body. Kimberley and Xand meet a man whose life was saved by his smartwatch, examine the potential pitfalls of devices that don't work for everyone equally, and learn how much data our wrists can truly give away.