We go deep inside the brain to find out how it works and what happens when it doesn't. We find out why some people are empathetic while others think only of themselves; we learn how we can change the structure of our brains, and we meet a tiny creature that makes us question the notion of free will.

With Dr. Robert Hare; Professor Christian Keysers; author Donna Anderson; Dr. Dusanna Dorjee; mindfulness tutor Joann O'Malley; science writer Carl Zimmer;  professor of biology Dr. Jaroslav Flegr; Dr. E Fuller Torrey; professor Joanne Webster.