Sarah Brown talks to Raed al Saleh of the White Helmets in Syria, nurse Pauline Cafferky, Brendan Cox and Ousmane Ba.  There are many people around the world challenged to take daily acts of heroism to rescue, support or even save their fellow humans. This episode focuses on the people who risk their life for change. When the bombs rain down, the Syrian Civil Defence rushes in. When Ebola strikes, nurses volunteer from around the world. When schools are destroyed in a war, a young person steps up to rebuild them. What determines their actions? What makes them tick?