The conflict in the Sudanese province of Darfur has displaced more than two million people and cost nearly 400,000 lives. To raise international awareness, George Clooney and his father, Nick Clooney, visit the region and report their findings in this videos.

What does the Holocaust have to do with us, anyway? In part four, Roderick Miller, the chair of the nonprofit organization Tracing the Past, gives a talk at TEDxVienna about the Holocaust and contemporary Europeans' perception of the space they live in.