Invisible History of the Human Race

We are doomed to repeat history if we fail to learn from it, but how are we affected by the forces that are invisible to us?What role does Neanderthal DNA play in our genetic makeup? How did the theory of eugenics embraced by Nazi Germany first develop? How is trust passed down in Africa, and silence inherited in Tasmania? How are private companies like Ancestry.com uncovering, preserving and pote...