This week. we’re looking at what science has to say about the origins of selfless – and even self-sacrificing – behavior. We’ll speak to biology professor Lee Alan Dugatkin, about his book The Altruism Equation: Seven Scientists Search for the Origins of Goodness. And we’ll discuss altruism from a neurological perspective, with Duke University Neuroscientist Steve Chang, whose research in monkeys looks at how their brains process and record helpful inclinations.