 Empathy is the understanding that someone else's world is just as real as yours. When Nafis Hamid began studying terrorists, he was worried they wouldn't want to take part in his research. He was wrong. Even when I got to the most extreme people, they became curious. They wanted to know more about, well, what does previous neuroscience say? Like, what are your hypotheses about this? The science of extremism and how to mitigate it. First, this news.