The Rape of Nanjing episode is particularly interesting since he goes over the book "The Rape of Nanking: The Forgotten Holocaust of World War II" by Iris Chang in the first part, following that up with readings from "The Woman Who Could Not Forget" by, Dr. Ying Ying Chang which goes over how researching the Nanjing Massacre affected her daughter Iris deeply enough to the point of ending her own life.
Usually this is stuff that people avoid, but I feel that knowing what people are capable of doing gives some perspective in my life.