Best-selling author and historian Niall Ferguson has a knack for taking the long view of events shaping our world. His new book argues that networks like Facebook are nothing new and have always been a force for change. He joins Libby to talk about it Plus � Today is World Cancer Day, and the focus is on survivors. There are more and more every year, but also an increasing number of people who suffer lasting side effects � including one that is just being recognized: PTSD. Libby speaks with Dr. Gary Rodin of the Princess Margaret Cancer Centre.