Social Psychologist Sander van der Linden is known around the University of Cambridge as the “defense against the dark arts teacher.” He shows how we can inoculate ourselves against misinformation in his new book, "Foolproof: Why Misinformation infects our Minds and How to Build Immunity."Then biologist Dr. Danielle Clode. She studies koalas and writes about this marsupial (which is actually not a bear!) that eats only one food, one that is toxic!