Reporters Lorenzo Franceschi-Bicchierai and Lily Hay Newman discuss our vulnerability to hacking as more and more devices become internet-connected. Actors Jeremy Secomb and Siobhain McCarthy talk about their roles in a new production of “Sweeney Todd.” Author Viet Thanh Nguyen talks about his new collection of stories exploring immigration. Dr. Jessica Nutik Zitter joins us to discuss her approach to end of life care.