Today's episode is all about tech. First, Paul Scharre of the Center for a New American Security speaks with NPR's Ari Shapiro about his new book, Four Battlegrounds: Power in the Age of Artificial Intelligence, and the ways autocratic governments can rely on AI for repressive surveillance tactics. Then, Duke University professor Nita Farahany and NPR's Ailsa Chang discuss a potential nightmare: employers' ability to track worker's brains for productivity. Farahany's new book, The Battle for Your Brain, tracks advancements in neurotechnology and advocates for cognitive liberty.