Darrell West is vice president of the Brookings Institution and director of Governance Studies at Brookings. John Allen is the president of the Brookings Institution and a retired U.S. Marine Corps four-star general. Together, they are the authors of the book, "Turning Point: Policymaking in the Era of Artificial Intelligence," a broad look at the impact that artificial intelligence systems are likely to have on everything from the military, to health care, to vehicles and transportation, and to international great power competition. They spoke with Benjamin Wittes about the book and the question of how we should govern AI systems. What makes for ethical uses of AI? What makes it scary? What are the anxieties that people have about artificial intelligence, and to what extent are the fears legitimate?