The game theory was simpler during a cold war between two states armed to the teeth; the nuclear world order has since become far more complex and dangerous. Nvidia is on a tear making the artificial-intelligence community’s favoured chips. What plans, and perils, lie ahead for the firm (10:55)? And why there are ever fewer accountants on the books in America (18:25).Additional audio "As an accountant" courtesy of Rocky Paterra.Listen to what matters most, from global politics and business to science and technology—subscribe to Economist Podcasts+. For more information about how to access Economist Podcasts+, please visit our FAQs page or watch our video explaining how to link your account.Podcast transcripts are available upon request at podcasts@economist.com. We are committed to improving accessibility even further and are exploring new ways to expand our podcast-transcript offering. Hosted on Acast. See acast.com/privacy for more information.