The bomb (part 4): the stewards of America's nuclear weapons

How is a new era of great-power rivalry affecting America's nuclear security enterprise? Three national laboratories are tasked with keeping America's warheads safe, modernising them and even building new ones. And, unlike during the cold war, they have to do it all without conducting explosive tests. With political tensions on the rise around the world, the labs' mission has become more important than ever. This week, we investigate how the directors of the three labs are meeting this new moment. “The Bomb” is a four-part series which traces the scientific story of nuclear weapons. We go behind the scenes at America's nuclear-weapons laboratories to find out how the country is pushing the frontiers of extreme physics, materials science and computing to modernise its stockpile.  In episode four, we ask the people who manage the bombs what it's like to be responsible for such terrible and devastating weapons. Host: Alok Jha, The Economist's science and technology editor. Contributors: Thom Mason of the Los Alamos National Laboratory; Kim Budil of the Lawrence Livermore National Laboratory; and Laura McGill of Sandia National Laboratories. Thanks also to Jennifer Hayden of America's National Museum of Nuclear Science & History. Transcripts of our podcasts are available via economist.com/podcasts. Listen to what matters most, from global politics and business to science and technology—subscribe to Economist Podcasts+.