When the self-propelled torpedo was invented in the late 19th century, it threatened to revolutionize naval warfare. The weapon was instrumental in the wars of the 20th century, but also within the spheres of the global marketplace, government control and intellectual property. In this episode, Katherine Epstein, author of ‘Torpedo: Inventing the Military-Industrial Complex in the United States and Great Britain’, discusses the development of this lethal weapon in relation to military, legal and business history.