Once primarily a communication network, the Internet can now link a variety of physical devices and everyday objects, from cars and appliances to crucial medical equipment. Known as “the Internet of Things,” this system blurs distinctions between the virtual and the real, and, as DeNardis argues in this groundbreaking study, confers something tantamount to political power on whoever controls it. Showing how countries can use this cyber infrastructure to reach across physical boundaries, DeNardis, a professor in American University’s School of Communication and one of Slate’s 2016 Most Influential People in the Internet, lays out the threats it poses and offers policy prescriptions to protect our future. DeNardis is in conversation with Shane Harris, national security reporter for The Washington Post.