Djordje Tujkovic began by outlining the Connectivity Lab at Facebook and its mission to connect the world. He then went deep into the underlying motivations, science, and challenges that come with providing fiber-like speeds wirelessly and how Facebook is tackling them with Terragraph. Using WiGig-based radios in the unlicensed 60 GHz spectrum is the starting point for Facebook to provide high-speed internet to dense urban areas. Terragraph had to overcome challenges in wireless signal propagation stemming from oxygen absorption in the atmosphere, changing weather conditions, and foliage and other street-level obstructions.