For most of us, the internet is virtual, made of Instagram posts, emails and YouTube videos. And, access to the vital utility isn’t guaranteed across the world. Glad You Asked host Cleo Abram wants to know: What is the internet actually made of? And, how does it work? Answering that question involves discovering how internet cables are laid in the sea, if 5G is really the future, and how balloons in the stratosphere are helping people connect.