Design and technology writer Andrew Blum was working away at his home in Brooklyn one day when his Internet connection was lost—something that happens to all of us more than we'd like to admit. It got him thinking: Where does the Internet come from? What does it look like? It lead to a 'round-the-world quest to find the tangible form of this ephemeral new infrastructure, and a book called Tubes: A Journey To The Center of the Internet. Blum discusses how he got to that "center, by following the paths of glass fiber-optic cables, carrying high velocity pulses of light underneath our streets and oceans.