“Netflix has more than 36 million subscribers. They watch about 4 billion hours of programs every quarter on more than 1,000 different devices. To meet this demand, the company uses specialized video servers scattered around the world. When a subscriber clicks on a movie to stream, Netflix determines within a split second which server containing that movie is closest to the user, then picks from dozens of versions of the video file, depending on the device the viewer is using. At company headquarters in Los Gatos, Calif., teams of mathematicians and designers study what people watch and build algorithms and interfaces to present them with the collection of videos that will keep them watching.” - × × ×