It takes a lot to run one of the world's largest companies , including a very early wake-up call. Apple CEO Tim Cook wakes up before dawn and starts his day by reading hundreds of feedback emails from customers before heading to the gym. Once he's at the office, he works long hours and leads famously lengthy meetings. His daily routine will likely change when he steps down as Apple's CEO . On Monday, Cook announced that John Ternus, Apple's senior vice president of hardware engineering, will