Meredith Grey (narration): Surgeons are scientists, trained to believe only in that which we can see and touch. But that training doesn't always take. Scientist or not, most of us who've been at this a while are forced to acknowledge the mysteries of life. We're forced to acknowledge that certain kinds of magic exist. And that history, and memory, and the ghosts of our past, are sometimes just as tangible as anything we can hold in our hands.