Early on a Wednesday morning, I heard an anguished cry—then silence. I rushed into the bedroom and watched my wife, Rachel, stumble from the bathroom, doubled over, hugging herself in pain. "Something's wrong," she gasped. This scared me. Rachel's not the type to sound the alarm over every pinch or twinge. She cut her finger badly once, when we lived in Iowa City, and joked all the way to Mercy Hospital as the rag wrapped around the wound reddened with her blood. Once, hobbled by a training injury in the days before a marathon, she limped across the finish line anyway.