Every day, Sheryl carries four small reminders of her battle with cancer. She calls them her "radiation tattoos," but they're actually scars caused by the radiation machine. "I will eventually have them removed but it's a nice reminder," she says. "I want to remember every moment of what was going on at that time because we talk about defining moments, but I think nothing can define you. They're all refining moments. You're constantly refining yourself and refining your life."