ometimes life isn't as simple as heroes and villains. For Zelda, a 21-year-old Viking enthusiast who lives with her older brother, Gert, life is best lived with some basic rules: A smile means "thank you for doing something small that I liked." Fist bumps and dabs = respect Strange people are not appreciated in her home. Tomatoes must go in the middle of the sandwich and not get the bread wet. Sometimes the most important things...