Across the South and Midwest, survivors emerged Saturday to find blue sky and splinters where homes once stood, cars flung into buildings and communications crippled after dozens of tornadoes chainsawed through a region of millions, leveling small towns along the way. At least 38 people were killed in five states, but a 2-year-old girl was somehow found alive and alone in a field near her Indiana home. Her family did not survive. A couple that fled their home for the safety of a restaurant...