t happens all the time. Someone cooking on the stove or outdoor grill walks away to do something else, or falls asleep, or forgets about the food. And a fire starts. Cooking was the leading cause of residential fires in Virginia in 2008, according to a new state report that examines fires and responses to them. Cooking, which includes outdoor grilling, accounted for 31 percent of all residential structure fires, up from 28 percent in 2007, according to the 2009 annual report from the Virginia Department of Fire Programs. Heating-related fires were the next-most-common cause, at 16 percent. "Cooking is...