(Volunteers work on a plastic roof cover of a damaged house after a tornado struck in Marysville, Ind., Saturday, March 3, 2012. Powerful tornadoes raked across a wide swath of the Midwest and South on Friday, killing at least 28 people in four states andbringing the death toll to at least 41 from a week of deadly late-winter storms. (AP Photo/Nam Y. Huh))
