CHARLOTTESVILLE U.Va. student Jeff O’Dell, an Army soldier who has been at war, knows the value of body armor. “You live in that armor,“ the second-year biomedicaland mechanical-engineering student said. “You wear it like a T-shirt.“ Now O’Dell, with a team of three other University of Virginia second-year engineering students, is working on a new type of body armor that could save the lives of American soldiers.