There's a Civil War legend that dates back to April of 1862, in the aftermath of the Battle of Shiloh. Supposedly, when night fell on thousands of wounded soldiers stranded on the battlefield, something strange happened. Some of their wounds started to glow.  Stranger still, those with glowing wounds seemed to have better rates of survival. Stories of this so-called "Angel's Glow" have echoed through history. But it wasn't until 2001, when a teenage Civil War buff embarked on a science project, that anyone found any answers.