Why is a small area of South Alabama home to such a high number of cases of a rare disease? In part one of our investigative report, we talked to two families who have never met, but have been affected by the deadly disease called ALS also called Lou Gehrig's disease, which attacks the muscles. The peaceful waters along the eastern shore are calm and tranquil. But could Mobile Bay, and the air and soil around it somehow be factors in the unusually high number of ALS cases? Susan Calhoun: " Here he is, he's worked all his life. He's...