Riley Martin is a boy whose great curiosity takes him to a place he never imagined and a future that might seem impossible. But impossible is a word that doesn't exist for Riley. A second grader from El Paso, Texas, he lies in a high hospital bed in the original Shriners Burns Institute in Galveston. He has third-degree burns over 63 percent of his small body and face, the result of his experiment with gasoline from the lawn mower and a match. But...