NEXT time you board a plane, consider visiting the restroom first. < snip > "For health reasons, we always hydrate thoroughly before and during flights," explained Roy M. Bohlin, a professor at California State University in Fresno. "With about an hour to go on the flight, our 9-year-old son needed to use the restroom and found it out of order." < snip > "Of course, our son was humiliated to have urinated in his pants and on the seat and was very uncomfortable for the rest of the trip," he said. < snip > Mr. Fink wonders about the health...