— By Robert Kravitz — What if electric hand dryers sometimes do more harm than good? The men’s room in a Chicago restaurant included a sign many of us have seen before in other restaurants, movie theaters and similar locations. Above the electric hand dryers were these words: “We hate them too. But they save trees and help us keep the restroom clean as well.” Signs like this will probably slowly disappear if for no other reason than customers have gotten used to seeing electric hand dryers in all …