NEW ORLEANS - Scientists say a pill may help people overcome their worst phobias. In a small study released Monday, a drug already on the market for tuberculosis helped people who were terrified of heights get over that fear with only two therapy sessions instead of the usual seven or eight. The study, led by Michael Davis, a professor of psychiatry and behavioral sciences at the Emory University School of Medicine, was described at a session about unlearning fears at the Society for Neuroscience meeting. Davis based his work on research that had found the transmission of a certain protein...