According to new research, acetaminophen (more commonly known as Tylenol) may relieve not only physical aches and pains but also the pain of hurt feelings and rejection. In one study of college students, scientists found that those who were given acetaminophen reported fewer hurt feelings and social pain than those who were given a placebo. And in a second study, researchers found that participants who took the over-the-counter pain reliever while playing a computer game designed to cause...