Tom was helping his little sister learn math. He told her, “You’ll do great at this problem,” and then helped guide her step by step. Afterwards, Tom felt she did better because of the way he encouraged her. But what if his encouragement actually changed how she thought about the problem? He expected her to succeed—and that expectation may have shaped her performance more than the help itself. Could his own hopes be influencing how well she did? Take the quiz to find out what’s really going on here.