People who watch funny videos on the Internet at work aren’t necessarily wasting time. They may be taking advantage of the latest psychological science—putting themselves in a good mood so they can think more creatively.“Generally, positive mood has been found to enhance creative problem solving and flexible yet careful thinking,” says Ruby Nadler, a graduate student at the University of Western Ontario. She and her colleagues carried out a new study published in Psychological Science. For this study, Nadler and her colleagues looked at a particular kind of learning that is improved by creative thinking.Students who took part in the study were put into different moods and then given a category-learning task to do (they learned to classify sets of pictures with visually complex patterns). The researchers manipulated mood with help from music clips and video clips: first, they tried several materials to find out what made people happiest and saddest. The happiest music was a peppy Mozart piece, and the happiest video was of a laughing baby. The researchers then used these in the experiment, along with music and video provoking opposite feelings (a piece of music from Schindler’s List and a news report about an earthquake) and a piece of music and a video that didn’t affect mood. After listening to the music and watching the video, people had to try to learn to recognize a pattern.What is the finding of the study?A. Positive mood allows people to think more creatively.B. Listening to happy music is an easy way to be happy.C. People can work efficiently when they are listening to music.D. Happy volunteers solve problems more easily than others.