The document summarizes research on happiness. It discusses how psychologists, economists, and neuroscientists study happiness to understand what people feel, value, and experience. Key findings include that couples and healthy people tend to be happier than others. While smiles can serve strategic purposes, genuine smiles may promote longevity. Research also links happiness with productivity, motivation, and problem-solving. The talks explores what kinds of happiness people should pursue and whether this research will actually make people happier.