The authors of these books use formulas to help readers understand and, thereby, take charge of their worlds. Conley (founder, Joie de Vivre Hospitality) offers what he terms "emotional equations" (e.g., joy equals love minus fear, and happiness equals wanting what you have divided by having what you want) to help identify and manage the elements that define life. He discusses such feelings as jealousy, regret, and despair in terms of their emotional components, so readers can get a clearer picture of a situation and cultivate a perfect "emotional potion." On the other hand, Markman (psychology & marketing, Univ. of Texas, Austin) suggests that the formula for smart thinking includes three parts: first, to have smart habits that, second, allow one to acquire high-quality knowledge and, third, the capacity to use that high-quality knowledge when needed. Markman shares tips and exercises for the development of smart thinking, such as breaking bad habits, paying attention, and strengthening memory. Both titles present interesting looks at common problems, but neither is extraordinary.