This chapter discusses the concept of "the razor's edge" - the fine line that separates success from failure. It provides several examples where people achieved great success or earned significant rewards by making small improvements or efforts. These include a runner who won gold by 0.1 seconds, a horse that earned much more by often losing races by a "nose", and actors in a film who earned 75 times more than their stand-ins despite few tangible differences. The chapter encourages readers to find their own "razor's edge" - a small change that could lead to outsized results.