Psychologist Gerd Gigerenzer has spent his career focusing on the ways in which we get things right, or could at least learn to. In Gigerenzer’s view, using heuristics, rules of thumb, and other shortcuts often leads to better decisions than the models of “rational” decision-making developed by mathematicians and statisticians. At times this belief has led the managing director of the Max Planck Institute for Human Development in Berlin into pretty fierce debates with his intellectual opponents. It has also led to a growing body of fascinating research, and a growing library of books for lay readers, the latest of which, Risk Savvy: How to Make Good Decisions, is just out.