Every day we make decisions on topics ranging from the personal investments we select to the schools we pick for our children to the foods we eat to the causes we champion. Unfortunately, as authors Richard H. Thaler and Cass R. Sunstein astutely observe, we don t always choose well. The reason, the authors explain, is that we all are susceptible to cognitive biases and blunders that make us human, fallible, and prone to error.