Rationality is the crowning achievement of our species. The ability to use evidence is true the cornerstone of science, medicine, and our legal system. We use rational methods, too, in daily life – we assess an applicant’s resume, a child’s IQ, or the mileage of a used car to predict the likelihood of good performance later on. Given that we often use information to make decisions both large and small, how good are we at assessing evidence?