Conceptsand Intuitions from Probability Theory Are Ubiquitous In Many Aspects of Our"Non-Mathematical" Lives. When We Decide Whether to Pay More For Acar That Is Reported to Be "More Reliable"; When We Choose Tosafeguard Our Children By Living In a "Low-Crime" Neighborhood; Whenwe Change Our Diet and Exercise Habits to Lower the Risk of Heart Disease; Whenwe Accept or Refuse a Job With Other Options Pending; All the Above Actionsinvolve Implicit Probability Judgments.