People tend to believe others. This phenomenon, referred to as the Truth Bias, allows society and commerce to run smoothly and efficiently. Absent the Truth Bias, people would spend an inordinate amount of time checking data collected from others. The Truth Bias also serves as a social default. Relationships with friends and business colleagues would become strained if their veracity were constantly questioned. Consequently, people typically believe others until evidence to the contrary surfaces. The Truth Bias provides liars with an advantage because people want to believe what they hear, see, or read. The Truth Bias diminishes when people become aware of the possibility of deception. The best defense against the Truth Bias is judicious skepticism.