To catch a liar, just ask them these two questions: a psychological technique that reveals contradictions

The principle behind this method is simple:   lying requires more mental effort than telling the truth  . When someone invents a story, they must remember the details they’ve just made up, maintain narrative coherence, and answer new questions without contradicting what they’ve already said. This process requires a greater level of concentration and memory than simply recounting what happened.

The first question some experts recommend is asking the person to   retell the story, but in reverse order  . For example, if someone is recounting what happened in a given situation, you could ask them to describe the events, starting at the end and working backwards step by step.