Microexpressions are very short facial expressions that last half a second or less. They can reveal a person's true inner feelings. Successful leaders are able to spot microexpressions and understand body language codes to predict what someone is thinking or feeling. Leaders can also control their own microexpressions to appear confident when speaking or hide negative emotions. They can elicit microexpressions from others and adjust their conversation based on facial cues, such as a fruit seller who may be lying based on their microexpression of contempt. Microexpressions can be used in many domains like business, negotiation, and relationships.