Navarro also discusses the concept of micro-expressions, which are fleeting facial expressions that reveal our true emotions. These micro-expressions can occur in a matter of milliseconds, often unconsciously, and can betray our attempts to conceal our emotions. For instance, a person may flash a fake smile to hide their anxiety or fear, but their micro-expression may reveal a brief glimpse of their true emotional state. This phenomenon is often referred to as "emotional leakage," where our nonverbal cues betray our attempts to conceal our emotions.