While certain cues, like rubbing one's nose, may indicate that someone is lying, you can't automatically jump to that conclusion---the person you're talking to could be trying not to sneeze. But if someone's face and body are tense and she avoids making eye contact with you, keep your guard up.
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A person's nostrils can flare wider because her breathing might get deeper due to being nervous about making the lie she is telling sound true.
When your boss says, "I loved the tie you bought me" while he's wearing a tight smile that doesn't reach his eyes, don't expect to see him wearing it.
Anxiety from lying can increase your pulse, making you sweat or turn red.
A liar may unconsciously try to shield herself from the person she is talking to, perhaps moving to sit on the other side of a table or holding her hand in front of her face.
Like an animal in the wild who's trying to avoid detection, a liar may pull her arms and legs inward, or keep her movements to a minimum---anything to appear smaller.
A person may speak haltingly if her story isn't true, or pause a moment before she answers a question with a lie.
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