55% of how we communicate is through our body language.
So what are you giving off non-verbally that you don't realize?
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You can even figure out if someone is lying to you based on their non-verbal communication too.
For example, people not telling the truth tend to offer you a "fake smile" when they think they are showing you a genuine one.
Liars also like to overcompensate when they're lying, and so they'll often try to remain still and offer eye contact.
You can read more about body language including reading body language on a date and in a job interview by clicking here.