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You can learn a lot by alayzing faces.

There are countless situations in life where we have to figure out how someone really feels, but they have a good poker face that keeps their feelings well-hidden. According to body language expert Terry Vaughan even the most deceptive people in the world have a tell: the left and right sides of their face don’t usually match.

So, which side do we believe? Vaughan says the left.

“The reason this is a powerful hack is because the left side of the face is more likely to reveal the ‘true emotion’ or the ‘dominant’ emotion if there’s a mix,” Vaughan says. The reason? “The right hemisphere of our brain does more heavy lifting in dealing with processing emotions. The left hemisphere…is a little more analytical or ‘strategic.’”

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