Wouldn’t it be interesting if, judging by someone’s face alone, could tell whether or not their smile was genuine? A person’s body language may give away some tell-tale signs, but is it really enough?

What if you could just look at someone and immediately decipher their smile? What if I told you it’d be impossible for them to deceive you or anyone else with a trained eye?

According to this snippet from a BBC documentary, the secret lies in fact that different parts of your brain control the ways you smile. After you’ve finished watching the 2 minute video below, you could always try the online test and let us know how you scored on our forums…

Think you’re ready to take the test? Try it by clicking here