A very simple way to tell which of your mates is most likely to be a psychopath

Test this out.

Diversity is an important thing within your group of friends because nobody wants to have the same conversations with the same people over and over again. We all have a 'unique' character in our group of friends though. You know the type, they're usually that friend of yours that's a bit wilder and likes to push the boundaries in the search of a bit of fun. You might jokingly refer to them as a psycho but scientists have come up with a new way that can help you spot if someone is more likely to have psychopathic tendencies. Research that was published in the journal of Personality and Individual Differences has noted that people with more psychopathic are less likely to be affected by contagious yawning. The line of logic is that yawning has been strongly linked to empathy - a trait psychopaths lack. While this is pretty insightful, it doesn't categorically prove that people who don't follow your lead by yawning have something wrong with them but it's pretty interesting. I imagine that many of you will be putting this theory to the test with your mates very soon. Then again, you always had a suspicion about one of them! Hat-Tip to i100