times
The longer you yawn, the bigger your brain is. Scientists have linked yawning with the promotion of brain growth and activity. So on the other hand, if you have a smaller brain, you might be a quick yawner. Or, you could even be a psychopath, depending on how you yawn. People with psychopathic tendencies are less likely to fall victim to the contagious yawn because they lack empathy. (Photo: The Times UK)