Why is Happy Addictive?

  The song Happy by Pharrell Williams has sold more than 650,000 copies, it is played on radio stations internationally on a regular basis and Pharrells many music videos based around this song have captured more than 160,000,000 views.  Happy has surpassed genre and generation by making fans out of a multitude of media listeners.  It doesn’t seem to matter what kind of music you listened to before, odds are you have done the...