It's a con­cept that had become uni­ver­sally under­stood: humans expe­ri­ence six basic emotions - happiness, sad­ness, anger, fear, dis­gust, and surprise - and use the same set of facial move­ments to express them. What's more, we can rec­og­nize emo­tions on another's face, whether that person hails from Boston or Borneo.