Is a Bad Mood Contagious? Une mauvaise humeur, est ce contagieux ?
When you see someone coughing, you reflexively know to steer clear of his or her germs. When you observe someone who is cranky or complaining, it is less obvious what to do. Studies suggest, however, that others’ moods may be as easy to catch as their germs.
See on www.scientificamerican.com