Good moods can be contagious. Humans often adopt the mood of fellow humans. Other mammals, and even some other non-mammalian vertebrates like parrots and zebrafish, do the same. For the first time, ...

Sure, we know that feelings are highly contagious, and being positive can help others around us to feel the same, but let’s be honest for a moment: sometimes life isn’t all rainbows. Some days aren’t ...