The science of laughter – and why it also has a dark side

When you hear someone laugh behind you, you probably picture them on the phone or with a friend – smiling and experiencing a warm, fuzzy feeling inside. Chances are just the sound of the laughter could make you smile or even laugh along. But imagine that the person laughing is just walking around alone in the street, or sitting behind you at a funeral. Suddenly, it doesn’t seem so inviting.
Read more: http://theconversation.com/the-science-of-laughter-and-why-it-also-has-a-dark-side-76463?source=Snapzu