It's a question you may, or may not have, thought about before: why do we have different laughs? And I don't mean just from each other! Sure, our laughs all differ from the sound of another persons, and this has largely to do with the formation of the parts of our mouths, and a number of other physical, genetic factors that we have no control over. But that's not all! Our laughs also differ based on the social situation we are in, how we we raised to be laugh, and the experiences that we have had. You know that a giggling three-year old is hard to quiet, but a fifty-year old who starts laughing might find it much easier to stop. Laughs, it seems, are not just based on genetics, but on ourseves! I found this video (see the second slide) of one man's interpretations of the many, many laughs we all know and have experienced! Laughter is not just an expression, but a social tool for interacting with those around us. How many laughs do you have? I have found myself doing many of the laughs he described, even though I don't want to admit it.