Dr. Kataria named "Laughter Yoga" as such was because he incorporated Pranayama, the ancient science of yogic breathing, into the laughter exercises. Laughter Yoga is therefore a form of Pranayahahama :-)
Practices such as Laughter Yoga and the Laughter Wellness method help you feel at peace and good about yourself in the present moment, for no particular reason. They give you the ability to laugh at things that previously would have caused stress or anger, along with the ability to experience a new sense of forgiveness.
This article details how people around the world are spreading its message of joy, health and world peace through laughter in a variety of projects that include Laughter Clubs, World Laughter Day, Universities of Joy, and more.
The difference between fun and laughter? You can have fun without laughing. Some people, sadly, can even laugh without having fun. To my knowledge, there are vast collections of studies about the healing powers of laughter and humor. But I still haven't found anyone researching the physiological, psychological or sociological benefits of fun.
According to a variety of surprisingly uninformed sources, there's at least a slim (or fat) chance that the apocalypse, currently scheduled for 2012, probably won't happen until 2013. This could be considered good news. I am nonetheless certain that for those who are around to have a retrospect it will do little to ameliorate the anticipated impact. That doesn't mean we should be any less prepared. Though it does raise the question: how, exactly, does one prepare for the apocalypse?