Smiling and laughter are important to good health. 

Recently, the following link has become my backup source for making me smile:

http://apod.nasa.gov/apod/ap080722.html

NASA showed a bit of whimsy when posting in July this video, "Happy People Dancing on Planet Earth" at the "Astronomy Picture of the Day" site.

The astronomer writes as part of the caption of this 4.5 minute video, "Happiness is frequently contagious -- few people are able to watch the above video without smiling." 

I agree. Can you imagine traveling around the world like this guy did, making so many people thoroughly enjoy living in that moment?

It makes me ponder what I can consider doing to make others not only laugh, but be happy in the moment.