Add Yahoo as a preferred source to see more of our stories on Google. Serena Williams of the U.S. bursts into laughter after a ball took an awkward spin in the first round match of the French Open ...

Can we infer someone's cultural group from their laugher, even when we do not know what they are laughing at? And what kind of laughter do we find most positive? A new study shows that our laughter ...

My husband, Don, likes to say that he needs to laugh every day (but only cry once or twice a year). I appreciate and admire his good nature, and I’m sure his ability to see the humor in life helps him ...

Few things can delight an adult more easily than the uninhibited, effervescent laughter of a baby. Yet baby laughter, a new study shows, differs from adult laughter in a key way: Babies laugh as they ...