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 ...

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 ...

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 ...