Long before modern brain imaging technologies illuminated the neurophysiological mechanisms that make laughter contagious, William James (1842-1910) observed, "We don't laugh because we're happy, ...

Add Yahoo as a preferred source to see more of our stories on Google. Nothing is cuter and more heartwarming than listening to a baby or toddler laugh when tickled. Their laughter is contagious and ...

They say laughter is the best medicine but this video also proves its also pretty contagious. The Laughing Tram Man stood along side other travelers on a simple Monday morning and began to giggle. As ...

(PhysOrg.com) -- Laughter is almost universal. It’s an expression that is seen across all human cultures; babies begin to laugh within the first few months of life, and animals such as apes and even ...