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, ...

We dare you not to crack a smile watching this girl laugh hysterically at her older sister! There is something so human and special when you hear a genuine uncontrollable laugh erupt. No one has a ...

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Have you ever burst into laughter when it was totally inappropriate? If not, consider yourself lucky. There is nothing more horrifying than losing control and laughing hysterically in the midst of an ...