Humor has always been subjective. Where some people prefer the physical comedy of Jim Carrey, others may find the dry approach of Albert Brooks preferable. Babies, of course, are not big on subtlety.

Since 2012, I have been studying laughing babies. The question I am most often asked—frequently accompanied by incredulous laughter—is “Why?” And sometimes, “Wouldn’t it be better to study what makes ...

Few things are as heartwarming as hearing a baby's first laugh. I’ve experienced that moment with four children of my own, and that tiny, infectious sound isn’t just a special memory; it also marks a ...

In the video below, a boy tickles his little brother. At first, he smiles and giggles, but his peals of laughter quickly give way to howls of anguish. Jesse Graham, an up-and-coming psychologist (and ...

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