My three young daughters like to watch pets doing silly things. Almost daily, they ask to see animal video clips on my phone and are quickly entertained. But once my 7-year-old lets out a belly laugh, ...

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Human laughter is such an intrinsic part of our lives that we don’t tend to give it much thought. But we are one of only a handful of animals that do it, along with apes, dogs, and, quite bizarrely, ...

My three young daughters like to watch pets doing silly things. Almost daily, they ask to see animal video clips on my phone and are quickly entertained. But once my 7-year-old lets out a belly laugh, ...