Yawn duration also correlates with the number of cortical neurons, according to a study.

Neuropsychologist Simon Thompson found a possible link between yawning and multiple sclerosis. So what better way to get under the skin of his research than volunteering to take part in one of his experiments?

In the absence of complex emotional bonds, humans and bonobos show similar empathy, according to a study.

A review of the new book Curious Behavior, which delves into the quirks of human conduct.

People who are emotionally connected are more likely to catch the yawns from one another.

Rather than fatigue or boredom, researchers propose that yawning may cool an overheated brain.