While previous studies have suggested a connection between contagious yawning and empathy, new research from the Duke Center for Human Genome Variation finds that contagious yawning may decrease with age and is not strongly ...
The 4D scans of 15 healthy fetuses, by Durham and Lancaster Universities, also suggest that yawning is a developmental process which could potentially give doctors another index of a fetus' health.
You're more likely to respond to a yawn with another yawn when it comes from family member or a friend than from a stranger, says a study published Dec. 7 in the online journal PLoS ONE.
Though considered a mark of boredom or fatigue, yawning might also be a trait of the hot-headed. Literally.