Researchers believe the yawning robot may have triggered some biological mechanism in the chimps that they associated with sleep. Image: Popular Science composite, Getty Images/ RMJM, Aline ...

Yawning seems like such a simple act, yet it holds surprising power over us. Just watching someone yawn — even a stranger — can suddenly trigger the irresistible urge to yawn yourself. Why does this ...

From a baby to an adult, and even animals, yawning is one of those things that most of us do multiple times a day, especially if we feel tired or bored. Fun fact: I have yawned at least three times ...

Yawning is contagious due to mirror neurons copying others' actions. Yawning helps cool the brain and keep it alert, not just signal tiredness. Contagious yawning is linked to empathy and social ...