I read that yawning is contagious. Oh, honestly. As soon as I heard it I yawned. You all know yawning is an involuntary opening of the mouth and taking a long, deep breath of air. This is most often ...

Ever notice how you automatically yawn when someone else does it? That involuntary mouth-stretching moment isn’t just your brain being lazy. It’s actually broadcasting something pretty revealing about ...

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 ...

Science. Euphoria among dentists: anti-caries substance capable of repairing teeth created and product could be on the market next year Science. Forget everything we thought we knew about the end of ...

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 ...