If you own a dog, you’ve probably seen him yawn. A lot. And while a dog yawning is certainly adorable, you may have also wondered, “Why do dogs yawn so much?” Do they yawn for the same reason humans ...

A yawn is an involuntary reflex that involves opening the mouth wide and taking in a deep breath, followed by a slow exhale. Several theories exist about why we yawn, but researchers have not proven ...

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 ...

Have you ever realized how easily influenced we can be to yawn? Have you ever asked yourself why we yawn in the first place? Did you know that by just reading the word "yawn" you can trigger the need ...

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 ...

The most scientifically backed theory about why we yawn is brain temperature regulation. Inhaling air can help cool brain temperature down. Even thinking about yawning can cause you to do it. It’s ...

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 ...

Contagious yawning isn’t a myth. It’s a real, scientifically demonstrable phenomenon. We yawn when we see someone else yawn. The sound of yawning makes us yawn. The yawning contagion can even spread ...