Yawning is a normal human reflex, but scientists are still not sure why it happens. Some people find that their eyes water when they yawn. This may be due to pressure on the tear glands or eye fatigue ...

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 ...

The average adult yawns 20 times per day. And when you feel a yawn coming on, it can be nearly impossible to suppress. But why does being around other yawners make you yawn? PBS NewsHour asked a ...

It’s ancient, unstoppable and strangely contagious. Here’s what science now knows about the humble yawn, and why evolution never got rid of it. You’re reading this sentence, and there’s a reasonable ...

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 ...

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 ...