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 ...

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 ...

It happened this past week -- a yawning gap in our knowledge filled at last. Humans do it ... chimps do it ... even educated dogs do it. We all do it: We all tend to start yawning when we see, or even ...

Even fetuses yawn, a new study shows. Subscribe to read this story ad-free Get unlimited access to ad-free articles and exclusive content. During the second and third trimester, fetuses yawn ...

Ever wonder why we yawn when we see someone else do it? Discover the science behind yawning and understand why it's so contagious. Yawning is an involuntary reflex that involves opening the mouth, ...

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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 ...