Have you ever found yourself starting to yawn just because you saw someone else do it? It’s not your imagination: Yawns really are contagious! In fact, humans can feel the urge to yawn after seeing, ...

Simply looking at the word can stimulate a yawn. I’m actually yawning while typing this piece. Interestingly, all vertebrates — a living being with a spinal column — yawn. Vertebrates include mammals, ...

The average adult yawns about 20 times a day. But why? Surely we can’t all be that tired. The truth is, the science behind yawning is more complex than just a few hours too little sleep. Even more ...

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 ...

Why do we yawn? Yawning is a universal gesture. Everyone yawns, from babies still in their mother's womb to the elderly. However, the exact reasons for this reflex are not well understood. Is it just ...

TIME’s new health column, It’s Not Just You, explores the phenomena behind some of life’s most everyday yet baffling behaviors. If seeing someone mid-yawn makes you involuntarily stretch out your ...

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 ...