Scientists aren't quite sure why we yawn, and even less certain of why it's so contagious. It's just an inexplicable compulsive behavior, like how some people feel the need to say, "I don't even own a TV," at the slightest provocation. But a new experiment has found that it's possible to alter the contagiousness of a yawn, and understanding how and why might be the key to addressing the symptoms of Tourette syndrome.
Don't Think of a Pink Elephant Yawning
Stopping Contagious Behavior
Why Is Yawning Contagious?
Key Facts In This Video
Yawning and stretching at the same time is called pandiculation. 00:29
People contagiously yawn less frequently when they have an ice pack on their heads, according to research. 01:51
Some penguins yawn to attract mates. 04:47
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