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Why Is Yawning Contagious?
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Why Is Yawning Contagious?

Key Facts In This Video

  1. Yawning and stretching at the same time is called pandiculation. 00:29

  2. People contagiously yawn less frequently when they have an ice pack on their heads, according to research. 01:51

  3. Some penguins yawn to attract mates. 04:47

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