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  • We've all heard that yawning is contagious, so how long are you able to last while watching

  • this video? Once you've yawned, click here on the screen, or use the link in the description

  • below to see our video explaining why we yawn in the first place and why it's contagious.

  • Still here? There might actually be a reason why you didn't yawn at all. Make sure you

  • watch our other video, here, to find our why.

We've all heard that yawning is contagious, so how long are you able to last while watching

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B1 yawn contagious yawning explaining meter long

The Yawn-O-Meter (How Long Can You Last?)

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    林宜悉 posted on 2020/03/30
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