published on: 2015-05-22 10:11:08
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![4gifs: Yawning is contagious. [video]](http://64.media.tumblr.com/1556ffd3a143e1c88447fb58edeec270/tumblr_nomzlpOHzn1tlb56zo1_250.gif)
4gifs: Yawning is contagious. [video]