Yawn Contagion in Wolves

ENN
Aug 27, 2014, 5:15 pm25 pts
A yawn is defined as a reflex act of opening one's mouth and inhaling deeply. We yawn most often when we are tired or when we're bored. But we also always yawn when we see someone else doing it. Why? People say we can't help it - it's contagious! But what really triggers this involuntary tendency? According to…

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