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Why do people tend to yawn when they see others yawn?
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monkey-see monkey-do. Dr. Steven M. Platek has said that we yawn b/c we are unconciously imitating other humans. (probably some kind of evolution thing) I guess there are many other species that, cats...(i would totally pay to see a fish yawn!).. By the way although it used to be believed that it was to get more oxygen, this, however, is not true.
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bcoz when its boring our breating rate is highly reduced and the lungs push out the old content with a strong push hence it is contagious "BE AWARE OF IT IN CLASS ROOMS",OK.
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