Question

 Why always when someone yawns another one nearby also yawns, is it infectious, anybody can tell me.?

Answer I just yawned...
http://answers.yahoo.com/question/index?qid=20080220115949AAV2P3P

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How come if someone yawns near you and you see it, you yawn too?

my health teacher told us that people yawn because there is a lack of oxygen in the room, so if your friend yawns, then that means you both have the same lack of oxygen, hence you would yawn
http://answers.yahoo.com/question/index?qid=20081220110838AA5GiBs

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