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

Answer I just yawned...

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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

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