Think about somebody yawning realllly big….. Did you just yawn also? Why?

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We do not fully know why people yawn, only that it is something common to a lot of animals. Mostly animals who live in family groups which suggest it is a primitive form of social interaction. There are theories that we yawn in order to get more oxygen into our blood or to cool down our body but this seams to have little effect if that is the case. So we do not know why yawning is so contagious that just thinking about it makes you want to do it.